JSON Formatter & Validator

Paste your JSON — instantly formatted, validated, and syntax-highlighted.

100% client-side — your data never leaves your browser
Paste JSON to start

Input

0 chars

Output

—
Formatted JSON will appear here...

What is JSON Formatter?

JSON Formatter is a free online tool that beautifies, validates, and syntax-highlights your JSON data. It works entirely in your browser — nothing is sent to any server, so your data stays completely private.

Features

Instant formatting with customizable indentation (2 spaces, 4 spaces, or tabs). Real-time validation with clear error messages showing exactly where the problem is. One-click minification for production use. Syntax highlighting with color-coded keys, strings, numbers, and booleans. Keyboard shortcut support (Ctrl+Enter to format). Optional key sorting for consistent output.

How to use

Paste your JSON into the input panel on the left. Click "Format" or press Ctrl+Enter. The formatted result appears on the right with syntax highlighting. Click "Copy" to copy the result to your clipboard.

Common use cases

Debugging API responses, cleaning up configuration files, validating JSON before sending to an API, making minified JSON readable, comparing JSON structures by sorting keys alphabetically.