Online developer tool
Bring a little order to your JSON.
Validate, format or minify JSON with readable indentation. Large integer values are preserved exactly as entered.
Your JSON stays in this browser. Nothing is uploaded.Make your data easier to read
Paste JSON or import a file, then validate, format or minify it without changing numeric values.
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A focused workflow
Check the structure, choose a layout and take the result with you.
1. Add your JSON
Paste JSON or choose a JSON file.
2. Format or minify
Select indentation, then Format or Minify.
3. Save the result
Copy or download the validated result.
Common questions
Will large numbers be rounded?
No. Validation uses the browser JSON parser, while formatting preserves the original numeric text.
Can it fix invalid JSON?
It reports parsing errors. It does not silently change your data or accept comments and trailing commas.
How much JSON can I process?
Input is limited to 2 MB. Very deeply nested data may need to be minified instead of formatted to avoid excessively large output.