Why use our JSON Formatter?
Working with APIs and config files means staring at messy, one-line JSON. This free JSON Formatter & Validator instantly beautifies JSON into clean, indented, readable code, minifies it back to a compact single line for production, and validates it — telling you exactly what's wrong and where if there's a syntax error. Choose 2 spaces, 4 spaces or tabs for indentation.
It's perfect for developers debugging API responses, editing config files, or cleaning up exported data. Everything runs locally in your browser, so it's fast, free, needs no sign-up, and your data never leaves your device — safe even for sensitive payloads.
How do I format JSON?
Paste your JSON and tap Format. It's re-indented so it's easy to read.
How do I validate JSON?
Tap Validate — you'll see a confirmation, or the exact error and its position.
Is my JSON data private?
Yes — everything is processed locally in your browser and is never uploaded.