JSON tools
Format, validate, minify, compare, convert, and query JSON without uploading it. Every tool on this page runs locally in your browser.
JSON Formatter & Beautifier
Format and beautify JSON online with adjustable indentation. Pretty-print API responses and fixtures while keeping your data in the browser.
JSON Validator
Validate JSON online and find syntax errors fast. Paste an API payload, config, or fixture and get the exact line and column, with nothing uploaded.
JSON Minifier
Minify JSON online by stripping whitespace and cutting payload size. See the size reduction instantly, and your data never leaves the browser.
JSON Diff Checker
Compare two JSON documents online and see added, removed, and changed fields side by side. Diff API responses and configs locally, with nothing uploaded.
JSON Converter — JSON to TypeScript, YAML & CSV
Convert JSON to TypeScript types, YAML, or CSV online. Paste a real API response and get a usable scaffold instantly, with nothing uploaded.
JSONPath Tester
Test JSONPath queries online against real JSON data and inspect every match. Built for debugging API responses, with all input processed locally.
Prefer a guided walkthrough? Read how to format and validate JSON online.