Formateur JSON

Format, validate and syntax-highlight JSON online, free. Paste JSON to auto-format with error line numbers and indentation options.

Comment utiliser Formateur JSON

  1. Paste or upload your JSON.
  2. Click "Format" to beautify and validate it.
  3. Copy or download the formatted result, or explore it in tree view.

Questions fréquentes

Does it validate my JSON?

Yes, invalid JSON is flagged so you can fix syntax errors quickly.

Is my data uploaded anywhere?

No. Formatting happens entirely in your browser; your JSON never leaves your device.

Outils associés

Minifier JSON Visionneuse JSON Comparer JSON