# Peasy Dev > Developer tools made easy. Peasy Dev provides free browser-based tools at https://peasydev.com/. All processing happens client-side — files never leave your device. ## Tools (26) - [Hash Generator](https://peasydev.com/dev/hash-generator/) — Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes from text - [Password Generator](https://peasydev.com/dev/password-generator/) — Generate strong, random passwords - [Unix Timestamp Converter](https://peasydev.com/dev/timestamp-converter/) — Convert between Unix timestamps and human-readable dates - [Cron Expression Generator](https://peasydev.com/dev/cron-expression-generator/) — Build and understand cron schedule expressions - [Chmod Calculator](https://peasydev.com/dev/chmod-calculator/) — Convert between numeric and symbolic Unix file permissions - [String Escape / Unescape](https://peasydev.com/dev/string-escape-unescape/) — Escape and unescape strings for JSON, HTML, URL, XML, CSV, SQL - [IP Subnet Calculator](https://peasydev.com/dev/ip-subnet-calculator/) — Calculate subnet ranges, broadcast addresses, and CIDR notation - [Color Code Converter](https://peasydev.com/dev/color-converter/) — Convert colors between HEX, RGB, and HSL formats - [CSV ↔ JSON Converter](https://peasydev.com/dev/csv-json-converter/) — Convert between CSV and JSON formats - [XML ↔ JSON Converter](https://peasydev.com/dev/xml-json-converter/) — Convert between XML and JSON formats - [SQL Formatter](https://peasydev.com/dev/sql-formatter/) — Format and minify SQL queries - [Markdown Table Generator](https://peasydev.com/dev/markdown-table/) — Convert CSV/TSV data into formatted Markdown tables - [HTTP Status Code Reference](https://peasydev.com/dev/http-status/) — Look up HTTP status codes with descriptions and usage - [Meta Tags Generator](https://peasydev.com/dev/meta-tags/) — Generate HTML meta tags, Open Graph, and Twitter Card tags - [Robots.txt Generator](https://peasydev.com/dev/robots-txt/) — Create robots.txt files with AI crawler blocking options - [.gitignore Generator](https://peasydev.com/dev/gitignore/) — Generate .gitignore files for popular frameworks - [HTML Formatter](https://peasydev.com/dev/html-formatter/) — Beautify or minify HTML code with proper indentation - [CSS Unit Converter](https://peasydev.com/dev/css-units/) — Convert between px, rem, em, pt, %, vw, and vh - [JSONPath Evaluator](https://peasydev.com/dev/json-path/) — Query JSON data using JSONPath expressions - [Text Diff Checker](https://peasydev.com/dev/dev-text-diff/) — Compare two texts and highlight differences - [Data URI Converter](https://peasydev.com/dev/data-uri/) — Encode text to Data URIs or decode Data URIs to text - [Lorem Ipsum Generator](https://peasydev.com/dev/lorem/) — Generate placeholder text, code snippets, names, and emails - [Path Converter](https://peasydev.com/dev/backslash/) — Convert between Windows backslash and Unix forward-slash paths - [.htaccess Generator](https://peasydev.com/dev/htaccess/) — Generate Apache .htaccess rules for redirects, caching, and security - [.env Validator](https://peasydev.com/dev/env/) — Validate, sort, and compare .env environment files - [Placeholder Image Generator](https://peasydev.com/dev/placeholder/) — Generate placeholder image URLs for development and design ## Guides (140) - [Video Codecs Explained: H.264, H.265, VP9, and AV1](https://peasydev.com/guides/video-codecs-explained/) — Video codecs determine file size, quality, and compatibility. This guide compares the major codecs, from the ubiquitous H.264 to the … - [QR Code Generation: Best Practices for Print and Digital](https://peasydev.com/guides/qr-code-generation-best-practices/) — QR codes bridge physical and digital experiences, but poorly generated codes fail to scan. This guide covers sizing, error correction, … - [JSON vs YAML vs TOML: Choosing a Configuration Format](https://peasydev.com/guides/json-vs-yaml-vs-toml/) — Configuration files are the backbone of modern applications. JSON, YAML, and TOML each offer different trade-offs between readability, complexity, and … - [QR Code Design Best Practices: Balancing Aesthetics and Scannability](https://peasydev.com/guides/qr-code-design-best-practices/) — A QR code that looks great but fails to scan is worse than useless. Understanding the relationship between visual customization … - [QR Codes for Restaurant Menus: Implementation Guide](https://peasydev.com/guides/qr-codes-restaurant-menus/) — Contactless menus via QR codes became standard during the pandemic and remain popular for cost savings and easy updates. Implementing … - [Two-Factor Authentication Methods Compared: TOTP, SMS, and Hardware Keys](https://peasydev.com/guides/two-factor-authentication-methods-compared/) — Compare the security, convenience, and cost of major 2FA methods including authenticator apps, SMS codes, hardware security keys, and biometrics. … - [Audio Bitrate and Quality: Finding the Right Balance](https://peasydev.com/guides/audio-bitrate-quality-guide/) — Bitrate determines both file size and audio quality in lossy formats. Understanding the relationship between bitrate, codec efficiency, and perceptual … - [Regex Cheat Sheet: Essential Patterns for Text Processing](https://peasydev.com/guides/regex-cheat-sheet-essential-patterns/) — A practical regular expression reference covering the most commonly needed patterns for text processing. Includes email validation, URL matching, date … - [Text Encoding Explained: UTF-8, ASCII, Latin-1, and Unicode](https://peasydev.com/guides/text-encoding-utf8-ascii-unicode-explained/) — Demystify character encoding — why text appears as garbled symbols, how UTF-8 became the universal standard, and practical strategies for … - [CSS Custom Properties (Variables): A Complete Guide](https://peasydev.com/guides/css-custom-properties-variables-complete-guide/) — Master CSS custom properties — from basic variable usage to advanced patterns like theming, component APIs, and responsive design tokens. … - [Video Codec Comparison: H.264 vs H.265 vs VP9 vs AV1](https://peasydev.com/guides/video-codec-comparison-h264-h265-vp9-av1/) — Four dominant video codecs compete for web delivery and streaming. Each balances compression efficiency, encoding speed, and browser support