JWT Decoder
Paste a JWT to instantly decode its header and payload as readable JSON.
Pourquoi utiliser cet outil ?
A JWT looks like an opaque string, but its header and payload are just Base64-encoded JSON. This tool decodes both parts instantly so you can inspect the claims (expiry, user id, roles...) without leaving your browser or exposing the token to a server. Note: this only decodes the token, it does not verify its signature.