JSON Formatter
Parse JSON locally, pretty-print it with configurable indentation, and copy or download the formatted result.
Use JSON Formatter →Tool category
Developer Tools
Local browser utilities for structured data, encoding, regular expressions, IDs and source formatting.
This hub groups related utilities so visitors can solve a task without relying on search-result pages. Every linked tool has its own canonical page, explanatory content, and implementation notes.
Choose a utility, run the check or transformation, and follow the supporting guide when you need more context.
JSON Validator
Validate JSON locally and return a clear syntax error when parsing fails.
Use JSON Validator →URL Encoder and Decoder
Convert URL text with component-aware encoding and decoding using browser-standard APIs.
Use URL Encoder and Decoder →Base64 Encoder and Decoder
Convert UTF-8 text to Base64 and decode standard or URL-safe Base64 locally in the browser.
Use Base64 Encoder and Decoder →Regex Tester
Run a regular expression locally, inspect matches and groups, and experiment with common flags without executing server-side code.
Use Regex Tester →UUID Generator
Create UUID v4 values with cryptographically secure browser randomness where available.
Use UUID Generator →JWT Decoder
Decode JWT segments locally for inspection while clearly separating decoding from signature verification.
Use JWT Decoder →HTML Formatter
Format HTML-like text with safe indentation without executing the submitted markup.
Use HTML Formatter →CSS Minifier
Minify common CSS by removing unnecessary comments and whitespace while preserving strings and structural syntax.
Use CSS Minifier →JavaScript Minifier
Apply safe text-level JavaScript minification without executing the submitted code.
Use JavaScript Minifier →