Free JSON Formatter & Validator Online

Beautify, minify, and validate JSON instantly in your browser — no uploads, no signups.

JSON (JavaScript Object Notation) is the most widely used data format for APIs, configuration files, and data exchange between web applications. Whether you're debugging an API response, cleaning up a config file, or validating a JSON payload before deployment, a reliable formatter is essential.

Our free JSON formatter runs entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify() methods. Your data never leaves your device — no server calls, no storage, no tracking. Perfect for handling sensitive API keys, credentials, or proprietary data structures.

Input JSON

Output

Ready — paste JSON and click an action.

🔒 Your data never leaves your device. All processing runs locally in your browser.

How to Use the JSON Formatter

Format and validate JSON in just a few steps:

Paste your JSON — Copy raw JSON from an API response, config file, or any source and paste it into the input editor.

Choose an action — Click "Beautify" to format with indentation, "Minify" to compress, or "Validate" to check for syntax errors.

Copy the result — Click "Copy" to copy the formatted output to your clipboard, ready to paste into your project.

Frequently Asked Questions

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. It's the standard format for REST APIs, configuration files, and web data exchange.

How does this formatter work?

Paste your JSON into the input editor. Click Beautify to format it with proper indentation, Minify to compress it, or Validate to check for syntax errors. Everything runs locally in your browser using JavaScript's native JSON methods.

Is my data safe?

Yes! All processing runs locally in your browser. Your JSON data is never uploaded or stored on any server. It's 100% private and safe for sensitive data.

What's the difference between Beautify and Minify?

Beautify adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace to create the smallest possible file size — ideal for APIs and production use.

Can I use this offline?

Yes! Once the page is loaded, the tool works entirely offline with no server connection needed.