JSON Formatter & Validator
Pretty-print, minify and validate JSON with instant, precise error messages.
Processed on your device — nothing is uploaded
🔒 Parsed locally in your browser — safe even for tokens and private payloads.
About the JSON Formatter & Validator
The developer essential: paste messy JSON and get clean, readable output in your preferred indent style (2 spaces, 4 spaces or tabs) — or minify it for production payloads.
Invalid JSON? You get the exact error position immediately. Everything is processed locally, so API responses with tokens, keys or private data are safe to paste here.
How to use the JSON Formatter & Validator
- 1Paste your JSON into the input box.
- 2Choose Format (pretty-print) or Minify, and your indent style.
- 3Copy the result with one click.
Frequently asked questions
Is it safe to paste sensitive JSON?
Yes. Formatting happens in your browser only — nothing is transmitted or logged.
Where do I see syntax errors?
The result box shows the exact error message and position reported by the parser, so you can fix it fast.
How large can the JSON be?
Very large — the only limit is your browser's memory.
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