JSON Formatter

Q: Is my JSON data sent to a server?

No. All JSON processing is done entirely in your browser. Your data never leaves your device.

Format, compress and validate JSON data online

Indent

Input

Output

💡 Click output to auto-copy · All data is processed locally in your browser

About This Tool

A JSON formatter is an essential tool for every developer working with APIs, configuration files, and data exchange. This free online JSON formatter lets you beautify, compress, and validate JSON data instantly — all in your browser.

Common use cases include debugging API responses during development, formatting configuration files like package.json or tsconfig.json, validating JSON before importing it into a database, and sharing formatted JSON snippets with your team. Whether you're preparing a bug report that includes API output or just need to read a messy JSON blob, this tool makes it clean and readable.

The JSON formatter supports adjustable indentation (2 spaces, 4 spaces, 1 space, or minified), real-time error detection with descriptive messages, and one-click copy of the output.

Frequently Asked Questions

Is my JSON data sent to a server?

No. All JSON processing is done entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify(). Your data never leaves your device.

What indentation options are available?

You can choose between 2 spaces, 4 spaces, 1 space, or minified (0 spaces). 2 spaces is the most common convention for readability.

What happens if my JSON is invalid?

The tool shows a clear error message describing the parsing error, including where the error occurred.

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