OpenToolkit

JSON Formatter

Developer

Format, validate and minify JSON.

Open JSON Formatter →

How to use

  1. Paste or type JSON into the editor.
  2. Click Format to pretty-print, or Minify to strip whitespace.
  3. Click Validate to check syntax; Copy or Download to save.

Features

  • Pretty-print with 2, 4 or 8-space indentation
  • Minify to a single line
  • Validation with error messages and a key count
  • Copy to clipboard or download as .json
🔒 Private by design — JSON Formatter runs entirely in your browser. Your files and text never leave your device.