Grouping and versioning not working well together in swagger in asp net core 3 1


Swagger is a powerful tool for documenting and testing APIs in ASP.NET Core applications. It provides a user-friendly interface that allows developers to explore and interact with the API endpoints. However, there are certain scenarios where and versioning do not work well together in Swagger, especially in ASP.NET Core 3.1. In this article, we will discuss this issue and provide possible solutions.

The Problem

When using Swagger in ASP.NET Core 3.1, grouping and versioning can sometimes conflict with each other. Grouping allows you to your API endpoints into logical groups, while versioning allows you to have versions of the same API. However, when both grouping and versioning are used together, Swagger may not display the correct endpoints or may not them properly.

Possible Solutions

There are a few possible solutions to this problem:

Solution 1: Use Explicit Route Attributes

One way to solve this issue is to use explicit route attributes for your API endpoints. By specifying the route explicitly, you can ensure that Swagger correctly identifies and groups the endpoints. Here's an example:

public IActionResult GetUsersV1()
    // Implementation

In this example, we explicitly the route for the API endpoint. This helps Swagger to correctly group the endpoint under the “api/v1” group.

Solution 2: Use Custom Swagger Filters

Another solution is to use custom Swagger filters to modify the Swagger document at runtime. By implementing a custom filter, you can the Swagger document to correctly group the endpoints based on your versioning scheme. Here's an example:

public class SwaggerVersionFilter : IDocumentFilter
    public void Apply(SwaggerDocument swaggerDoc, DocumentFilterContext context)
        // Modify the Swagger document to group endpoints based on versioning

In this example, we implement the IDocumentFilter interface and the Apply method. the method, we can manipulate the swaggerDoc object to correctly group the endpoints based on versioning.

Solution 3: Use Third-Party

If the above solutions do not meet your requirements, you can consider using third-party libraries that provide better support for grouping and versioning in Swagger. There are several popular libraries available, such as Swashbuckle.AspNetCore and NSwag, which offer advanced features and customization options for Swagger integration in ASP.NET Core applications.


Grouping and versioning can sometimes pose challenges when using Swagger in ASP.NET Core 3.1. However, by using explicit route attributes, custom Swagger filters, or third-party libraries, you can overcome challenges and ensure that Swagger correctly displays and groups your API endpoints. Choose the solution that best fits your requirements and enjoy the benefits of Swagger in your ASP.NET Core applications.

Rate this post

Leave a Reply

Your email address will not be published. Required fields are marked *

Table of Contents