JSON Web Token
Short definition
A digitally signed token format used to authenticate users in web and mobile apps without storing sessions on the server.
Extended definition
A JWT has 3 parts: Header (signature type), Payload (user data and permissions), and the digital signature. When the user logs in, they receive a JWT sent with every subsequent request in the Header. The advantage: no session database needed, works perfectly in microservice architectures.
Read the full guide
This short definition is the quick answer. For the deep dive with code examples, real case studies, and step-by-step implementation, see the full guide.
Mobile App SecurityExample & use case
A mobile app signs the user in and receives a JWT valid for 7 days, stored in Keychain (iOS) or Keystore (Android).
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