How to make Swagger show examples of objects returned from the API?

How to make Swagger show examples of objects returned from the API?

To add examples of objects returned from your ASP.NET Core Web API to Swagger, you can use the Swashbuckle.AspNetCore.Examples NuGet package. This package provides a set of classes that you can use to define examples for your API methods and models.

Here are the steps to use Swashbuckle.AspNetCore.Examples to add examples to your API documentation:

  • Install the Swashbuckle.AspNetCore.Examples NuGet package.
  • Create an example object for your API model. This object should contain the same properties as your model, but with example values. For example:
public class MyModelExample
{
    public int Id { get; set; } = 1;
    public string Name { get; set; } = "John Doe";
}
  • Create an example provider that implements the IExamplesProvider interface. This provider should return the example object you created in the previous step. For example:
public class MyModelExampleProvider : IExamplesProvider
{
    public object GetExamples()
    {
        return new MyModelExample();
    }
}
  • Add the SwaggerResponseExample attribute to your API method, passing in the HTTP status code and the type of your model. For example:
[HttpGet]
[SwaggerResponse((int)HttpStatusCode.OK, Type = typeof(MyModel))]
[SwaggerResponseExample((int)HttpStatusCode.OK, typeof(MyModelExampleProvider))]
public IActionResult Get()
{
    // ...
}
  • Generate the Swagger documentation for your API. The examples will be included in the response body schema for your model.

With these steps, you should be able to add examples to your Web API methods and models in Swagger using the Swashbuckle.AspNetCore.Examples package.

Examples

  1. "Swagger Example Responses with XML Comments"

    • Code:
      /// <summary>
/// Gets the list of products.
/// </summary>
/// <remarks>
/// Sample response:
///
///     [
///       {
///         "id": 1,
///         "name": "Product 1"
///       },
///       {
///         "id": 2,
///         "name": "Product 2"
///       }
///     ]
/// </remarks>
[HttpGet]
[ProducesResponseType(typeof(List<Product>), 200)]
public IActionResult GetProducts()
{
    // Implementation
}
    • Description: Use XML comments and the [ProducesResponseType] attribute to provide example responses for Swagger.

  2. "Swagger Example Responses with SwaggerResponseAttribute"

    • Code:
      [HttpGet]
[SwaggerResponse(200, "List of products", typeof(List<Product>))]
public IActionResult GetProducts()
{
    // Implementation
}
    • Description: Utilize the [SwaggerResponse] attribute to specify example responses directly in the action method.

  3. "Swagger Example Responses with SwaggerObjectResult"

    • Code:
      [HttpGet]
public IActionResult GetProducts()
{
    var products = new List<Product>
    {
        new Product { Id = 1, Name = "Product 1" },
        new Product { Id = 2, Name = "Product 2" }
    };

    return new SwaggerObjectResult(products);
}
    • Description: Return a SwaggerObjectResult with the desired object to provide an example in Swagger.

  4. "Swagger Example Responses with ProducesResponseType and ResponseWrapper"

    • Code:
      [HttpGet]
[ProducesResponseType(typeof(ResponseWrapper<List<Product>>), 200)]
public IActionResult GetProducts()
{
    var products = new List<Product>
    {
        new Product { Id = 1, Name = "Product 1" },
        new Product { Id = 2, Name = "Product 2" }
    };

    return Ok(new ResponseWrapper<List<Product>>(products));
}
    • Description: Use a custom ResponseWrapper class to encapsulate the response and provide examples with [ProducesResponseType].

  5. "Swagger Example Responses with Swashbuckle.Examples"

    • Code:
      [HttpGet]
[SwaggerResponseExample(200, typeof(List<Product>), typeof(ProductsResponseExample))]
public IActionResult GetProducts()
{
    // Implementation
}
    • Description: Use Swashbuckle.Examples to define example responses for Swagger.

  6. "Swagger Example Responses with OperationFilter"

    • Code:
      public class ExamplesOperationFilter : IOperationFilter
{
    public void Apply(Operation operation, SchemaRegistry schemaRegistry, ApiDescription apiDescription)
    {
        // Add example responses to the operation
    }
}

      GlobalConfiguration.Configuration
    .EnableSwagger(c =>
    {
        // Other Swagger configurations
        c.OperationFilter<ExamplesOperationFilter>();
    })
    .EnableSwaggerUi();
    • Description: Implement a custom IOperationFilter to add example responses and apply it during Swagger configuration.

  7. "Swagger Example Responses with Swashbuckle.AspNetCore.Filters"

    • Code:
      [HttpGet]
[SwaggerResponseExample(200, typeof(List<Product>), typeof(ProductsResponseExample))]
public IActionResult GetProducts()
{
    // Implementation
}
    • Description: Use Swashbuckle.AspNetCore.Filters to provide example responses in Swagger.

  8. "Swagger Example Responses with XML Comments and IExamplesProvider"

    • Code:
      /// <summary>
/// Gets the list of products.
/// </summary>
/// <remarks>
/// Sample response:
///
///     [
///       {
///         "id": 1,
///         "name": "Product 1"
///       },
///       {
///         "id": 2,
///         "name": "Product 2"
///       }
///     ]
/// </remarks>
[HttpGet]
[ProducesResponseType(typeof(List<Product>), 200)]
public IActionResult GetProducts()
{
    // Implementation
}

public class ProductsResponseExample : IExamplesProvider<List<Product>>
{
    public List<Product> GetExamples()
    {
        return new List<Product>
        {
            new Product { Id = 1, Name = "Product 1" },
            new Product { Id = 2, Name = "Product 2" }
        };
    }
}
    • Description: Combine XML comments with IExamplesProvider to provide example responses for Swagger.

  9. "Swagger Example Responses with Swashbuckle.AspNetCore.SwaggerGen"

    • Code:
      services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { Title = "My API", Version = "v1" });
    c.OperationFilter<ExamplesOperationFilter>();
});

      public class ExamplesOperationFilter : IOperationFilter
{
    public void Apply(OpenApiOperation operation, OperationFilterContext context)
    {
        // Add example responses to the operation
    }
}
    • Description: Use Swashbuckle.AspNetCore.SwaggerGen to add example responses during Swagger generation.

  10. "Swagger Example Responses with Swashbuckle.AspNetCore.Annotations"

    • Code:
      [HttpGet]
[SwaggerResponse(200, "List of products", typeof(List<Product>))]
public IActionResult GetProducts()
{
    // Implementation
}
    • Description: Use Swashbuckle.AspNetCore.Annotations to specify example responses directly in the action method.

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