500 error when setting up swagger in asp net core mvc 6 app


When setting up Swagger in an ASP.NET Core MVC 6 app, you may encounter a 500 . This error can be frustrating and may prevent you from successfully integrating Swagger into your application. In this article, we will explore the possible causes of this error and provide solutions to resolve it.

Possible Causes

are several potential causes for the 500 error when setting up Swagger in an ASP.NET Core MVC 6 app. Let's examine some of the common ones:

Missing or Incorrect Configuration

One possible cause of the 500 error is missing or incorrect configuration. that you have properly configured Swagger in your app's Startup.cs file. Here's an example of how to configure Swagger:

 void ConfigureServices(IServiceCollection services)
    // Add Swagger
    services.AddSwaggerGen(c =>
        c.SwaggerDoc("v1", new OpenApiInfo { Title = "My API", Version = "v1" });

Make sure you have the necessary NuGet for Swagger, such as Swashbuckle.AspNetCore. Also, double-check that you have registered the Swagger middleware in your app's Configure method:

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    // Enable Swagger UI
    app.UseSwaggerUI(c =>
        c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API V1");

    // Other middleware configurations...

Missing Required Dependencies

Another possible cause of the 500 error is missing required dependencies. Ensure that you have all the necessary packages and dependencies for Swagger to work properly. For example, make sure you have the correct version of Microsoft.AspNetCore.Mvc installed.

Conflicting Middleware

Conflicting middleware can also cause the 500 error. Check if there are any other middleware components in your app that may with Swagger. Disable or reorder the middleware to see if it resolves the .


The 500 error when setting up Swagger in an ASP.NET Core MVC 6 app can be resolved by and correcting the configuration, ensuring all required dependencies are installed, and resolving any conflicts with other middleware components. By following these steps, you should be able to successfully integrate Swagger into your application and avoid the 500 error.

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