JSON Formatter & Validator
Format, beautify and validate JSON instantly, with the exact line and column of any syntax error.
Paste or type JSON above to format and validate it.
How it works
Paste JSON into the box and it is parsed, validated and pretty-printed instantly. If the JSON is invalid, the validator tells you the exact line and column where parsing failed plus what the parser expected — the fastest way to find a missing comma, a trailing comma or an unquoted key. Choose 2-space, 4-space or tab indentation, and optionally sort object keys alphabetically to make two payloads easy to compare. The status line reports the root type, how many keys the document contains, the maximum nesting depth and the formatted size.
Everything runs in your browser with the native JSON.parse and
JSON.stringify functions — your data is never uploaded, so it is safe for API
responses, tokens, config files and anything else confidential. Use Copy JSON or Download
.json to take the result with you.
Frequently asked questions
How do I format JSON online?
Paste your JSON into the box — it is parsed and pretty-printed as you type. Pick 2-space, 4-space or tab indentation, optionally sort the keys alphabetically, then use Copy JSON or Download .json to take the formatted result with you.
How do I find the error in invalid JSON?
When parsing fails, the validator shows "Invalid JSON at line X, column Y" together with what the parser expected, so you can jump straight to the missing comma, trailing comma, unquoted key or unclosed bracket. Fix it and the formatted output reappears immediately.
Is it safe to paste sensitive JSON into an online formatter?
With this one, yes: formatting and validation run entirely in your browser using the native JSON parser, so nothing is uploaded to a server. That makes it safe for API responses, access tokens and config files — many other online JSON tools send your payload to their backend.