💻 Developer Tools

JSON Formatter

Format, validate, and minify JSON data with syntax highlighting.

The JSON Formatter is a completely free online tool that requires no sign-up or account. Format, validate, and minify JSON data with syntax highlighting. Instant results in your browser — no downloads, no limits.

Input JSON
Output

    

JSON is the language of the web, but it’s a pain to read when it’s minified. Our formatter turns a messy string of data into a clean, hierarchical tree that you can actually debug.

The "Trailing Comma" Nightmare

If you’ve ever had a script break because of a single misplaced comma, you know why a strict validator is important. Our tool doesn’t just "pretty print"—it validates your syntax against the RFC 8259 standard.

Human-Friendly Debugging

We’ve added Syntax Highlighting that makes keys and values easy to distinguish. In my own dev workflow, I use this tool daily to inspect API responses before piping them into my code.

Frequently Asked Questions

Can I minify JSON too?
Yes, there is a "Minify" button that removes all unnecessary whitespace, making your data as small as possible for transmission.
What happens if my JSON is invalid?
The tool will flag the exact line and character where the error occurs, helping you fix it instantly.