JSON formatter and validator JSON formatter and validator

Format JSON online

Paste compressed or hard-to-read JSON and get a formatted version with consistent indentation.

The tool runs in the browser and is useful for API responses, configuration files and quick debugging.

The tool runs directly in the browser and is ready for quick checks without installing software.
Input can be cleared and recalculated immediately, which is useful for repeated small tasks.
Use fullscreen mode when you need more space for long text, structured data or large result blocks.
Copy buttons are available on generated output so results can be reused in code, documents or support chats.
Most operations are deterministic: the same input and options produce the same output.
For sensitive content, prefer local browser tools and review the result before sharing it further.