JSON Formatter & Validator
Format, validate, and minify JSON instantly. Errors point you to the exact line and column. Runs locally in your browser.
Output will appear here…
What is a JSON Formatter?
A JSON formatter validates that your JSON is syntactically correct, pretty-prints it with consistent indentation, and can also minify it back into a single compact line. This one runs entirely in your browser, your payloads stay on your machine.
FAQs
Is it safe to paste sensitive JSON?
Yes. The parser is the browser's built-in JSON.parse; nothing is sent to a server.
Why does it say my JSON is invalid?
Common gotchas: trailing commas, single quotes instead of double, missing closing braces, or unquoted keys. The error message includes the line and column to help you find the spot.
Can it handle huge files?
Up to a few megabytes comfortably. Beyond that you'll start to notice browser lag; for really large datasets, use a desktop tool like jq.