Free Online JSON Formatter & Validator

JSON (JavaScript Object Notation) has become the de-facto standard for data interchange on the web. It's lightweight, human-readable, and easy for machines to parse. However, raw JSON from APIs often comes minified or deeply nested. Our Free JSON Formatter & Validator is the ultimate tool to clean up, debug, and understand your JSON data with high fidelity.

Features of This Free Tool

Whether you are a backend developer debugging an endpoint or a frontend engineer mocking data, this tool provides everything you need:

• Beautify / Prettify: Instantly format messy, minified JSON into a clean, indented structure that is easy to read.
• Minify: Remove all unnecessary whitespace and newlines to compress your JSON for production use or transmission.
• Validation: Automatically detect syntax errors (like missing quotes or trailing commas) with clear error messages.
• Interactive Tree View: Navigate deeply nested objects and arrays with a collapsible tree interface.
• 100% Free & Secure: All processing is done locally in your browser.

Why is Valid JSON Important?

JSON is strict. A single misplaced comma or unquoted key can break an entire application. Using a validator ensures that your data adheres to the official standard (RFC 8259), preventing runtime crashes and parsing errors in your applications.

Privacy & Security

We understand that your data may be sensitive. That's why this tool processes everything locally in your browser. Your JSON data is never sent to our servers, ensuring complete privacy and security while you debug.