QuickConvert
Free online tools
← All tools
Input
Load sample
Format
Minify
Validate
Copy
Clear
Invalid JSON
Output
Instant results — no waiting
No sign-up needed
Free forever
JSON
Formatter
— Free Online Tool
Beautify, minify & validate JSON — instantly, 100% in your browser.
How it works
1
Paste your JSON
Drop in messy or minified JSON — or hit Load sample to try it.
2
Format, minify or validate
One click beautifies, compacts, or checks your JSON.
3
Copy the result
Invalid JSON? The error box shows the exact line and column to fix.
Frequently asked questions
Is my JSON uploaded anywhere?
No. Parsing, formatting and validation happen 100% in your browser — nothing is sent to any server.
What do the error messages mean?
The tool shows the exact parse error plus the line and column where it failed, so you can jump straight to the problem and fix it.
How large a file can it handle?
It is designed for typical API responses and config files. Extremely large pastes may slow down older phones, but there is no hard limit.