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Thursday, July 9, 2026

Developing Single Page Applications using ASP.Net Core and JavaScript - Create Project

Developing Single Page Applications using ASP.Net Core and JavaScript - Create Project

Screenshot from the tutorial
Screenshot from the tutorial

Developing Single Page Applications using ASP.NET Core and JavaScript

In this blog post, we will explore how to develop a Single Page Application (SPA) using ASP.NET Core and JavaScript. SPAs are a popular web application architecture that provides a smoother user experience by loading content dynamically rather than refreshing the entire page. This tutorial is based on a YouTube video titled "Developing Single Page Applications using ASP.Net Core and JavaScript - Create Project" which outlines the project setup in just over four minutes.

What is a Single Page Application?

A Single Page Application is a web application that interacts with the user by dynamically rewriting the current page, rather than loading entire new pages from the server. This results in a more fluid experience, as the app can update content without needing to refresh the page. Popular frameworks and libraries like React, Angular, and Vue.js are often used to build SPAs.

Prerequisites

Before we begin, ensure you have the following installed:

Step 1: Create a New ASP.NET Core Project

To start, let’s create a new ASP.NET Core project using the command line.

  1. Open your terminal or command prompt.

  2. Run the following command to create a new project:

    dotnet new webapp -n MySinglePageApp
    

This command creates a new ASP.NET Core web application named MySinglePageApp. The webapp template sets up a Razor Pages application, which we will modify to serve as our SPA.

Step 2: Navigate to the Project Directory

Change the directory to your newly created project folder:

cd MySinglePageApp

Step 3: Set Up Static Files

For a SPA, you will likely be serving static files such as HTML, CSS, and JavaScript. By default, the ASP.NET Core webapp template has a wwwroot folder for static files.

  1. Inside the wwwroot folder, create an index.html file:

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>My Single Page App</title>
    </head>
    <body>
        <div id="app"></div>
        <script src="app.js"></script>
    </body>
    </html>
    
  2. Create an app.js file also inside the wwwroot folder. This file will contain your JavaScript code for the SPA.

    document.getElementById('app').innerHTML = '<h1>Welcome to My Single Page App</h1>';
    

Step 4: Configure the Application to Serve the Index File

Next, we need to modify the Startup.cs file to serve our index.html file when the application starts. Open Startup.cs and locate the Configure method. Add the following code:

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Error");
        app.UseHsts();
    }

    app.UseHttpsRedirection();
    app.UseStaticFiles();

    app.UseRouting();

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapGet("/", async context =>
        {
            context.Response.ContentType = "text/html";
            await context.Response.SendFileAsync(Path.Combine(env.ContentRootPath, "wwwroot", "index.html"));
        });
    });
}

In this code snippet, we are configuring the application to serve the index.html file when the root URL is accessed.

Step 5: Run the Application

Now that we have everything set up, let's run the application. In your terminal, execute the following command:

dotnet run

Once the application is running, navigate to https://localhost:5001 (or http://localhost:5000 if you are not using HTTPS) in your web browser. You should see the welcome message from your SPA!

Conclusion

In this tutorial, we created a simple Single Page Application using ASP.NET Core and JavaScript. We set up the project, created an index.html and app.js file, and configured the application to serve our SPA correctly.

This is just the beginning. You can expand upon this setup by adding routing, API calls, state management, and more, depending on the complexity of your application. SPAs offer a powerful way to create responsive and dynamic web applications, and ASP.NET Core serves as a robust backend to support it.

Happy coding!

Another screenshot from the tutorial
Another view from the tutorial

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