differently. … - [Structured Data Implementation: Schema.org for SEO](https://peasydev.com/guides/structured-data-schema-org-guide/) — Structured data helps search engines understand your content semantically, enabling rich results like stars, prices, FAQs, and recipe cards in … - [Video Compression for Web: Reducing File Size Without Losing Quality](https://peasydev.com/guides/video-compression-web-delivery/) — Large video files slow page loads and consume bandwidth. Effective compression balances visual quality with file size using the right … - [QR Code Content Generation Patterns and Best Practices](https://peasydev.com/guides/qr-code-content-generation-patterns/) — QR codes can encode URLs, contact cards, Wi-Fi credentials, and more. Each content type follows a specific format that scanning … - [API Response Formats: JSON vs XML vs Protocol Buffers](https://peasydev.com/guides/api-response-formats-json-xml-protobuf/) — Choosing the right serialization format affects API performance, developer experience, and client compatibility. JSON dominates the web, but XML and … - [Environment Variable Management: Security and Best Practices](https://peasydev.com/guides/environment-variable-management-guide/) — Environment variables separate configuration from code, keeping secrets out of version control. Mismanaging them leads to leaked API keys, broken … - [Regex Pattern Generation and Testing Guide](https://peasydev.com/guides/regex-pattern-generation-testing/) — Regular expressions are powerful but notoriously hard to write correctly. This guide covers common patterns, testing strategies, and tools that … - [Structured Data and Schema.org: A Practical Guide](https://peasydev.com/guides/structured-data-schema-org/) — Structured data helps search engines understand your content and can generate rich results like star ratings, FAQs, and product cards. … - [How to Format and Validate JSON Data](https://peasydev.com/guides/format-validate-json/) — Malformed JSON causes silent failures in APIs and configuration files. Learn how to format, validate, and debug JSON documents to … - [CSV vs JSON vs XML: Data Exchange Formats Compared](https://peasydev.com/guides/csv-vs-json-vs-xml/) — Data exchange formats serve different needs. CSV excels at tabular data, JSON dominates web APIs, and XML powers enterprise integrations. … - [Regular Expressions: A Practical Guide for Text Processing](https://peasydev.com/guides/regex-practical-guide/) — Regular expressions are powerful patterns for searching, matching, and transforming text. This guide covers the most useful regex patterns with … - [How to Trim and Edit Audio Files in the Browser](https://peasydev.com/guides/trim-edit-audio-browser/) — Browser-based audio editing lets you trim silence, cut sections, and adjust audio without installing software. Learn how to use the … - [Unit Conversion Best Practices for Developers](https://peasydev.com/guides/unit-conversion-best-practices/) — Incorrect unit conversions have caused spacecraft crashes and medical errors. This guide covers best practices for implementing unit conversions in … - [QR Code vs Barcode: When to Use Each](https://peasydev.com/guides/qr-code-vs-barcode/) — QR codes and traditional barcodes serve different purposes. This comparison covers data capacity, scanning requirements, and optimal use cases to … - [How to Create QR Codes for Wi-Fi Networks](https://peasydev.com/guides/create-wifi-qr-codes/) — Wi-Fi QR codes let guests connect to your network instantly by scanning with their phone camera. This guide covers the … - [How to Generate Color Palettes Programmatically](https://peasydev.com/guides/generate-color-palettes/) — Algorithmic color palette generation creates harmonious color schemes from a single base color. Learn the math behind complementary, analogous, and … - [How to Add Logos and Branding to QR Codes](https://peasydev.com/guides/add-logos-branding-qr-codes/) — Branded QR codes with logos increase scan rates and reinforce brand identity. Learn how to customize QR codes with logos, … - [How to Convert Case and Clean Up Messy Text](https://peasydev.com/guides/convert-case-clean-text/) — Messy text with inconsistent capitalization, extra whitespace, and mixed formatting is a common problem. This guide covers tools and techniques … - [Matrix Operations: A Visual Guide for Developers](https://peasydev.com/guides/matrix-operations-visual-guide/) — Matrices are fundamental to graphics, machine learning, and data processing. This guide explains matrix addition, multiplication, transposition, and inversion with … - [Troubleshooting CSS Specificity Conflicts](https://peasydev.com/guides/troubleshooting-css-specificity/) — When CSS rules unexpectedly override each other, specificity is usually the culprit. This guide explains how specificity is calculated and … - [Troubleshooting QR Code Scanning Problems](https://peasydev.com/guides/troubleshooting-qr-scanning/) — QR codes that fail to scan frustrate users and waste printing costs. This guide helps you diagnose and fix the … - [Troubleshooting JWT Token Issues](https://peasydev.com/guides/troubleshooting-jwt-tokens/) — JSON Web Tokens are widely used for authentication but can be frustrating to debug. This guide covers common JWT problems … - [Two-Factor Authentication Methods: TOTP, WebAuthn, and SMS](https://peasydev.com/guides/two-factor-authentication-methods/) — Two-factor authentication (2FA) adds a critical layer of security beyond passwords. This guide compares TOTP apps, hardware security keys, SMS … - [Dynamic QR Codes vs Static QR Codes](https://peasydev.com/guides/dynamic-vs-static-qr-codes/) — Static QR codes encode data permanently, while dynamic QR codes use redirect URLs that can be updated after printing. Understanding … - [How to Find and Replace Text Using Regular Expressions](https://peasydev.com/guides/how-to-find-replace-regex/) — Regular expressions enable powerful pattern-based find and replace operations. Learn practical regex patterns for common text transformation tasks. - [QR Code Size and Resolution Guide](https://peasydev.com/guides/qr-code-size-resolution-guide/) — Determine the optimal size and resolution for QR codes based on scanning distance, print medium, and content complexity. - [How to