JSON Formatter & Validator

How to Format JSON Online

JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. Whether you’re debugging an API response, reviewing configuration files, or preparing data for documentation, properly formatted JSON is essential for readability.

Our free JSON formatter takes raw or minified JSON and instantly beautifies it with proper indentation, line breaks, and syntax structure. The tool runs entirely in your browser — your data never touches our servers.

Key Features

• Format/Beautify: Transform minified JSON into readable, properly indented code with 2 or 4 space indentation
• Minify: Compress JSON by removing all unnecessary whitespace — perfect for reducing API payload sizes
• Validate: Check your JSON for syntax errors with clear error messages pointing to the exact issue
• Sample Data: Load example JSON to see the tool in action
• Copy to Clipboard: One-click copy of formatted or minified output

Common Use Cases

API Development: When working with REST APIs, responses often come as minified JSON. Paste the response here to quickly understand the data structure and identify the fields you need.

Configuration Files: JSON config files (package.json, tsconfig.json, etc.) can become unwieldy. Format them to review settings, or minify them when file size matters.

Data Analysis: When exploring datasets in JSON format, proper formatting makes it dramatically easier to understand nested structures and spot patterns.

JSON Formatting vs Validation

Formatting restructures valid JSON with proper indentation and whitespace without changing the data. Validation checks whether a string is syntactically valid JSON and reports specific errors if it’s not. Our tool does both — if your input has errors, you’ll see exactly where the problem is.