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🔐 Authentication & Authorization in ASP.NET Core (JWT, Roles & Policies) · devs3

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#dotnet #authorization #asp.net-core #asp.net #dotnet-core-authentication #jwt #dotnet-security

🔐 Authentication & Authorization in ASP.NET Core (JWT, Roles & Policies)

By Samim Hossain · February 15, 2026 · 3 min read · 221 views

Introduction

Security is not optional in modern applications.
Whether you are building a public API, SaaS platform, or mobile backend, authentication and authorization are critical.

In ASP.NET Core, security is:

Powerful
Flexible
Production-ready

In this article, you’ll learn how authentication and authorization really work, with JWT-based authentication, roles, and policies—exactly how real-world systems are built.

This is Week 7 of our .NET weekly blog series.

Authentication vs Authorization (Very Important)

Many beginners confuse these two concepts.

plaintext

| Term           | Meaning                     |
| -------------- | --------------------------- |
| Authentication | Who are you?                |
| Authorization  | What are you allowed to do? |

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builder.Services.AddAuthentication("Bearer")
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = "myapp",
            ValidAudience = "myapp",
            IssuerSigningKey = new SymmetricSecurityKey(
                Encoding.UTF8.GetBytes("SUPER_SECRET_KEY_123")
            )
        };
    });

app.UseAuthentication();
app.UseAuthorization();

public string GenerateToken(string username, string role)
{
    var claims = new[]
    {
        new Claim(ClaimTypes.Name, username),
        new Claim(ClaimTypes.Role, role)
    };

    var key = new SymmetricSecurityKey(
        Encoding.UTF8.GetBytes("SUPER_SECRET_KEY_123")
    );

    var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

    var token = new JwtSecurityToken(
        issuer: "myapp",
        audience: "myapp",
        claims: claims,
        expires: DateTime.Now.AddHours(2),
        signingCredentials: creds
    );

    return new JwtSecurityTokenHandler().WriteToken(token);
}

[Authorize]
[ApiController]
[Route("api/profile")]
public class ProfileController : ControllerBase
{
    [HttpGet]
    public IActionResult GetProfile()
    {
        return Ok("Secure profile data");
    }
}

🔐 Authentication & Authorization in ASP.NET Core (JWT, Roles & Policies)

Introduction

Authentication vs Authorization (Very Important)

Join the conversation

Comments

.NET প্রজেক্টে Two-Factor Authentication (2FA) Enable করার সহজ গাইড

Beyond Free: Unpacking the Real Costs of .NET Development

Authentication in ASP.NET Core

What Is JWT (JSON Web Token)?

JWT Structure

JWT Authentication Flow

Step 1: Install Required Packages

Step 2: Configure JWT in Program.cs

Step 3: Generate JWT Token

Step 4: Secure Your API Endpoints

Protect Controller

Role-Based Authorization

Role-Based Example

Policy-Based Authorization (Advanced)

Define Policy

Use Policy

Claims-Based Authorization

Common Security Mistakes 🚫

Best Practices ✅

What You’ve Learned

🔜 Coming Next

User Management & Identity (ASP.NET Core Identity)

Introduction

Authentication vs Authorization (Very Important)

Join the conversation

Comments

Keep reading

.NET প্রজেক্টে Two-Factor Authentication (2FA) Enable করার সহজ গাইড

Beyond Free: Unpacking the Real Costs of .NET Development

Authentication in ASP.NET Core

What Is JWT (JSON Web Token)?

JWT Structure

JWT Authentication Flow

Step 1: Install Required Packages

Step 2: Configure JWT in Program.cs

Step 3: Generate JWT Token

Step 4: Secure Your API Endpoints

Protect Controller

Role-Based Authorization

Role-Based Example

Policy-Based Authorization (Advanced)

Define Policy

Use Policy

Claims-Based Authorization

Common Security Mistakes 🚫

Best Practices ✅

What You’ve Learned

🔜 Coming Next

User Management & Identity (ASP.NET Core Identity)