Debug JWT Tokens Step by Step](https://peasydev.com/guides/how-to-debug-jwt-tokens/) — JWT tokens contain encoded claims that can be decoded and inspected. Learn how to decode, verify, and troubleshoot JWT authentication … - [How to Format and Validate JSON Data](https://peasydev.com/guides/how-to-format-validate-json/) — Minified JSON is unreadable and errors are hard to find. Learn how to pretty-print, validate, and transform JSON for debugging … - [How to Create vCard QR Codes](https://peasydev.com/guides/how-to-create-vcard-qr-codes/) — Generate QR codes that instantly add contact information to smartphones, with proper vCard formatting and testing. - [UUID vs CUID vs NanoID: Choosing an ID Generator](https://peasydev.com/guides/uuid-vs-cuid-vs-nanoid/) — Compare UUID, CUID, NanoID and other ID generation strategies for databases, APIs, and distributed systems. - [How to Generate Test Data for Development](https://peasydev.com/guides/how-to-generate-test-data/) — Create realistic fake data for testing databases, APIs, and user interfaces without exposing real user information. - [Barcode Types Compared: 1D vs 2D](https://peasydev.com/guides/barcode-types-1d-vs-2d-compared/) — Compare 1D barcodes (UPC, EAN, Code 128) with 2D codes (QR, Data Matrix, PDF417) for different use cases. - [H.264 vs H.265 vs AV1: Video Codec Comparison](https://peasydev.com/guides/h264-vs-h265-vs-av1-comparison/) — Video codecs determine compression efficiency, quality, and compatibility. Compare the three dominant codecs for streaming and distribution. - [How to Encode and Decode Base64 Data](https://peasydev.com/guides/how-to-encode-decode-base64/) — Base64 converts binary data to ASCII text for safe transmission. Learn how Base64 encoding works and its common uses in … - [QR Code Security and Phishing Prevention](https://peasydev.com/guides/qr-code-security-phishing-prevention/) — Protect against QR code phishing attacks and implement secure QR code practices for businesses and consumers. - [How to Convert Between Number Systems (Binary, Hex, Octal)](https://peasydev.com/guides/how-to-convert-number-systems/) — Developers regularly work with binary, hexadecimal, and octal numbers. Learn conversion techniques and when each number system is used. - [Troubleshooting QR Code Printing Issues](https://peasydev.com/guides/troubleshooting-qr-code-printing/) — Fix QR codes that won't scan after printing, including resolution, contrast, and sizing problems. - [Slug Generation and URL-Safe String Best Practices](https://peasydev.com/guides/slug-generation-url-safe-strings/) — Generate clean, SEO-friendly URL slugs from titles and names, handling Unicode, transliteration, and edge cases. - [REST API Testing: Best Practices for Developers](https://peasydev.com/guides/rest-api-testing-best-practices/) — Testing APIs thoroughly prevents bugs and ensures reliability. Learn strategies for testing endpoints, handling edge cases, and validating responses. - [How to Generate Barcodes for Products](https://peasydev.com/guides/how-to-generate-product-barcodes/) — Create UPC, EAN, and ISBN barcodes for retail products, including registration, formatting, and printing requirements. - [Troubleshooting File Format Conversion Errors](https://peasydev.com/guides/troubleshooting-format-conversion-errors/) — Diagnose and fix common file conversion failures including codec errors, corruption, and compatibility issues. - [QR Code Analytics and Tracking](https://peasydev.com/guides/qr-code-analytics-tracking/) — Track QR code scans with UTM parameters, dynamic redirects, and analytics platforms for marketing campaigns. - [Text Diff and Comparison: Finding Changes Between Versions](https://peasydev.com/guides/text-diff-comparison-guide/) — Comparing text versions reveals exactly what changed. Learn how diff algorithms work and how to use them for code review, … - [JSON vs XML vs Protocol Buffers: Data Serialization Compared](https://peasydev.com/guides/json-vs-xml-vs-protobuf/) — Choosing the right data serialization format affects performance, readability, and development speed. Compare JSON, XML, and Protocol Buffers for your … - [How to Generate QR Codes with Custom Designs](https://peasydev.com/guides/how-to-generate-custom-qr-codes/) — Create branded QR codes with custom colors, logos, and patterns while maintaining reliable scannability. - [CSS Performance Optimization Best Practices](https://peasydev.com/guides/css-performance-optimization/) — CSS affects page rendering speed more than developers realize. Learn how to reduce render-blocking, optimize selectors, and minimize layout thrashing. - [Troubleshooting Barcode Scanner Compatibility](https://peasydev.com/guides/troubleshooting-barcode-scanner-compatibility/) — Fix barcode scanning failures across different scanner types, symbologies, and environments. - [Video Format Containers vs Codecs: What's the Difference?](https://peasydev.com/guides/video-containers-vs-codecs-explained/) — MP4, MKV, and WebM are containers; H.264, H.265, and VP9 are codecs. Understanding this distinction is essential for video conversion … - [Troubleshooting Video Export and Rendering Errors](https://peasydev.com/guides/troubleshooting-video-export-rendering-errors/) — Fix common video export failures including codec errors, audio sync issues, and rendering crashes. - [QR Code Error Correction Levels Explained](https://peasydev.com/guides/qr-error-correction-levels-explained/) — Learn how QR code error correction works and when to use each level for optimal scanning reliability. - [QR Codes for Restaurant Menus: Implementation Guide](https://peasydev.com/guides/qr-codes-restaurant-menus-guide/) — QR code menus became standard during the pandemic. Learn how to implement them effectively, avoid common usability pitfalls, and provide … - [QR Code Error Correction Levels: Choosing the Right One](https://peasydev.com/guides/qr-code-error-correction-levels/) — QR codes can be partially damaged and still scan successfully. Learn how error correction works, when to use each level, … - [How to Extract and Transform Structured Data from Text](https://peasydev.com/guides/how-to-extract-structured-data-from-text/) — Parse emails, addresses, phone numbers, dates, and URLs from unstructured text