JSON Formatter

Pretty-print or minify.

Theme

Private by design: This tool runs in your browser — your data is not uploaded.

How to use JSON Formatter

Paste minified API responses or config files and pretty-print with indentation — or minify JSON to one line.

Step-by-step

  1. Paste JSON in the text area.
  2. Choose Pretty or Minify.
  3. Fix any syntax errors shown, then copy output.

Common questions

Does this validate JSON?
Yes. Invalid JSON shows a parse error message.
Is my JSON uploaded?
No. Formatting runs locally in your browser.

Last updated: 2026-06-03