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JSON Formatter & Validator

Format, validate and minify JSON instantly.

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How to use this tool

  1. 1Paste your JSON into the input box on the left.
  2. 2Click "Format" for readable, indented output, or "Minify" for a compact single line.
  3. 3If the JSON is invalid, the exact parsing error is shown so you can fix it.

Frequently asked questions

Does this validate JSON or just format it?

Both — formatting only succeeds on valid JSON, and any syntax error is shown immediately.

Is my data sent to a server?

No, parsing and formatting run entirely in your browser using standard JSON methods.

What's the difference between Format and Minify?

Format adds line breaks and indentation for readability; Minify strips all unnecessary whitespace to reduce file size.