using regex and pattern matching. - [How to Convert Between Video Containers and Codecs](https://peasydev.com/guides/how-to-convert-video-containers-codecs/) — Understand the relationship between video containers (MP4, MKV, WebM) and codecs (H.264, H.265, VP9) for proper conversion. - [QR Code vs NFC Tags: Which to Use](https://peasydev.com/guides/qr-code-vs-nfc-tags-comparison/) — Compare QR codes and NFC tags for contactless interactions, covering cost, range, and use cases. - [URL Encoding Best Practices for Web Developers](https://peasydev.com/guides/url-encoding-best-practices/) — Proper URL encoding prevents broken links and security vulnerabilities. Learn which characters must be encoded and how to handle international … - [Troubleshooting QR Codes That Won't Scan](https://peasydev.com/guides/troubleshooting-qr-codes-wont-scan/) — Diagnose and fix common QR code scanning failures including size, contrast, and encoding issues. - [Video Encoding Settings for Web Delivery](https://peasydev.com/guides/video-encoding-settings-web-delivery/) — Optimize video encoding with the right codec, bitrate, and container settings for web playback. - [Dynamic QR Codes: When and How to Use Them](https://peasydev.com/guides/dynamic-qr-codes-when-how-to-use/) — Understand dynamic QR codes that allow destination changes without reprinting the physical code. - [How to Validate and Format Data Formats](https://peasydev.com/guides/how-to-validate-format-data-formats/) — Validate JSON, XML, YAML, and CSV data for structural correctness and format them for readability. - [CSS Architecture: BEM, SMACSS, and ITCSS Compared](https://peasydev.com/guides/css-architecture-bem-smacss-itcss/) — Large CSS codebases become unmaintainable without architecture. Compare the three most popular CSS methodologies and learn which suits your project. - [How to Debug API Requests and Responses](https://peasydev.com/guides/how-to-debug-api-requests-responses/) — Inspect HTTP headers, request bodies, response codes, and timing to diagnose API integration issues. - [Fixing Video Playback Issues in Browsers](https://peasydev.com/guides/fixing-video-playback-issues-browsers/) — Troubleshoot common HTML5 video playback problems including codec errors, autoplay blocks, and CORS. - [Advanced Regex Patterns for Log File Analysis](https://peasydev.com/guides/advanced-regex-log-analysis/) — Log files contain critical diagnostic information buried in semi-structured text. Master regex patterns to extract timestamps, error codes, IP addresses, … - [Barcode Formats Compared: Code 128 vs Code 39 vs EAN](https://peasydev.com/guides/barcode-formats-code128-code39-ean-comparison/) — Compare popular 1D barcode formats for density, character support, and industry requirements. - [Unicode Normalization: NFC, NFD, NFKC, NFKD Explained](https://peasydev.com/guides/unicode-normalization-forms-explained/) — The same visible character can have multiple Unicode representations. Learn when and how to normalize text to prevent comparison failures … - [QR Code Design: Branding Without Breaking Scannability](https://peasydev.com/guides/qr-code-branding-design-scannability/) — Design branded QR codes with custom colors, logos, and shapes while maintaining reliable scanning. - [Text Diff and Merge Tools Compared](https://peasydev.com/guides/text-diff-merge-tools-compared/) — Compare text comparison tools for code review, document editing, and content management. - [SVG Optimization and Best Practices](https://peasydev.com/guides/svg-optimization-best-practices/) — Optimize SVG files for web performance by removing unnecessary elements, minifying code, and choosing the right export settings. - [Regular Expressions: Pattern Matching Essentials](https://peasydev.com/guides/regular-expressions-pattern-matching-essentials/) — Master fundamental regex patterns for text search, validation, and transformation tasks. - [How to Generate Secure API Keys](https://peasydev.com/guides/how-to-generate-secure-api-keys/) — Create cryptographically secure API keys with proper entropy, formatting, and management practices. - [How to Design RESTful API URL Structures](https://peasydev.com/guides/how-to-design-restful-api-urls/) — Well-designed API URLs are intuitive, consistent, and follow REST conventions. Learn patterns for resource naming, versioning, filtering, and pagination. - [YAML vs JSON vs TOML for Configuration Files](https://peasydev.com/guides/yaml-vs-json-vs-toml-configuration/) — Compare configuration file formats for developer tools, CI/CD pipelines, and application settings. - [Git Hooks for Automated Code Quality](https://peasydev.com/guides/git-hooks-automated-code-quality/) — Git hooks run scripts automatically before or after Git events. Set up pre-commit hooks for linting, formatting, and testing to … - [Environment Variable Management Best Practices](https://peasydev.com/guides/environment-variable-management-best-practices/) — Environment variables separate configuration from code, enabling the same application to run in development, staging, and production. Learn secure patterns … - [API Testing and Debugging with Developer Tools](https://peasydev.com/guides/api-testing-debugging-developer-tools/) — Test REST APIs effectively using browser DevTools, curl, and dedicated API testing tools. - [QR Codes for Healthcare: Patient Safety and Medication Tracking](https://peasydev.com/guides/qr-codes-healthcare-medication-tracking/) — Healthcare facilities use QR codes on patient wristbands, medication packaging, and equipment to reduce errors and improve traceability. Learn the … - [HTTP Status Codes: A Developer's Quick Reference](https://peasydev.com/guides/http-status-codes-quick-reference/) — Choosing the right HTTP status code communicates your API's intent clearly. Learn when to use each status code family and … - [QR Code Tracking and Analytics: Measuring Scan Performance](https://peasydev.com/guides/qr-code-tracking-analytics/) — Without analytics, QR codes are a black box — you know they exist but not whether anyone scans them. Tracking … - [Barcode Symbology Comparison: EAN, UPC, Code 128, and More](https://peasydev.com/guides/barcode-symbology-comparison/) — Different barcode formats serve different purposes — retail products use