JSON Formatter

Format, validate, and minify JSON instantly in your browser. Paste raw or minified JSON to beautify it with proper indentation, or minify it for production.

Summary:This JSON Formatter validates, prettifies, and minifies JSON instantly in your browser with no data leaving your device.

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Copy this code snippet to add the JSON Formatter to your blog or website for free. It adjusts dynamically to mobile and desktop screens.

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How to Use JSON Formatter

Our JSON Formatter is a free browser-based utility: 1. Paste raw or minified JSON into the input box. 2. Select indent style (2 spaces, 4 spaces, or tab). 3. Click 'Format' to prettify or 'Minify' to compress. 4. Validation errors appear in red with the exact line and column number. 5. Click 'Copy' to copy the result to your clipboard.

JSON Formatter Formula / How It Works

This tool parses your JSON using the browser's native JSON.parse() to validate structure. For formatting, it uses JSON.stringify() with an indent parameter. All processing happens locally in your browser tab.

Formula:Formatting uses JSON.parse() for validation and JSON.stringify(parsed, null, indent) for output.
Example Calculation:

For example, pasting '{"name":"John","age":30}' and clicking Format outputs: { "name": "John", "age": 30 }

Frequently Asked Questions

It parses your raw or minified JSON and reformats it with proper indentation, line breaks, and syntax highlighting — making it human-readable. It also validates your JSON and reports any syntax errors with the line and position of the problem.

Yes. If your JSON contains a syntax error (missing comma, unquoted key, trailing comma, etc.), the formatter highlights the exact error location and shows a descriptive error message so you can fix it quickly.

Yes. It processes JSON of any size and depth entirely in your browser without sending data to any server. For very large files (>10MB), processing may take a moment depending on your device.

Yes. In addition to beautifying/formatting JSON, you can minify it to remove all unnecessary whitespace and produce the most compact valid JSON string — useful for reducing API payload sizes.

No. All formatting, validation, and minification happen entirely in your browser using JavaScript. Your JSON content is never transmitted to or stored on any server.

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