Is my JSON uploaded to a server?

No. Formatting and validation run entirely in your browser, so your data never leaves your device.

What happens if my JSON is invalid?

You get a clear error message with the character position so you can locate and fix the problem quickly.

Can I explore large, nested JSON?

Yes. The tree view lets you expand and collapse nodes to navigate deeply nested structures.

JSON Formatter

Format, minify, and explore JSON with a collapsible tree view. Validate with error location. All in your browser.

About JSON Formatter

JSON Formatter beautifies, minifies, and validates JSON, and lets you explore it as a collapsible tree. Paste JSON or open a file, catch syntax errors with the exact character position, and copy or download the result. Everything runs in your browser, so your data stays private.

Features

Pretty-print JSON with clean 2-space indentation
Minify JSON to the smallest valid form
Explore a collapsible tree view with expand and collapse all
Validate JSON with the exact error position
Copy the result or download it as a .json file

How to use JSON Formatter

1Paste your JSON, or open a .json file.
2Switch between Pretty, Compressed, and Tree views.
3Fix any errors using the reported position.
4Copy or download the formatted JSON.

Frequently asked questions

Is my JSON uploaded to a server?: No. Formatting and validation run entirely in your browser, so your data never leaves your device.
What happens if my JSON is invalid?: You get a clear error message with the character position so you can locate and fix the problem quickly.
Can I explore large, nested JSON?: Yes. The tree view lets you expand and collapse nodes to navigate deeply nested structures.