JSON Formatter

Developers stare at JSON all day — API responses, config files, logs. This formatter pretty-prints, validates, and minifies JSON instantly, with helpful error messages when the syntax is wrong.

JSON Formatter saves you time and removes guesswork from everyday developer tools work. Validates syntax with line numbers — and because everything runs in your browser, your data stays private and results are instant.

• Validates syntax with line numbers
• Minify and pretty-print
• Handles huge payloads

1. Paste your JSON.
2. Click Format or Minify.
3. Copy the result.

{
  "user": {
    "id": 42,
    "name": "Ada",
    "active": true
  }
}

• • Debugging API responses
• • Reformatting config files
• • Cleaning up logs

• • Use 2-space indent for JS/TS, 4 for Python configs
• • Minify before embedding JSON in HTML
• • Always validate before shipping