Examples
C# Authentication API
Building an Authentication API
C# authentication API uses JWT for secure endpoints.
Introduction to JWT in C#
JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims to be transferred between two parties. The claims in a JWT are encoded as a JSON object that is used as the payload of a JSON Web Signature (JWS) structure or as the plaintext of a JSON Web Encryption (JWE) structure, enabling the claims to be digitally signed or integrity protected with a Message Authentication Code (MAC) and/or encrypted.
In C#, JWTs are commonly used for authentication and information exchange. This tutorial will guide you through the creation of a simple authentication API using JWTs in C#.
Setting Up the Project
To begin, you'll need to set up a new C# project. You can use the .NET CLI to create a new Web API project:
Navigate into the project directory:
Installing Required Packages
To use JWT in your project, you need to install the Microsoft.AspNetCore.Authentication.JwtBearer package. Run the following command:
Configuring JWT Authentication
In the Startup.cs file, configure the JWT authentication in the ConfigureServices method:
Generating JWT Tokens
You can generate a JWT token after validating user credentials. Below is an example of a method to generate a JWT token:
Securing Endpoints with JWT
To secure your API endpoints, use the [Authorize] attribute. For example:
Testing the Authentication API
Once your API is set up, you can test it using a tool like Postman. First, authenticate to receive a JWT token, and then use this token to access secured endpoints.
That's it! You now have a basic understanding of how to implement a JWT-based authentication API in C#.
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