What is the structure of a JSON web token?

Question

Options

• Athree parts separated by dots header payload, and signature
• Bheader and payload
• Cthree parts separated by dots version header and signature
• Dpayload and signature

• A
  94% (46)
• B
  4% (2)
• D
  2% (1)

Explanation

JSON Web Token (JWT) Structure

Option A is correct because a JWT consists of exactly three Base64Url-encoded parts separated by dots (.): the Header (containing the token type and hashing algorithm), the Payload (containing the claims/data), and the Signature (used to verify the token's integrity). Option B is wrong because it omits the critical Signature component, which is what makes JWTs secure and verifiable. Option C is incorrect because there is no "version" section in a JWT - the three parts are specifically Header, Payload, and Signature. Option D is wrong because it drops the Header, which is essential for defining how the token is encoded and signed.

Memory Tip: Think of a JWT like a "HPS sandwich" - Header, Payload, Signature - all three layers held together by dots (e.g., xxxxx.yyyyy.zzzzz). If any layer is missing, the sandwich falls apart!

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