How to format JSON
- Paste your JSON into the top box.
- Click Format to beautify it or Minify to compress it.
- If the JSON is invalid, the exact line and column of the error are shown.
Frequently asked questions
Is my data uploaded anywhere?
No. This tool runs entirely in your browser. Your data never leaves your device, and nothing is stored on our servers.
What are the most common JSON errors?
Trailing commas, single quotes instead of double quotes, unquoted keys and comments. JSON allows none of these.
Can it handle large files?
Yes — multi-megabyte JSON documents format in well under a second in modern browsers.