JSON Formatter & Validator

Format and validate JSON data with our free online JSON Formatter & Validator. This powerful tool beautifies minified JSON, validates syntax, and provides clear error messages for debugging. Perfect for developers working with APIs, configuration files, or any JSON data that needs to be readable and verified.

Enter JSON data:

Format & Validate Clear

How This Tool Works

The JSON Formatter & Validator uses JavaScript's built-in JSON.parse() and JSON.stringify() methods to process your data. When you input JSON, the tool first attempts to parse it to validate syntax correctness. If valid, it reformats the JSON with proper indentation (4 spaces) for readability. If invalid, it provides detailed error messages indicating the exact location and nature of the syntax error. All processing happens client-side in your browser, ensuring your data never leaves your device.

Common Use Cases

• Beautifying minified JSON from APIs for easier reading
• Validating JSON configuration files before deployment
• Debugging JSON syntax errors in development
• Formatting JSON responses from REST APIs
• Preparing JSON data for documentation or sharing
• Converting compact JSON to readable format for analysis

Privacy & Security

Your JSON data formatting and validation is completely private. All processing occurs directly in your web browser using JavaScript, meaning your JSON data never gets sent to our servers. No data is stored, logged, or transmitted. The tool works entirely offline once loaded, ensuring maximum privacy and security for your sensitive JSON content.