JSON Formatter & Validator
Format, validate, and beautify JSON instantly. Catches syntax errors with line numbers. Runs entirely in your browser — nothing you paste is ever sent anywhere.
🔒 Runs entirely in your browser — no data is ever sent anywhereFrequently asked questions
Is it safe to paste sensitive JSON data here?
Yes. This tool runs entirely in your browser using JavaScript's built-in JSON.parse — your data is never sent to a server or stored anywhere, even temporarily.
What's the difference between formatting and validating JSON?
Validating just checks whether the JSON is syntactically correct. Formatting (also called 'pretty printing') additionally re-indents it with consistent spacing so it's easier to read. This tool does both at once — if it formats successfully, the JSON is valid.
Why does it show an error with a specific position?
JSON parse errors report the character position where parsing failed, which usually points to a missing comma, an unquoted key, or a trailing comma right before that position.