Format JSON

Format and validate JSON code

About this tool

Format and validate JSON in seconds. Paste minified or messy JSON and get an indented, colored version that's easy to read. If something is wrong, the tool flags the JSON as invalid.

It's ideal for inspecting API responses, reviewing config files and preparing data for documentation. Processing happens in your browser, with nothing sent to a server.

How to use

Paste your JSON into the text area.
Click the button to format and validate.
Copy the result or go back to edit and adjust.

Frequently asked questions

Is my JSON sent to a server?

No. Formatting and validation happen locally in your browser.

What happens if the JSON is invalid?

The tool warns you about the error so you can fix it before formatting.

Which indentation is used?

Two spaces, the most common and readable standard for JSON.