ASP NET Web App vs Web API: Complete Comparison Guide 2024

When it comes to building web applications in the .NET ecosystem, developers often grapple with the decision between using ASP.NET Web App and Web API. Both technologies have their unique strengths and are suited to different types of projects. Let's delve into the intricacies of each and explore their key differences and use cases.

choosing between web api 2 vs asp.net core web api

ASP.NET Web App, a part of the ASP.NET Core framework, is a complete website and web application framework that includes tools and libraries to build dynamic, interactive, and responsive websites. On the other hand, ASP.NET Web API is a framework that focuses on creating APIs for web and mobile apps to consume.

What is the difference between ASP.NET and ASP.NET Core?

ASP.NET Web App

ASP.NET Web App is a comprehensive solution for building full-fledged web applications. It comes with a rich set of features and boilerplate code that simplifies the development process. This includes support for modern web development patterns like Razor Views, Model-View-Controller (MVC), and Web API for building APIs within the app.

It's an ideal choice when you need to create a complete web application with features like user authentication, session management, and cross-browser compatibility out-of-the-box. It also offers a integrated development experience with Visual Studio or Visual Studio Code.

Razor Views

two screens showing the same web application as they appear to be in different stages of development

ASP.NET Web App leverages Razor Views, a light and expressive templating engine, to create dynamic HTML pages. Razor allows you to mix C# code with HTML markup, making it easier to create rich UI components with minimal code.

For instance, you can create a simple 'Hello World' page in Razor like this:


    @{
        string message = "Hello, World!";
        }
  
      @message

ASP.NET Web API Tutorials For Beginners and Professionals

`MVC Architecture`

ASP.NET Web App follows the Model-View-Controller (MVC) architectural pattern, separating an application into three main components: Models, Views, and Controllers.

This separation allows developers to work independently on the data, business logic, and UI, promoting reuse and improving maintainability. For example, you can have multiple views binding to the same model, or change the view without altering the model or controller.

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`ASP.NET Web API`

ASP.NET Web API is a lightweight solution that focuses solely on creating APIs using HTTP services. It's designed for building RESTful services that can be consumed by a plethora of clients, from web and mobile apps to IoT devices.

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When you need to separate your API layer from your web application, or expose your application's functionality as APIs to third-party clients, ASP.NET Web API shines. It provides features like routing, model validation, and comprehensive support for HTTP requests.

`RESTful API`

Web API is specifically designed to expose RESTful services. It provides built-in support for HTTP methods (GET, POST, PUT, DELETE, etc.) and automatically maps them to controller actions.

Here's a basic example of a RESTful API controller in Web API:


  
    public class ValuesController : ControllerBase
      {
          [ApiController]
          [Route("api/[controller]")]
          public class ValuesController : ControllerBase
          {
              // GET api/values
              [HttpGet]
              public ActionResult> Get()
              {
                  return new string[] { "value1", "value2" };
              }

              // GET api/values/5
              [HttpGet("{id}")]
              public ActionResult Get(int id)
              {
                  return "Value";
              }

`API Versioning`

Web API supports API versioning out-of-the-box with the use of media types. You can create different versions of your APIs that can coexist and serve different clients.

For example, adding the 'Accept' header to a request like 'Accept: application/json; version=2.0' can serve the specific version of the API.

In the .NET ecosystem, choosing between ASP.NET Web App and Web API ultimately depends on your project's requirements. For comprehensive web applications, ASP.NET Web App is a robust choice with rich features. On the other hand, for exposing services as APIs or decoupling API layers, ASP.NET Web API excels. Each serves a unique purpose and together, they form a powerful duo for building modern web applications and services.