JSON Formatter & Validator

Beautify, minify and validate JSON instantly — right in your browser.

  • No upload
  • Browser-based
  • Free
  • No signup
  • Text

Runs in your browser. Your text never leaves your device.

Frequently asked questions

Is my JSON uploaded anywhere?
No. The JSON formatter runs entirely in your browser using the built-in JSON engine. Your data never leaves your device and nothing is sent to a server.
What does minify do?
Minify removes all whitespace and line breaks to produce the smallest valid JSON, which is useful for saving space or embedding JSON in code.
Why does it say my JSON is invalid?
The tool reports the exact line and column of the first syntax error. Common causes are trailing commas, single quotes instead of double quotes, or missing brackets.