JSON Formatter & Validator

JSON formatting (also called prettifying or beautifying) adds indentation and newlines to compact JSON so it is easy for humans to read. A JSON formatter automates this step so you do not need a desktop editor or command-line tool.

Minification removes all whitespace, newlines, and unnecessary characters from JSON, reducing file size for faster API transfers. Use the Minify button in this JSON formatter when you need a compact single-line payload.

The JSON formatter uses the browser's built-in JSON.parse() to detect syntax errors. If parsing fails, we extract the error message and identify the line number so you can fix the problem quickly.

The tool works well for typical JSON payloads up to a few megabytes. Very large files (10 MB+) may be slow depending on your device's performance.

Yes, completely. This JSON formatter runs entirely in your browser. Nothing is sent to any server, and your data is never stored or logged — safe for API keys, config files, and production payloads.

You can choose between 2-space and 4-space indentation using the selector above the output panel, matching the most common coding style guides.