Decode a JSON web token.

Debugging authentication usually means staring at a JWT. Three Base64 segments separated by dots, unreadable until decoded. This tool splits the token and decodes the header and payload so you can see the claims, the expiry, and the signing algorithm at a glance. Paste a token to inspect it.

A JWT is Base64 under the hood, so when you're decoding something that isn't a token you can decode Base64 in the browser more generally. The payload is JSON, and once decoded you can clean up minified JSON to pretty-print a dense response.

When you need to share a decoded payload with a teammate while debugging, you can host any file type and send the link rather than pasting JSON into chat. The rest of NudgeHost's free developer tools sit alongside this decoder.

The decoder runs locally and logs nothing, which matters because tokens are sensitive. When something does need hosting, you can share a file now with nothing to set up.