JSON Formatter & Validator
Format, validate and minify JSON. Catch syntax errors instantly.
About this tool
Format, validate and minify JSON instantly. Paste messy or minified JSON to pretty-print it with proper indentation, catch syntax errors, or compress it back down to a single line.
How to use it
- 1 Paste your JSON.
- 2 Click “Format” to beautify or “Minify” to compress.
- 3 Fix any reported syntax errors.
- 4 Copy the result.
Frequently asked questions
Does it validate my JSON?
Yes — invalid JSON is flagged with the parser’s error message so you can find the problem quickly.
Can I choose the indentation?
Yes, pick 2 spaces, 4 spaces or tabs.
Is my data sent anywhere?
Everything runs in your browser, so your data never leaves your device.