Does it change my data?

No. It only reformats whitespace and indentation — keys, values, and ordering are preserved exactly.

Can it handle large JSON?

Yes, within your browser's memory. Very large files use more RAM since everything runs locally.

JSON formatter & validator

Paste JSON to reformat it with clean 2-space indentation, or catch the exact line and column of a syntax error. Runs entirely in your browser.

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What this JSON formatter does

It parses your JSON, verifies it is valid, and re-serialises it with consistent 2-space indentation so nested objects and arrays are easy to scan.

Why formatting matters

Minified or hand-edited JSON is hard to read and easy to break. Reformatting reveals structure and surfaces the exact spot where a comma or bracket is missing.

How errors are reported

If the JSON is invalid, the tool reports the line and column of the first problem instead of a vague failure, so you can jump straight to the fix.

Private by design

Your JSON is parsed in the browser with the native JSON engine. Nothing is uploaded, logged, or sent to a server.

How to json formatter

Paste or type your JSON into the input pane.
Click Convert to validate and pretty-print it.
If there's an error, read the reported line and column and fix it.
Copy the formatted result or download it as a .json file.

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