ToolQuarters

JSON Formatter & Validator

Paste messy JSON and get it cleanly indented in one click. Invalid JSON is flagged with a helpful error message so you can fix it fast. You can also minify JSON to a single line.

Runs in your browser — your files never leave your device

How to use JSON Formatter

  1. 1Paste your JSON into the input above.
  2. 2Choose an indent size, then click Format to beautify it.
  3. 3Use Minify to strip whitespace for production.
  4. 4Copy the result with the copy button.

Frequently asked questions

Does this validate my JSON?

Yes. If the JSON is invalid, you'll see the parser's error message pointing you to the problem.

Is my data uploaded?

Never. Parsing and formatting happen entirely in your browser.

What indent sizes are supported?

2 spaces, 4 spaces or tabs — plus a one-line minified option.