Advanced – Security Testing
JSON Web Token (JWT) – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A compact, URL-safe token format used to securely transmit claims between parties, signed to guarantee integrity.
In simple words
A signed JSON blob used to prove who you are between services.
Exam tip
Never store JWTs in localStorage for XSS-exposed apps; know the header/payload/signature structure.
Related terms
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