How to Decode a JWT Token

Problem: You need to inspect a JSON Web Token to check claims, expiry and header values.

Steps

1. Open the JWT Decoder tool.
2. Paste the token (three-part base64url string) into the input.
3. Click Decode to view header and payload.

Example token (truncated)

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiQWxpY2UifQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Decoded output

Header: {"alg":"HS256","typ":"JWT"}
Payload: {"name":"Alice"}

Security note

Do not paste private keys or tokens with sensitive data into public tools. Use the decoder to inspect non-sensitive tokens or on a secure environment.

Related tools

• Base64 Encoder — inspect base64url fragments.
• JSON Formatter — prettify decoded payloads.