How do I format JSON online?

Paste your JSON into the editor and it is automatically formatted with proper indentation. You can also validate, search, and explore the data in a collapsible tree view.

Can I compare two JSON files?

Yes. Use the diff mode to compare two JSON documents side by side with highlighted differences.

JSON Viewer

Format, validate, diff, and explore JSON data with ease.

Indent:

Input

Output

Formatted output will appear here…

About the JSON Viewer

Format, validate, explore, and diff JSON data with tree view, search, and large file support. Free online JSON formatter and validator.

The JSON Viewerruns entirely in your browser — your data is never uploaded to a server, so it stays private and works instantly, even offline. It's completely free, requires no sign-up, and works on desktop and mobile.

Frequently Asked Questions

How do I format JSON online?: Paste your JSON into the editor and it is automatically formatted with proper indentation. You can also validate, search, and explore the data in a collapsible tree view.
Can I compare two JSON files?: Yes. Use the diff mode to compare two JSON documents side by side with highlighted differences.

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