JWT Decoder

Decode header + payload from any JSON Web Token.

JWT token

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "julius",
  "name": "Julius Mason",
  "iat": 1730000000
}

Note: This tool only decodes — it never verifies the signature.

From the blog

JWT Decoder: What It Is and Who It's For — read the guide

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