Developer Tools

Online developer tools let you validate, format, and inspect code and data without installing anything. They are useful for quick debugging, learning how a format works, checking a value before it goes into production code, or simply saving the time of spinning up a local script for a one-off task. Every tool below runs directly in your browser and works with real, functional logic — not a mockup.

JSON Formatter & Validator Format, validate, and minify JSON with instant error reporting. JSON Minifier Compress JSON by removing whitespace and line breaks. Regex Tester Test regular expressions against sample text with live match highlighting. JWT Decoder Decode JSON Web Tokens and inspect the header and payload. Hash Generator Generate SHA-256, SHA-384, and SHA-512 hashes from text. HTML Formatter Beautify and indent messy or minified HTML. CSS Formatter Beautify and indent minified or messy CSS. JavaScript Formatter Beautify minified or messy JavaScript code. HTTP Status Code Reference Searchable reference of HTTP status codes and their meanings. MIME Type Lookup Look up the MIME type for a file extension, or vice versa. User-Agent Parser Parse a User-Agent string into browser, OS, and device details.

Other Categories

Text Tools

Count words, compare text, convert case, and preview Markdown — practical utilities for writers, editors, and developers alike.

Converters

Convert between data formats and number systems — Base64, URL encoding, color formats, timestamps, JSON/CSV/XML/YAML, and binary/decimal/hex.

Generators

Generate UUIDs, passwords, random strings, QR codes, placeholder text, and boilerplate CSS or HTML snippets.