JWT diff — compare two JSON Web Tokens

Paste two JWTs and see exactly what changed: added, removed and modified claims in header and payload, side by side. Algorithm downgrades between the two tokens (say, RS256 to HS256) are flagged as a security warning, not just a diff line.

Typical uses: comparing tokens before and after a login change, staging vs production issuers, or an ID token against an access token from the same provider. Runs entirely in your browser — decode a single token or read the claims reference.