About this json formatter & validator
JSON from APIs and config files often arrives as one unreadable line — or with a syntax error hiding in it. Paste it here to format it beautifully, minify it back down, and find out instantly whether it is valid and where it breaks.
How to use it
- Paste your JSON.
- Click Format for indented, readable output — or Minify for one line.
- If it is invalid, the error message tells you what went wrong.
Worked example
The one-liner {"a":1,"b":[1,2]} formats into an indented block you can actually read and diff.
Frequently asked questions
Is my JSON sent anywhere?
No. Parsing happens with your browser's built-in JSON engine on this page — ideal for tokens and private payloads.
What does the error position mean?
Modern browsers report the character position of the problem. Common causes: trailing commas, single quotes, or unquoted keys — JSON needs double quotes everywhere.
Can it format huge files?
Yes, within your device's memory. Multi-megabyte JSON formats fine on most computers.