JSON Formatter & Validator
Paste JSON — formats in realtime, highlights all errors at once with line numbers. Minify, revert, and copy in one click.
Input
Output
Formatted JSON will appear here...
Paste JSON — formats in realtime, highlights all errors at once with line numbers. Minify, revert, and copy in one click.
Formatting (beautifying) adds indentation and line breaks to make JSON human-readable. Minifying strips all unnecessary whitespace to make the file as small as possible — useful for production APIs where file size matters more than readability.
The most common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or a missing closing bracket. This tool highlights the exact line where the syntax breaks so you can fix it quickly.
Yes — use the indent selector to switch between common options like 2 spaces, 4 spaces, or tabs, depending on your project's style guide.
No. All formatting, validation and minifying happens locally in your browser — nothing you paste here is ever sent anywhere.