Brief Add SwaggerGen to the services collection in the Configure method, and in the ConfigureServices method, enable the middleware for serving generated JSON document and the SwaggerUI. public void ConfigureServices ( IServiceCollection services ) { // Add framework services. services . AddMvc (); services . AddLogging (); // Add our repository type services . AddSingleton < ITodoRepository , TodoRepository >(); // Inject an implementation of ISwaggerProvider with defaulted settings applied services . AddSwaggerGen (); } // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. public void Configure ( IApplicationBuilder app , IHostingEnvironment env , ILoggerFactory loggerFactory ) { app . UseMvcWithDefaultRoute (); // Enable middleware to serve generated Swagger as a JSON endpoint app . UseSwagger (); // Enable middlewar...