JSON Formatter
Format, beautify and validate JSON instantly in your browser. Pretty-print with indentation or minify — with clear error messages. Free.
Format JSON
Paste JSON to beautify, minify and validate it.
Features
Common use cases
- 1Reading a minified API response
- 2Validating a JSON config
- 3Debugging a syntax error
- 4Minifying JSON to save space
- 5Tidying hand-written JSON
- 6Formatting before committing
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About JSON formatting
JSON is the standard data format for APIs and configs, but it often arrives minified and unreadable, or with a syntax error that's hard to spot. Formatting reveals the structure; validating catches the mistake.
This tool beautifies JSON with your chosen indentation, minifies it back to one line, and reports the exact parse error when the JSON is invalid. Everything runs in your browser, so even sensitive payloads never leave your device.
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Got Questions? We Have Answers.
Does it validate my JSON?
Yes. Invalid JSON produces a clear error message pointing to the problem, so it works as a validator as well as a formatter.
Can it minify too?
Yes. You can pretty-print with 2 or 4 space indentation, or minify to a single compact line.
Is my data uploaded?
No. All parsing and formatting happens in your browser — your JSON never leaves your device.
Is there a size limit?
No hard limit, but very large documents depend on your browser memory. It handles typical API payloads and config files easily.