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.

Input Raw JSON

Formatted Output

Tab Size:

Embed this Tool on Your Website

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

<iframe src="https://hellotools.net/tools/json-formatter?embed=true" width="100%" height="650" style="border:none; overflow:hidden;" allowtransparency="true"></iframe>

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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

Common causes are missing quotes around keys, trailing commas (not valid in JSON), or unescaped special characters. The error message shows the exact line and column where the issue occurs.

Format (Prettify) adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace to reduce file size, which is ideal for transmitting data over a network.

A warning is shown for inputs over 1MB. Processing is blocked for inputs over 5MB to prevent browser freezes.

No. All formatting and validation runs entirely in your browser. Your JSON data is never sent to a server.

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