#json-dataUpdated 2026-07-01
JSON Formatter
Format, validate, and beautify JSON data online.
Input
Output
Result will appear here.
runs locally
Features
- Runs entirely in your browser
- Detects and explains syntax errors
- Adjustable indentation
- Minify or pretty-print
How to use JSON Formatter
- 1Paste or type your JSON into the input area
- 2Click Format to validate and beautify it
- 3Copy or download the formatted result
Example
Input — Minified input
{"user":"ada","roles":["admin","dev"],"active":true}Output
{
"user": "ada",
"roles": [
"admin",
"dev"
],
"active": true
}What JSON Formatter does
Format, validate, and beautify JSON data online. It runs entirely client-side, so nothing you enter is sent to a server — useful when working with sensitive data or when you just want an instant result without waiting on a network round-trip.
Common use cases
- Cleaning up minified API responses while debugging
- Validating config files before committing them
- Comparing payload structure during code review
FAQ
Is my JSON uploaded anywhere?
No. Formatting happens locally in your browser tab — nothing is sent to a server.
What's the maximum input size?
There's no hard limit, but very large payloads (tens of MB) may slow down your browser tab rather than the tool itself.
Can it fix invalid JSON automatically?
It flags the exact line and character of a syntax error so you can fix it, rather than guessing a fix for you.
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