JSON Tools

Format JSON or convert nested Python dictionaries and lists.

Runs locally in your browser. Your input is not uploaded or saved.

Input syntax

Output style

Indentation

JSON input

Formatted JSON

JSON mode uses JavaScript parsing. Very large numbers can lose precision and duplicate object keys keep the last value. Up to 1,000,000 characters.

Also useful

JWT Tools

Decode, edit, sign and verify JWTs locally in your browser.

Encode and decode UTF-8 text with URL-safe and multi-layer Base64.