Free Online JSON Formatter, Validator, Beautifier & Minifier
Paste messy or minified JSON below to beautify it with 2-space or 4-space indentation, validate syntax errors instantly, or compress it into a single minified line—100% locally in your browser.
How to Use This Free Tool in Seconds
- Paste your raw JSON string or API response into the input box.
- Click 'Format (2 Spaces)', 'Format (4 Spaces)', or 'Minify JSON'.
- If there is a syntax error, read the exact error message banner to fix missing commas or quotes.
- Copy the formatted JSON or download it as a `.json` file.
Frequently Asked Questions
Is it safe to paste production API responses or config files here?
Yes. Everything runs 100% locally inside your browser tab with zero network requests, so API keys and payloads never leave your machine.
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