JSON Formatter & Validator
Format, validate and minify JSON entirely in your browser. Nothing is uploaded, so it is safe for internal API payloads. Free, no signup.
100% Client-Side. Zero data uploaded.
Frequently Asked Questions
- Is it safe to paste internal API data here?
- Yes. The formatting runs in JavaScript inside your browser — the JSON is never sent to a server, so confidential payloads stay on your machine.
- What does the validator check?
- It parses your input against the JSON spec and reports the exact line and character position of any syntax error, such as a trailing comma or an unquoted key.