All Developer Tools
Browse all free developer utilities available on DevToolPlace.
AI Code Change Inspector
Compare original and AI-generated JavaScript, PHP or Laravel code, inspect review signals and build a focused regression test plan locally.
JSON to TOON Converter
Convert JSON into compact TOON-style notation for AI prompts, then convert TOON back to JSON.
URL Parser & Query Inspector
Inspect URL components and repeated query parameters using the browser URL parser, with an optional base for relative paths.
API Response Formatter
Beautify and analyze REST API JSON responses instantly.
Base64 Encoder
Convert text, JSON and API values into Base64 encoding instantly.
Base64 Decoder
Decode Base64 strings into readable text for API debugging and development.
URL Encoder / Decoder
Encode and decode URLs, query strings and special characters for web development.
Unix Timestamp Converter
Convert Unix timestamps, UTC dates and local times for logs, APIs and databases.
Color Converter
Convert HEX colors into RGB values for CSS and UI work.
XML Formatter
Beautify messy XML into readable, indented output.
UUID Generator
Generate secure UUID v4 identifiers for APIs, databases and test data.
Password Generator
Create strong random passwords with custom security options.
Lorem Ipsum Generator
Generate placeholder text for layouts, mockups and content testing.
Random Number Generator
Generate a random integer instantly for testing and mock data workflows.
Slug Generator
Create clean SEO-friendly URL slugs from any title or phrase.
HTML Formatter
Clean and format messy HTML code instantly.
HTML Viewer
Run and preview HTML code online.
HTML Entity Encoder
Encode special characters into safe HTML entities.
HTML Entity Decoder
Decode escaped HTML entities back into readable text.
JSON Validator
Validate JSON data online and find syntax issues before they break your API or application.
JSON String Escape & Unescape
Turn raw text into a valid JSON string literal, or decode a quoted JSON string without confusing it with HTML escaping.
CSV to JSON Converter
Convert comma-separated records into JSON objects while preserving quoted commas, multiline cells and leading zeros.
JSON Diff Checker
Compare two JSON documents by structure and inspect changed, added and removed values with JSON Pointer paths.
JSON Formatter
Format, beautify, validate, sort and minify JSON instantly for API debugging and development.
JSON to TypeScript Interface
Generate a starter TypeScript interface from JSON data for frontend development.
JSON to XML Converter
Convert JSON objects and arrays into XML output for integrations and testing.
JSON to CSV Converter
Convert JSON arrays of objects into clean CSV output for spreadsheets and reports.
JavaScript Minifier
Compress JavaScript snippets into smaller output.
CSS Minifier
Compress CSS code into smaller production-ready output.
Hash Generator
Generate hash values for text using common hashing algorithms.
JWT Toolkit
Decode, verify, generate and analyze JSON Web Tokens online.
JavaScript Regex Tester
Test JavaScript regular expressions against sample text and inspect matches, positions and capture groups in a worker.
Regex Tester
Test regular expressions against sample text and inspect matches instantly.
Text Case Converter
Convert text into common writing and developer naming cases.
XML Validator
Validate XML syntax and find parsing errors quickly.