JSON Formatter & Validator
Beautify, minify and validate JSON in your browser.
About the JSON Formatter & Validator
The JSON Formatter and Validator turns messy, minified or hand-typed JSON into clean, readable, properly indented output — and tells you immediately if something is wrong. Beautify with 2 spaces, 4 spaces or tabs, minify down to a single line for production, or validate to catch syntax errors before they break your application. Your data never leaves your browser.
How to use it
- Paste your JSON into the input box.
- Click Beautify to indent it, Minify to compact it, or Validate to check it.
- Copy the result with one click.
Frequently asked questions
What does the validator detect?
It uses the browser's native JSON parser, so it catches missing commas, unquoted keys, trailing commas, mismatched brackets and other syntax errors with a precise message.
Will my JSON be uploaded?
No. Parsing and formatting happen locally in JavaScript, so sensitive data stays on your machine.
Why minify JSON?
Minified JSON removes whitespace to reduce file size, which speeds up API responses and saves bandwidth in production.
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