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.
Formatting, validating and minifying JSON
Pretty-printing JSON with consistent indentation makes it readable and reveals structure at a glance — essential when debugging API responses or config files. If the JSON is invalid, the parser points you to the problem so you can fix it fast.
Minifying does the opposite: it strips whitespace to the smallest valid form for production payloads. Both run entirely in your browser, so you can safely format sensitive data like tokens or private responses.
How to use JSON Formatter
- 1Paste your JSON into the input above.
- 2Choose an indent size, then click Format to beautify it.
- 3Use Minify to strip whitespace for production.
- 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.