How to fix 'Authorization in ASP.NET Core' with 401 Unauthorized
By FoxLearn 2/10/2025 2:14:08 AM 1.41K
Fixing authorization issues in ASP.NET Core throw 401 exception c# can involve several steps.
core.unauthorized-error 401 unauthorized jwt
First, make sure that you have properly configured authentication middleware in your Startup.cs
file. This typically involves adding authentication services in the ConfigureServices
method and setting up authentication middleware in the Configure
method.
// ConfigureServices method services.AddAuthentication(options => { options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme; options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; }).AddJwtBearer(options => { options.TokenValidationParameters = new TokenValidationParameters { ValidateIssuer = true, ValidateAudience = true, ValidateLifetime = true, ValidateIssuerSigningKey = true, ValidIssuer = Configuration["Jwt:Issuer"], ValidAudience = Configuration["Jwt:Issuer"], IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["Jwt:Key"])) }; }); // Configure method app.UseAuthentication(); app.UseAuthorization();
You should configure your middleware must be in the correct order for the ASP.NET Framework properly inject the identity context to http request in the StartUp.Configure as shown below.
app.UseRouting(); app.UseAuthentication(); app.UseAuthorization();
Ensure that your controllers or actions are decorated with the appropriate authorization attributes, such as [Authorize]
or [AllowAnonymous]
, depending on your requirements.
[Authorize] public class MyController : ControllerBase { // Your actions }
If your API is accessed from a different origin, ensure that CORS (Cross-Origin Resource Sharing) is configured correctly to allow requests from the client application's domain.
I hope so you can fix 'ASP.NET Core JWT authentication always throwing 401 unauthorized' when sending request from postman.
Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
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