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JSON Formatter & Validator

Paste JSON to beautify it, find syntax errors with their line number, or minify it.

No upload — stays on your device Instant Free · no sign-up · no watermark

Quick answer: Paste your JSON and tap Format / Validate. Valid JSON is pretty-printed; invalid JSON shows the error and the line and column where it occurs.

How to use the JSON Formatter & Validator

  1. Paste JSON.
  2. Tap Format / Validate or Minify.
  3. Copy or download the result.

Frequently asked questions

Are my files uploaded to a server?

No. Everything happens inside your browser using your own device. Files are never uploaded, stored or seen by anyone — you can even switch off the internet after the page loads and the tool keeps working.