JSON Formatter & Validator

Pretty-print, minify and validate JSON instantly. Runs entirely in your browser — your data never leaves your device.

📖 Read the guide: How to Format JSON Online →

Input
Output 

        

      

      

    
    

      
How it works

      
1
Paste your JSON
Drop raw or messy JSON into the input box — it stays on your device.
2
Format or minify
Click Format to pretty-print with your chosen indent, or Minify to compact it.
3
Catch errors
Invalid JSON shows the exact line and column so you can fix it fast.
4
Copy or download
Copy the result or save it as a .json file in one click.

    

    

      
Frequently Asked Questions

      
No. Everything is parsed and formatted entirely in your browser — nothing is uploaded or stored.
Yes — it formats large documents quickly because it runs locally with no network round-trip.
Yes. If the JSON is invalid, it shows the parser message with the exact line and column.

    

    

      
Format, beautify, minify and validate JSON online for free. Paste any JSON and pretty-print it with 2-space, 4-space or tab indentation, or compact it to a single line. If the JSON is invalid you get the precise error location. Because everything runs locally in your browser, your data never leaves your device — ideal for API responses, config files and payloads you would rather not paste into a remote server.