Articles, tutorials, and updates about developer tools and productivity.
Everything about JSON formatting: pretty-print vs minify, indentation standards, JSON5 and JSONC comments, common validation errors, sorting keys, and programmatic examples in JS and Python.
Learn how diff tools work: Myers algorithm, unified vs side-by-side output, line vs word vs character diff, YAML comparison, and practical use cases for config auditing, PR review, and debugging.
Learn how to resize images correctly: pixels vs percentage, aspect ratio locking, DPI vs PPI for print and screen, why upscaling degrades quality, and practical tips for web developers.
Learn how QR codes work: data types they encode, error correction levels (L/M/Q/H), size and format tradeoffs, and practical use cases — URLs, vCards, WiFi credentials, and 2FA setup.
Complete regex reference: quantifiers, character classes, anchors, groups, lookahead, lookbehind, named captures, flags, and 20+ ready-to-use patterns for email, URL, IP, date, and more.
Developers routinely paste JWT tokens, API keys, passwords, and database credentials into online tools that send them to servers. Learn why client-side processing matters and how to verify it yourself.
Master Linux file permissions: understand octal notation (755, 644, 777), symbolic mode (u+x, g-w), owner/group/others, special bits (setuid, sticky), and common real-world permission patterns.
Learn how JWT tokens work: decode the header and payload with Base64url, read standard claims (sub, exp, iat, iss), verify signatures, and debug tokens safely — with JavaScript and Node.js examples.
Transform your browser's new tab into a powerful developer tools hub with DevToys New Tab extension. Access essential dev tools instantly - JSON formatter, Base64 encoder, Hash generator, UUID, JWT decoder & more.
DevToys Web Pro is a modern collection of free online developer tools for formatting JSON, comparing text, testing regex, encoding Base64, generating UUIDs, and more — all in your browser.
Discover how DevToys Web Pro brings 32 essential developer tools into one fast, accessible platform for converters, encoders, formatters, generators, and more.
Master list operations: compare two lists, find duplicates, identify unique items, and perform set operations (union, intersection, difference). Practical guide with examples for developers.
Master number base conversion between hexadecimal, binary, octal, and decimal. Learn hex color codes, bitwise operations, memory addresses, and practical conversion techniques with examples.
Compare MD5, SHA-1, SHA-256, SHA-512, and BLAKE2 hashing algorithms. Learn speed vs security tradeoffs, when to use each algorithm, deprecated algorithms, and performance benchmarks for file integrity.
Learn when to use client-side vs server-side processing for file operations. Understand file size limits, privacy considerations, performance tradeoffs, and enterprise tools vs browser limitations.
Learn Quoted-Printable encoding for emails: MIME encoding rules, soft line breaks, when to use QP vs Base64, email compatibility. Practical guide with real examples for developers.
Learn when HTML entity encoding is required for security. Understand XSS prevention, JSON in HTML, attribute vs text encoding, and when escaping is optional. Practical guide with real examples.
Deep dive into URL encoding edge cases: space vs plus, percent encoding, and application/x-www-form-urlencoded vs RFC 3986. Learn how to debug broken query strings with practical examples.
Master image optimization with this comprehensive guide. Learn format selection (JPEG, PNG, WebP, AVIF), compression strategies, quality vs file size tradeoffs, and performance impact for web development.
Learn to design accessible interfaces for color blind users: understand protanopia, deuteranopia, and tritanopia, use color blindness simulators, create accessible palettes, and avoid common design mistakes.
Master WCAG color contrast requirements: understand AA (4.5:1) and AAA (7:1) ratios, test accessibility with contrast checkers, fix common failures, and design inclusive interfaces for all users.
Learn advanced GZip compression settings: compression levels (1-9), Deflate vs Zlib formats, streaming compression, and when to use server-side processing for optimal performance and file size.
Learn when to use server-side hash calculation for large files, bulk operations, and enterprise workflows. Understand MD5, SHA-256, SHA-512, and BLAKE2 performance for file integrity verification.
Learn about AVIF and HEIF image formats: compression efficiency, browser support, conversion workflows, and when to use modern image formats over JPEG and PNG for web performance.
Learn enterprise XML schema validation with XSD. Understand namespace handling, schema compliance, batch validation, and how to validate XML against XSD schemas for APIs and configurations.
