JSON Formatter — Free Online, No Upload Needed
Validate, format, minify and inspect JSON with error messages and key stats.
Data & DevFreeNo uploadOffline-capable
Open the interactive json formatter tool — free, runs in your browser.
About this json formatter
Debug API responses and config files: paste minified or broken JSON to validate it, pretty-print it with indentation, minify it for production, or sort keys for stable diffs — with clear error messages pointing at the problem.
How to use
- Paste JSON.
- Click Format, Minify or Sort keys.
- Download the cleaned .json file if needed.
Common use cases
- Pretty-print a minified API response to debug a specific field.
- Validate a config file and locate the exact line with a syntax error.
- Minify JSON before shipping it in a bundle or embedding it in a request.
Every file is processed locally in your browser. Nothing is uploaded, logged or stored, and there is no account to create.
JSON Formatter FAQ
Is my JSON uploaded?
No. Parsing runs locally with JSON.parse.
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