Format and Validate JSON
Turn messy JSON into clean, readable structure, or compress it for production, in one click. Paste your data to beautify it with proper indentation, minify it to remove whitespace, or validate it to catch syntax errors. Everything runs in your browser, so even sensitive API payloads stay on your device.
What the tool does
- Beautify — adds consistent indentation and line breaks so nested data is easy to read.
- Minify — strips spaces and newlines to shrink the payload for transfer or storage.
- Validate — flags problems such as missing commas, unclosed brackets and trailing commas.
Common JSON mistakes
JSON is strict. Keys and string values must use double quotes, not single quotes. You cannot leave a trailing comma after the last item in an object or array. Every opening brace or bracket needs a matching close. Comments are not allowed. Formatting and validating quickly reveals exactly where one of these slipped in.
When you will reach for it
Developers use it to inspect API responses, tidy configuration files, debug data before it ships and confirm that generated JSON is well formed. A readable layout makes it far easier to spot a wrong value or a misplaced bracket than scanning a single long line.
Private and instant
Your JSON is processed locally and never uploaded, so API keys and customer data are not exposed. There is no signup, no waiting and no limit on how much you can format.