ZippyToolkit

JSON Formatter & Validator

JSON Formatter makes JSON readable with proper indentation, checks that it is valid, and pinpoints the line and column of any syntax error. You can also minify JSON for production or sort keys alphabetically.

  • JSON → JSON
  • Runs in your browser
  • Free, no sign-up
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How to use JSON Formatter & Validator

  1. Paste JSON or drop a .json file.
  2. Click “Format”, “Minify” or “Validate”.
  3. If there is an error, the message shows its line and column.
  4. Copy or download the result.

Supported formats

InputJSON
OutputJSON
ProcessingOn your device, in the browser (no upload)

Limitations to know

  • Follows strict JSON (RFC 8259): comments, trailing commas and single quotes are reported as errors.
  • Numbers larger than 2^53 may lose precision when re-formatted, as in all JavaScript-based tools.

Privacy: JSON Formatter & Validator runs entirely in your web browser. Your JSON data is not uploaded, stored or shared, and nothing about its contents is sent to analytics.

Frequently asked questions

How do I find the error in invalid JSON?

Paste it and click “Validate”. The tool reports the exact line and column where parsing failed, and highlights that line.

Is it safe to paste API responses with tokens?

Yes. Nothing you paste is sent anywhere; formatting happens locally in your browser.