JWT Authentication in ASP.NET Core Web API (Part 1) | Token-Based Authentication Explained

JWT Authentication in ASP.NET Core Web API (Part 1) – Learn token-based authentication, JWT structure (Header, Payload, Signature), and the request flow used in real Web APIs.
This video builds the foundation before we implement Access/Refresh tokens, Auth Server, and Resource Servers.

In this video, we begin a complete, real-world series on JWT Authentication in ASP.NET Core Web API, starting from the fundamentals.

Modern Web APIs serve multiple clients (web apps, mobile apps, desktop apps, microservices). That’s why token-based authentication is preferred over traditional session-based approaches for APIs. In Part 1, you will understand why JWT (JSON Web Token) is needed, how it works internally, and how the browser/client communicates securely with a stateless API using JWT.

What you will learn in this video:

Why authentication and authorization are mandatory for Web APIs

What JWT authentication is and why it is widely used

How token-based authentication works in real applications

Structure of a JWT (Header, Payload, Signature)

Authentication vs Authorization (clear difference)

Why APIs should be stateless and how JWT supports stateless security

High-level flow of JWT authentication in ASP.NET Core Web API

This video focuses on conceptual clarity before implementation. In upcoming parts, we will build a production-ready authentication system using:

ASP.NET Core Web API

JWT Access Tokens and Refresh Tokens

Authentication Server (Token Issuer)

Resource Servers (Protected APIs)

Role-based and policy-based authorization

Claims-based authorization + JWT Bearer authentication

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