EAN/UPC, shipping uses Code 128, and healthcare uses DataMatrix. Choosing … - [API Rate Limiting: Strategies and Implementation](https://peasydev.com/guides/api-rate-limiting-strategies/) — Rate limiting protects APIs from abuse and ensures fair resource allocation. Learn common algorithms, response headers, and client-side handling strategies. - [QR Codes for Business Cards: Creating Digital vCards](https://peasydev.com/guides/qr-codes-business-cards-vcards/) — A QR code on a business card lets recipients save contact information with a single scan instead of manual typing. … - [Video Container vs Codec: Understanding MP4, WebM, AVI, and MKV](https://peasydev.com/guides/video-container-vs-codec-mp4-webm-avi-mkv/) — Demystify the relationship between video containers and codecs. Learn why changing a file extension does not convert video, and how … - [Comparing QR Code Error Correction Levels](https://peasydev.com/guides/comparing-qr-code-error-correction-levels/) — QR codes use Reed-Solomon error correction to remain scannable even when partially damaged or obscured. This comparison explains the four … - [WiFi QR Codes: Connecting Guests Without Sharing Passwords](https://peasydev.com/guides/wifi-qr-codes-guest-networks/) — WiFi QR codes let guests connect to a network with a single scan, eliminating the need to dictate complex passwords. … - [Event Ticket QR Codes: Generation, Validation, and Security](https://peasydev.com/guides/event-ticket-qr-codes-guide/) — QR codes on event tickets must balance ease of scanning with resistance to duplication and fraud. A well-designed ticket QR … - [Text Diff and Merge: Understanding Algorithms and Tools](https://peasydev.com/guides/text-diff-merge-algorithms-tools/) — Understand how diff algorithms work, the differences between line-based and word-based diffs, and best practices for three-way merging. Essential knowledge … - [Payment QR Codes: Standards, Platforms, and Implementation](https://peasydev.com/guides/payment-qr-codes-guide/) — QR-based payments are the dominant payment method in China, India, and Southeast Asia, and are growing rapidly in Western markets. … - [How to Convert Between Number Systems (Binary, Hex, Octal)](https://peasydev.com/guides/how-to-convert-between-number-systems/) — Understanding binary, hexadecimal, and octal number systems is fundamental for developers and anyone working with low-level data. This guide explains … - [Search and Replace Power Techniques for Text Processing](https://peasydev.com/guides/search-replace-power-techniques/) — Advanced search and replace techniques using regex capture groups, lookaheads, and conditional replacements. Transform text data efficiently with patterns that … - [QR Codes in Education: Classroom and Campus Applications](https://peasydev.com/guides/qr-codes-education-classroom-campus/) — QR codes streamline classroom workflows, campus navigation, and student engagement. From linking printed worksheets to digital resources to contactless attendance … - [Data Serialization Formats: JSON, YAML, TOML, XML, and Protocol Buffers](https://peasydev.com/guides/data-serialization-json-yaml-toml-xml-protobuf/) — Compare data serialization formats for configuration files, API responses, and inter-service communication. Understand parsing performance, human readability, and schema validation … - [String Manipulation Best Practices for Developers](https://peasydev.com/guides/string-manipulation-best-practices/) — Best practices for common string operations — trimming, padding, case conversion, truncation, and escaping. Covers Unicode-aware handling and the subtle … - [QR Code Size and Scanning Distance: A Practical Reference](https://peasydev.com/guides/qr-code-size-scanning-distance/) — A QR code that scans perfectly on a business card may be unreadable on a billboard. The relationship between code … - [Audio Compression for Streaming: Optimizing for Bandwidth](https://peasydev.com/guides/audio-compression-streaming-optimization/) — Streaming audio over the internet requires balancing quality against bandwidth consumption and latency. Codec selection, bitrate adaptation, and buffering strategy … - [Barcode Inventory Management: Setup and Best Practices](https://peasydev.com/guides/barcode-inventory-management-guide/) — Barcode-based inventory management reduces counting errors by 67% compared to manual entry. Setting up an effective system requires choosing the … - [QR Codes for Product Packaging: Design and Compliance](https://peasydev.com/guides/qr-codes-product-packaging/) — QR codes on product packaging bridge the physical-digital gap, linking to instructions, authentication, warranty registration, and marketing content. Packaging constraints … - [JSON Formatting and Validation: Best Practices for Clean Data](https://peasydev.com/guides/json-formatting-validation-best-practices/) — Best practices for formatting, validating, and structuring JSON data. Covers indentation standards, JSON Schema validation, common syntax errors, and the … - [XML vs JSON: When to Use Each and How to Convert Between Them](https://peasydev.com/guides/xml-vs-json-comparison-conversion/) — Compare XML and JSON across use cases, tooling, and data modeling capabilities. Learn when each format is the better choice … - [Custom QR Code Logos: Embedding Brand Identity Safely](https://peasydev.com/guides/custom-qr-code-logos-guide/) — Embedding a logo in the center of a QR code reinforces brand identity but risks scan failures if done incorrectly. … - [Base64 Encoding: How It Works, When to Use It, and Common Pitfalls](https://peasydev.com/guides/base64-encoding-guide-common-pitfalls/) — Understand Base64 encoding — the mechanism behind data URIs, email attachments, and API payloads. Learn when Base64 is appropriate, when … - [Batch QR Code Generation: Techniques for Large-Scale Creation](https://peasydev.com/guides/batch-qr-code-generation-guide/) — Generating hundreds or thousands of unique QR codes for events, inventory, or marketing campaigns requires automation. Batch generation combines template … - [Database Export Formats: SQL, CSV, JSON, and Parquet](https://peasydev.com/guides/database-export-formats-sql-csv-json-parquet/) — Choose the right export format for database migrations, analytics, and