JSON Formatter & Validator
Format, beautify and validate JSON in your browser. Free and private — your data is never uploaded.
JSON formatter, validator & minifier
Paste JSON to beautify it with 2-space, 4-space or tab indentation, or minify it to a single line. Invalid JSON shows a clear error message with the position of the problem. Ideal for developers working with APIs and config files — nothing leaves your browser.
How to format and validate JSON online
- Paste your JSON into the editor above.
- Click Format to beautify and indent it instantly.
- Any syntax errors are highlighted so you can fix invalid JSON.
- Copy the clean JSON. Your data never leaves your browser.
Frequently asked questions
Is my JSON uploaded to a server?
No. Formatting and validation run entirely in your browser, so sensitive data stays private.
Can it tell me why my JSON is invalid?
Yes. The validator points out syntax errors so you can find and fix the problem.
Can I minify as well as beautify?
Yes. You can pretty-print JSON or compact it to a single line.
Is it free?
Yes. The formatter is completely free with no sign-up.