Mixed spa and asp net mvc routing

ASP.NET is a popular programming language used for developing web applications. One common challenge that developers face is dealing with mixed spa and ASP.NET MVC routing. In this article, we will explore this and provide with examples.

When building a web application, developers often single-page application (SPA) frameworks like Angular or React with ASP.NET MVC. This combination allows for a more interactive and dynamic user experience. However, it can also lead to conflicts in routing.

Understanding the Issue

The problem arises when both the SPA and ASP.NET MVC routing systems try to handle the same URL. For example, let's say we have a route defined in our ASP.NET MVC application for “/products”. At the same time, our SPA framework also has a route defined for the same URL. When a user navigates to “/products”, both routing systems will try to handle the request, resulting in unexpected behavior.

Solution 1: Prioritizing ASP.NET MVC Routing

One solution to this problem is to prioritize the ASP.NET MVC routing system over the SPA routing system. This can be achieved by configuring the ASP.NET MVC routes to handle specific URLs before the request to the SPA routing system.

To implement this solution, we can modify the “RouteConfig.cs” file in our ASP.NET MVC application. Here's an example:

public class RouteConfig
    public  void RegisterRoutes(RouteCollection routes)

        //  your ASP.NET MVC routes here

            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }

        // Pass the remaining requests to the SPA routing system

            name: "SPA",
            url: "{*url}",
            defaults: new { controller = "Home", action = "Index" }

In this example, we define our ASP.NET MVC routes first and then add a catch-all route (“SPA”) that will handle any remaining requests. By placing the ASP.NET MVC routes before the catch-all route, we ensure that they take precedence.

Solution 2: Using Attribute Routing

Another solution is to use attribute routing in ASP.NET MVC. Attribute routing allows us to define routes directly on the controller actions or methods, giving us more control over the routing process.

To implement this solution, we need to enable attribute routing in our ASP.NET MVC application. This can be done by the line of code to the “RouteConfig.cs” file:


Once attribute routing is , we can define routes using attributes on our controller actions. Here's an example:

public class ProductsController : Controller
    public ActionResult Index()
        // Handle the "/products" route
        return View();

In this example, we use the [Route] attribute to define the route for the “Index” action of the “ProductsController”. By explicitly specifying the route, we avoid conflicts with the SPA routing system.


When dealing with mixed SPA and ASP.NET MVC routing, it's important to prioritize the ASP.NET MVC routing system and avoid conflicts. By following the solutions provided in this article, developers can ensure that their web applications function as intended and provide a seamless user experience.

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