data sharing. Understand the tradeoffs between portability, performance, schema preservation, … - [Random Data Generation for Software Testing](https://peasydev.com/guides/random-data-generation-testing/) — Generating realistic random test data improves code coverage and catches edge cases that manual test data misses. This guide covers … - [CSS Cascade Layers: Managing Specificity at Scale](https://peasydev.com/guides/css-cascade-layers-managing-specificity/) — Learn CSS cascade layers (`@layer`) — the solution to specificity wars in large codebases. Control which styles override others regardless … - [QR Code Security: Risks, Attacks, and Mitigation Strategies](https://peasydev.com/guides/qr-code-security-considerations/) — QR codes are inherently trusted by users — most people scan without hesitation. This trust creates attack vectors including phishing, … - [Log File Format Troubleshooting: Parsing JSON, Syslog, and Custom Formats](https://peasydev.com/guides/log-file-format-troubleshooting-guide/) — Troubleshoot common log file parsing issues. Covers multiline log entries, timestamp format variations, character encoding problems, and strategies for parsing … - [Language Detection: How It Works and Its Limitations](https://peasydev.com/guides/language-detection-how-it-works-limitations/) — Understand the algorithms behind automatic language detection — n-gram frequency analysis, Unicode script detection, and machine learning approaches. Learn the … - [Micro QR Codes and Small-Format Alternatives](https://peasydev.com/guides/micro-qr-codes-small-format/) — When standard QR codes are too large for the available space, micro QR codes and other compact formats offer alternatives. … - [Trigonometry Basics for Developers and Designers](https://peasydev.com/guides/trigonometry-basics-for-developers/) — Trigonometric functions power animations, game physics, audio visualization, and SVG path generation. This guide covers sin, cos, and tan with … - [Scroll-Driven Animations: Triggering CSS Animations on Scroll](https://peasydev.com/guides/scroll-driven-animations-css-guide/) — Learn the new CSS Scroll-Driven Animations API — trigger animations based on scroll position without JavaScript. Covers scroll() and view() … - [Video Format Conversion Guide: MP4, WebM, MOV, and AVI](https://peasydev.com/guides/video-format-conversion-mp4-webm-mov/) — Different platforms and devices require different video formats. Understanding container formats and their codec compatibility prevents quality loss during conversion. - [Data Matrix vs QR Code: Choosing the Right 2D Barcode](https://peasydev.com/guides/data-matrix-vs-qr-code-comparison/) — Data Matrix and QR codes are the two dominant 2D barcode formats, each optimized for different use cases. Understanding their … - [API Mock Data Generation for Frontend Development](https://peasydev.com/guides/api-mock-data-generation/) — Frontend developers often need to work before the backend API is ready. Mock data generators create realistic API responses that … - [Best Practices for Handling Sensitive Data in the Browser](https://peasydev.com/guides/handling-sensitive-data-browser-best-practices/) — Guidelines for safely processing passwords, keys, and personal data in client-side JavaScript. Covers memory handling, clipboard security, and preventing data … - [Troubleshooting QR Code Scan Failures: Diagnosis and Fixes](https://peasydev.com/guides/troubleshooting-qr-code-scan-failures/) — When a QR code fails to scan, the cause is usually one of five common issues: insufficient contrast, inadequate size, … - [CAD File Formats: DXF, DWG, STEP, and IGES for Non-Engineers](https://peasydev.com/guides/cad-file-formats-dxf-dwg-step-iges/) — A practical guide to CAD file formats for developers, designers, and project managers who need to work with engineering files. … - [Certificate and Key Generation Basics for Developers](https://peasydev.com/guides/certificate-key-generation-basics/) — SSL/TLS certificates, SSH keys, and API signing keys are essential for secure communication. This guide explains the types of keys, … - [Brand Color Consistency: Maintaining Colors Across Digital and Print](https://peasydev.com/guides/brand-color-consistency-across-media/) — The same hex code can look different on a monitor, a phone screen, and a printed brochure. This guide explains … - [Slug and URL-Safe String Generation Best Practices](https://peasydev.com/guides/slug-url-safe-string-generation/) — Slugs transform human-readable titles into URL-safe strings. Proper slug generation handles unicode, special characters, and collisions while preserving readability. - [Git Hooks for Code Quality: Pre-Commit, Pre-Push, and Beyond](https://peasydev.com/guides/git-hooks-code-quality-guide/) — Git hooks automate code quality checks at commit and push time, catching issues before they enter the codebase. This guide … - [Technical SEO Audit Checklist for Web Developers](https://peasydev.com/guides/technical-seo-audit-checklist/) — A technical SEO audit identifies crawlability, indexability, and performance issues that prevent search engines from properly ranking your site. This … - [Timestamp and Date Generation Utilities for Developers](https://peasydev.com/guides/timestamp-date-generation-utilities/) — Timestamps are the backbone of logging, scheduling, and data synchronization. This guide covers Unix timestamps, ISO 8601, and generating dates … - [CI/CD Pipeline Setup: From Code Push to Production Deploy](https://peasydev.com/guides/ci-cd-pipeline-setup-guide/) — A well-designed CI/CD pipeline catches bugs early, enforces code quality, and deploys with confidence. This guide walks through building a … - [Time Zone Math and Date Calculations Explained](https://peasydev.com/guides/time-zone-math-date-calculations/) — Time zone conversions, daylight saving transitions, and date arithmetic are notoriously error-prone. This guide covers the rules and edge cases … - [JWT Token Generation and Structure Explained](https://peasydev.com/guides/jwt-token-generation-structure/) — JSON Web Tokens (JWT) are the standard for stateless authentication. Understanding their structure, signing algorithms, and security considerations prevents common … - [Code Formatting Tools Compared: Prettier