JSON Formatter
Format, validate, and beautify JSON instantly with clear error messages when something's wrong. Runs entirely client-side.
Result
{
"example": true,
"count": 3
}Free to use, no sign-up, no limit on how many times you run it.More developer tools
Overview
Raw JSON from an API response or log file is often unreadable on one line. This formatter re-indents it for readability and flags syntax errors as you go.
- Instant validation with a precise error location
- Toggle between pretty-printed and minified output
- Adjustable indentation width
- Nothing leaves your browser — safe for sensitive payloads
How to use it
- 1Paste your raw JSON into the input panel
- 2Click Format to beautify, or Minify to compress it
- 3Copy the result, or fix the highlighted error and try again
Example
Turn {"user":{"id":1,"name":"Ana"}} into a clearly indented, multi-line structure that's easy to scan during debugging.
Tips
- — A trailing comma is one of the most common causes of invalid JSON — check the last item in any object or array first
Frequently asked questions
Is my JSON data sent to a server?
No. Formatting and validation both happen locally in your browser using the built-in JSON parser. Nothing is transmitted.
What happens if my JSON is invalid?
The tool shows the specific parsing error, including the position where the parser stopped, so you can find the problem quickly.
Can I minify JSON instead of beautifying it?
Yes — switch to the Minify option to collapse the JSON to a single line with no extra whitespace.