Discover DevToys Web - a complete suite of free web developer tools accessible directly in your browser. 30+ utilities including JSON formatter, Base64 encoder, UUID generator, regex tester & more. No installation, works offline, privacy-focused.
Dev Toys is a swiss army knife for developers — 30+ free tools for formatting JSON, comparing text, testing regexp, encoding data, and more. No installation, runs in your browser, works offline.
Complete web data encoding workflow: URL encoding for query parameters, HTML entity escaping for display, and Quoted-Printable for email. Practical guide for web developers handling special characters.
Complete configuration management workflow: convert between YAML and JSON formats, validate syntax, and compare configuration versions to track changes. Practical guide for DevOps and developers.
Step-by-step workflow for debugging APIs: format messy JSON responses, extract data with JSONPath queries, and export results to CSV for analysis. Practical guide with real API examples.
Learn why JSON parsers reject trailing commas and comments, how to identify non-standard JSON in the wild, and common parsing issues when working with configuration files and APIs.
Learn the critical differences between hashing (MD5, SHA256), encryption, and password hashing. Understand when to use each, common mistakes, and best practices for file integrity and security.
Learn practical Base64 usage: data URLs for images, MIME type prefixes, embedding files in HTML/CSS, PDF encoding, and debugging common Base64 decode errors.
Learn how XML converts to JSON and back. Understand attribute mapping, text content (#text), array detection, namespaces, and how to predict XML↔JSON conversion output.
Learn about YAML implicit type conversion pitfalls. Understand how YAML parsers interpret yes/no, null values, leading zeros, and when to use quotes to prevent unexpected type coercion.
Learn the difference between well-formed XML and schema-valid XML. Understand what XML validators check, common validation errors, and how to validate XML against XSD schemas.
Learn how to decode X.509 certificates: Subject Alternative Names, Extended Key Usage, fingerprints, PEM vs DER formats. Understand certificate fields and validate SSL/TLS certificates.
Learn the differences between GZip, Deflate, and Zlib compression formats. Understand format headers, when tools fail, and how to choose the right compression format for your data.
Debug timestamp conversion issues between seconds and milliseconds. Learn Unix timestamp formats, timezone handling, and common pitfalls when working with epoch time in APIs.
Learn why JSON to CSV conversions often produce unexpected results. Covers nested objects, arrays, missing headers, and flattening strategies with practical solutions.
Complete JSONPath reference guide for API debugging: operators, filter expressions, array operations, and real-world query scenarios. Learn $.store.book[*], recursive descent, and advanced filtering.
Master cron syntax with practical examples: translate between human-readable schedules and cron expressions. Learn cron fields, wildcards, ranges, steps, and common patterns for backups, CI/CD, and automation.
Deep dive into regex newline handling: DotAll (s flag), Multiline (m flag), anchors, and common pitfalls. Learn pattern matching across lines, cross-language differences, and practical multiline regex patterns.
Essential guide to JSON string escaping: escape sequences, nested JSON, debugging double-encoded strings, and handling special characters. Fix common JSON syntax errors with practical examples.
Technical guide to essential data converters: JSON to YAML, XML to JSON, cron expression parser, timestamp converter, number base converter. Practical examples for real development workflows.
Technical guide to Base64 encoding, JWT decoding, URL encoding, HTML entities, GZip compression, certificate decoding, and QR codes. Practical examples for API debugging and data handling.
Technical guide to code formatting: JSON beautifier and minifier, SQL query formatter, XML prettifier. Best practices for formatting JSON, debugging minified code, and improving readability.
Technical guide to generators: UUID v1/v4/v6/v7, secure password generation, MD5/SHA256 hash checksums, and Lorem Ipsum. Practical examples for testing, security, and data integrity.
Technical guide to text tools: diff text comparison, list comparer, text analyzer, case converter, Markdown preview, and string escape utilities. Practical examples for code reviews and debugging.
Technical guide to testing tools: regex tester for pattern matching, JSONPath evaluator for JSON queries, XML validator for syntax checking. Practical examples with regex new line, multiline patterns, and more.
Technical guide to image tools: image compressor, resizer, format converter, color picker, hex to rgb converter, and color blindness simulator for accessibility testing. Optimize images for web performance.