vs ESLint vs Biome](https://peasydev.com/guides/code-formatting-prettier-eslint-biome/) — Consistent code formatting eliminates style debates and reduces diff noise in code reviews. Prettier, ESLint, and Biome take different approaches … - [Design Handoff Best Practices: From Figma to Production](https://peasydev.com/guides/design-handoff-best-practices/) — Poor design handoff causes miscommunication, wasted developer time, and pixel-imperfect implementations. A structured handoff process bridges the gap between design … - [Developer Productivity CLI Tools You Should Know](https://peasydev.com/guides/developer-productivity-cli-tools/) — The command line remains the most efficient interface for many developer tasks. Modern CLI tools offer dramatic speed improvements, better … - [Troubleshooting Video Playback: Codec Errors, Black Screens, and Audio Sync](https://peasydev.com/guides/troubleshooting-video-playback-issues/) — Video playback problems — black screens, no audio, stuttering, or sync issues — usually stem from codec incompatibilities or corrupted … ## Glossary (65 terms) - [12-Factor App](https://peasydev.com/glossary/12-factor-app/) — A methodology of twelve best practices for building scalable, maintainable software-as-a-service applications. - [API Gateway](https://peasydev.com/glossary/api-gateway/) — A server that acts as a single entry point for API requests, handling routing, authentication, … - [AST](https://peasydev.com/glossary/ast/) — A tree representation of the syntactic structure of source code, used by compilers and code … - [Backpressure](https://peasydev.com/glossary/backpressure/) — A flow control mechanism where a slow consumer signals a fast producer to reduce its … - [Base58](https://peasydev.com/glossary/base58/) — A binary-to-text encoding that excludes visually ambiguous characters (0, O, I, l), used in Bitcoin … - [Canary Release](https://peasydev.com/glossary/canary-release/) — A deployment strategy that routes a small percentage of traffic to a new version to … - [CI/CD](https://peasydev.com/glossary/cicd/) — A development practice where code changes are automatically built, tested, and deployed to production. - [CIDR](https://peasydev.com/glossary/cidr/) — A notation for IP address ranges using a base address and prefix length (e.g. 192.168.1.0/24). - [Content Negotiation](https://peasydev.com/glossary/content-negotiation/) — A mechanism where the client and server agree on the best representation of a resource … - [CORS Preflight](https://peasydev.com/glossary/cors-preflight/) — An automatic OPTIONS request sent by browsers before cross-origin requests to check server permissions. - [Cron Expression](https://peasydev.com/glossary/cron-expression/) — A string format representing a schedule using five fields: minute, hour, day, month, and day … - [Dead Letter Queue](https://peasydev.com/glossary/dead-letter-queue/) — A message queue that stores messages that could not be processed successfully, enabling later inspection … - [Debounce](https://peasydev.com/glossary/debounce/) — Delaying a function execution until a specified time has passed since the last invocation. - [Diff Algorithm](https://peasydev.com/glossary/diff-algorithm/) — An algorithm (e.g. Myers, patience) that computes the minimal set of changes between two sequences … - [DNS](https://peasydev.com/glossary/dns/) — The hierarchical naming system that translates human-readable domain names into IP addresses. - [Docker](https://peasydev.com/glossary/docker/) — A platform for building, shipping, and running applications in lightweight, isolated containers that share the … - [Edge Computing](https://peasydev.com/glossary/edge-computing/) — Processing data closer to the user at network edge locations to reduce latency and bandwidth … - [Endian Swap](https://peasydev.com/glossary/endian-swap/) — Reversing the byte order of a multi-byte value, converting between big-endian and little-endian formats. - [Environment Variable](https://peasydev.com/glossary/environment-variable/) — A key-value pair set in the operating system environment, used to configure application behavior. - [Epoch Time](https://peasydev.com/glossary/epoch-time/) — The number of seconds elapsed since January 1, 1970 UTC, used as a universal time … - [ETag](https://peasydev.com/glossary/etag/) — An HTTP header providing a unique identifier for a specific version of a resource, used … - [Feature Flag](https://peasydev.com/glossary/feature-flag/) — A configuration switch that enables or disables features at runtime without deploying new code, used … - [Glob Pattern](https://peasydev.com/glossary/glob-pattern/) — A wildcard syntax for matching file paths using characters like * (any) and ? (single … - [GraphQL](https://peasydev.com/glossary/graphql/) — A query language for APIs that lets clients request exactly the data they need in … - [gRPC](https://peasydev.com/glossary/grpc/) — A high-performance RPC framework using HTTP/2 and Protocol Buffers for efficient service-to-service communication. - [Hex Encoding](https://peasydev.com/glossary/hex-encoding/) — Representing binary data as a string of hexadecimal (base-16) characters, using digits 0-9 and letters … - [HTTP Status Code](https://peasydev.com/glossary/http-status-code/) — A three-digit code indicating the result of an HTTP request (e.g. 200 OK, 404 Not … - [Idempotent](https://peasydev.com/glossary/idempotent/) — An operation that produces the same result regardless of how many times it is applied. - [ISO 8601](https://peasydev.com/glossary/iso-8601/) — An international standard for date and time representation (e.g. 2026-03-08T14:30:00Z). - [JQ](https://peasydev.com/glossary/jq/) — A lightweight command-line tool for filtering, transforming, and querying JSON data using a concise syntax. - [JSON Lines](https://peasydev.com/glossary/json-lines/) — A text format where each line is a valid JSON value, designed for streaming and … - [JSON Patch](https://peasydev.com/glossary/json-patch/) — A format for describing a sequence of operations to modify a JSON document (add, remove, … - [JSON Schema](https://peasydev.com/glossary/json-schema/) — A vocabulary for annotating and validating the structure, types, and constraints of JSON