Private JSON formatter
Make JSON readable without changing the data.
Validate, format and minify JSON in your browser. Keep large numeric literals, key order and duplicate keys intact, then copy or download the result.
↳ Your browser. Your files.Free · No account · No uploads
Developer utilities / WORKSPACELOCAL PROCESSING
Strict JSON only. Numbers, key order and duplicate keys are preserved as written.
THREE SMALL STEPS
From input to done.
- Paste strict JSON into the input panel.
- Choose indentation, then format or minify. Syntax errors appear below the editor.
- Copy the result or download a JSON file. Your input remains on this device.
GOOD TO KNOW
A few useful answers.
Will a long numeric ID be rounded?
No. Formatting uses the original validated text tokens instead of reserializing JavaScript numbers. Numeric spellings, including large integers and exponent notation, remain intact.
Does this check my API schema?
It checks JSON syntax. It does not know which fields your application requires or whether their business meaning is correct.
Does it save my data?
No. The tool has no upload, account or saved history. Clear the editor or close the tab when you finish.