Paste your JSON to format it with proper indentation, validate its structure, or minify it for production. JSON Formatter shows clear error messages with line numbers when input is invalid, and supports one-click copy of the result. Everything runs in your browser — ideal for debugging APIs and configuring data files.
Your data is processed entirely in your browser. Nothing is uploaded to any server.
Yes, JSON Formatter is 100% free and runs entirely in your browser.
No. Everything is processed locally on your device; nothing is uploaded.
No. JSON Formatter runs in any modern browser, no installation or signup required.
Yes. Your input stays in your browser and is never stored or transmitted.