Free Online JSON Formatter
Developers paste an API response here to read it; the error message points to the offending character instead of just saying Invalid JSON.
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How to use JSON Formatter
- Paste the JSON.
- Press Format, and set the indent if you need 2 or 4 spaces.
- Fix any reported error and re-run.
- Use Minify when the file has to ship.
Questions about JSON Formatter
Does it accept JSON Lines?
Yes, one object per line is detected and formatted as a sequence.
Why are my big numbers rounded?
JavaScript cannot hold them as integers; the tool keeps them as strings when Preserve large numbers is on.
About JSON Formatter
Format, validate and minify JSON instantly with our free online JSON Formatter. 100% browser-based, fast, and private—no login or file uploads required.
These text and code tools clean and transform strings: count words, convert case, deduplicate lines, encode or decode Base64 and URLs, escape entities, hash, format JSON and compare two versions.
This tool runs in your browser. The file is not uploaded. Everything runs on the text you paste, so you can safely process snippets of code or logs; nothing is sent anywhere, and clearing the box removes it from memory.