documents. - [Kubernetes](https://peasydev.com/glossary/kubernetes/) — An open-source system for automating deployment, scaling, and management of containerized applications across clusters. - [Microservices](https://peasydev.com/glossary/microservices/) — A design pattern where an application is composed of small, independently deployable services communicating via … - [Monorepo](https://peasydev.com/glossary/monorepo/) — A version control strategy where multiple projects or packages are stored in a single repository, … - [OAuth 2.0](https://peasydev.com/glossary/oauth-20/) — An authorization protocol allowing third-party applications to access resources on behalf of a user without … - [OpenAPI](https://peasydev.com/glossary/openapi/) — A standard for describing RESTful APIs in a machine-readable format (formerly known as Swagger). - [Polyfill](https://peasydev.com/glossary/polyfill/) — JavaScript code that implements a modern API on older browsers that lack native support, enabling … - [Protocol Buffers](https://peasydev.com/glossary/protocol-buffers/) — A language-neutral binary serialization format by Google, more compact and faster than JSON or XML. - [Rate Limiting](https://peasydev.com/glossary/rate-limiting/) — Restricting the number of API requests a client can make within a given time window. - [REST](https://peasydev.com/glossary/rest/) — An architectural style for web APIs using standard HTTP methods to access and manipulate resources. - [RFC](https://peasydev.com/glossary/rfc/) — A publication by internet standards bodies like the IETF that defines protocols, procedures, and conventions … - [Semver](https://peasydev.com/glossary/semver/) — A versioning scheme using MAJOR.MINOR.PATCH format to communicate the nature of changes in software. - [Serverless](https://peasydev.com/glossary/serverless/) — A cloud execution model where the provider manages server infrastructure and scales automatically per request. - [Service Worker](https://peasydev.com/glossary/service-worker/) — A browser script running in the background that enables offline caching, push notifications, and network … - [Shebang](https://peasydev.com/glossary/shebang/) — The #! characters at the start of a script file specifying which interpreter should execute … - [Source Map](https://peasydev.com/glossary/source-map/) — A file mapping minified or transpiled code back to the original source, enabling readable stack … - [SQL](https://peasydev.com/glossary/sql/) — A language for managing and querying relational databases using statements like SELECT, INSERT, and UPDATE. - [SSE](https://peasydev.com/glossary/sse/) — A standard allowing servers to push real-time updates to the browser over a single HTTP … - [STDIN](https://peasydev.com/glossary/stdin/) — The default input stream for a program, typically connected to the keyboard or piped from … - [Terraform](https://peasydev.com/glossary/terraform/) — An infrastructure-as-code tool that defines cloud resources in declarative configuration files for reproducible deployments. - [Throttle](https://peasydev.com/glossary/throttle/) — Limiting a function to execute at most once per specified time interval, regardless of how … - [TOML](https://peasydev.com/glossary/toml/) — A configuration file format designed to be easy to read and map to a dictionary … - [Tree Shaking](https://peasydev.com/glossary/tree-shaking/) — A build optimization that removes unused exports from JavaScript modules, reducing the final bundle size. - [Type Coercion](https://peasydev.com/glossary/type-coercion/) — The automatic or implicit conversion of a value from one data type to another (e.g. … - [URI](https://peasydev.com/glossary/uri/) — A string that identifies a resource, encompassing both URLs (locators) and URNs (names). - [UUID](https://peasydev.com/glossary/uuid/) — A 128-bit identifier guaranteed to be unique across space and time, formatted as a 36-character … - [WASM](https://peasydev.com/glossary/wasm/) — A binary instruction format enabling near-native performance for code running in web browsers. - [Webhook](https://peasydev.com/glossary/webhook/) — An HTTP callback that automatically sends data to a specified URL when a specific event … - [WebSocket](https://peasydev.com/glossary/websocket/) — A communication protocol providing full-duplex, persistent connections between a client and server over a single … - [Web Worker](https://peasydev.com/glossary/web-worker/) — A JavaScript execution context running in a background thread, enabling CPU-intensive tasks without blocking the … - [XML](https://peasydev.com/glossary/xml/) — A markup language for encoding structured data in a format readable by both humans and … - [XPath](https://peasydev.com/glossary/xpath/) — A query language for selecting nodes from an XML document using path expressions. - [XSLT](https://peasydev.com/glossary/xslt/) — A language for transforming XML documents into other formats such as HTML, text, or different … ## API Base URL: https://peasydev.com/api/v1/ | Endpoint | Description | |----------|-------------| | GET /api/v1/tools/ | List all tools (filterable by category) | | GET /api/v1/tools/{slug}/ | Tool detail with description, steps, FAQ | | GET /api/v1/categories/ | Tool categories | | GET /api/v1/formats/ | File formats reference | | GET /api/v1/conversions/ | Format conversion guides | | GET /api/v1/glossary/ | Terminology definitions | | GET /api/v1/glossary/{slug}/ | Term with simple + technical explanations, code examples, references | | GET /api/v1/guides/ | Educational guides (filterable by category, audience_level) | | GET /api/v1/guides/{slug}/ | Full guide with content, takeaways, ToC, related guides | | GET /api/v1/use-cases/ | Real-world use cases | | GET /api/v1/search/?q={query} | Cross-model search | | GET /api/v1/sites/ | All 16 Peasy sites | OpenAPI spec: https://peasydev.com/api/openapi.json Swagger UI: https://peasydev.com/api/docs/ ## Content Negotiation All pages support Markdown output for AI agents: - Add `?format=md` to any page URL - Or send `Accept: text/markdown` header ## Platform Stats - 251 tools across 16 sites - 131 file formats documented - 1484 format conversion guides - 695 glossary terms - 645 educational guides - 302 real-world use cases Full catalog: https://peasydev.com/llms-full.txt