JWT in 60 Seconds 👇 What is JWT ? JWT = JSON Web Token A compact, URL-safe token used for: - Authentication - Authorization - Secure API communication - Identity sharing between services It is digitally signed, so it can be verified and trusted. 🟢 Why JWT exists Typical... flow without JWT: User → Application → Database (Session Store) - Server stores sessions - Requires memory/storage - Hard to scale in microservices - More infrastructure complexity - Needs sticky sessions behind Load Balancer - This doesn’t scale well in distributed systems. 🟢 JWT comes into the picture - JWT is stateless authentication. New flow: User → Application → JWT → Client → API - No session stored on server - Token carries user identity & claims - Server only verifies signature - Perfect for scalable systems. 🟢 Complete JWT request flow 1️⃣ User logs in with credentials 2️⃣ Server validates user 3️⃣ Server generates JWT (Header + Payload + Signature) 4️⃣ Client stores JWT (usually in browser/app) 5️⃣ Client sends JWT in Authorization header 6️⃣ Server verifies signature 7️⃣ If valid → Access granted No database lookup for session needed. 🟢 Where JWT is used in real systems? - REST APIs - Microservices authentication - OAuth2 / SSO - API Gateways - Kubernetes dashboards - CI/CD tools - Mobile & SPA applications - Almost every modern cloud-native app uses JWT. 🟢 JWT in DevOps & System Design : As a DevOps engineer, JWT knowledge is used in: - Designing stateless applications - Scaling apps behind Load Balancers - Implementing API security - Working with IAM & OAuth providers - Securing microservices communication - Reducing session storage dependency Stateless auth = Better scalability + Simpler infrastructure Thanks for reading. Happy Learning !show more

Nandkishor

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