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In asp.net Core, for authorized APIs you can easily pass the JWT token via PostMan like below: 

But swagger you don't have authentication by installing it, add the following configuration to services to enable the authentication in swagger  as well:

 services.AddSwaggerGen(options =>
            {
                options.SwaggerDoc("v1", new Info { Title = "My API", Version = "v1" });
                options.AddSecurityDefinition("oauth2", new ApiKeyScheme
                {
                    Description = "Standard Authorization header using the Bearer scheme. Example: \"bearer {token}\"",
                    In = "header",
                    Name = "Authorization",
                    Type = "apiKey"
                });
            });

You will see the Authorize button on top right corner: