Why Frontend Testing Is Crucial for Your Web Application's Success

    Building a web application can be an arduous process. Whether it’s for consumer-facing or enterprise applications, there are a few common goals that every developer wants to achieve when building an application. Some of these are application features, performance, and scalability. However, one of the most overlooked aspects of application development is testing. Developers often tend to prioritize backend testing thinking that it is the most crucial aspect of the application. However, it’s the frontend that users interact with, making frontend testing a crucial aspect of the development process. In this article, we will discuss why frontend testing is critical for your web application's success and how to go about it.

    The Importance of Frontend Testing

    So why is frontend testing so important? Let us consider an example. Imagine that you have built a web application for a large airline and you are in the final stages of the development process. All that’s remaining is testing to ensure that everything is working perfectly. During this period, you may decide to forego frontend testing, thinking that it isn't necessary. However, you will have missed the fact that a small bug in the frontend can cause significant problems for your application. Your user experience can be ruined by an error message or broken links, making it nearly impossible for customers, such as airline passengers, to complete transactions. When a customer encounters these problems, they may lose confidence in your application and switch to a competitor.

    When you take a look at some of the most popular applications that are used today, such as Amazon, Facebook, and Twitter, you’ll notice that they all have one thing in common. They carry out extensive frontend testing to ensure that the user experience is impeccable. If an error is found, they fix it immediately, ensuring that it doesn't cause issues for their users.

    Therefore, to make sure your application is a success, you need to prioritize frontend testing. That means testing not just the functionality of the unit or module but also every aspect of the user interface or user experience. By doing this, you can pinpoint any errors that you may have missed during the development process and correct them before launching the application.

    Types of Frontend Testing

    Now that we know why frontend testing is crucial, let’s discuss the types of frontend testing you can perform. Frontend testing is divided into four categories:

    • Unit Testing: This type of testing is carried out to verify that a specific component or feature of the application is functioning as intended
    • Integration Testing: Integration testing ensures that all the components of the application work together harmoniously and in sync
    • Functional Testing: Functional testing checks the application's functionality from a user's perspective to ensure that it is working correctly
    • End-to-End Testing: End-to-end testing validates an application's performance from start to finish for a specific user scenario

    Tools for Frontend Testing

    Now comes the question of what tools you can use for frontend testing. Some tools can help you implement automated tests to save time and increase the accuracy of the tests performed on your application:

    • Jasmine: Jasmine is a behavior-driven development framework for threaded testing of JavaScript code. It can be used with any library or framework, making it highly versatile.
    • Mocha: Mocha is another frontend testing tool that runs in the browser and the command line. It offers easy asynchronous testing, among other features.
    • Selenium: Selenium is a widely-used frontend testing tool that can test web applications in various languages and frameworks. It can also be used with a range of programming languages.
    • Protractor: Protractor is an end-to-end testing framework for Angular and AngularJS applications. It is an open-source tool that is designed to be easy to use with minimal setup.

    Benefits of Frontend Testing

    There are numerous benefits to carrying out frontend testing on your web application. These are:

    • Improved user experience: Frontend testing ensures that the application is user-friendly, which improves the user experience.
    • Decreased costs: Resolving frontend issues during the development process can save you considerable time and resources during the application’s lifetime.
    • Better scalability: Scalability is enhanced by conducting frontend testing, which can maintain the application’s compatibility across multiple browsers/devices.
    • Increased confidence: Frontend testing ensures that the application is compatible with different browsers and devices, resulting in increased confidence from the end-users.

    Common mistakes in Frontend Testing

    Despite knowing the importance of frontend testing, dev teams often make the following mistakes:

    • Insufficient and poor testing: Conducting insufficient and poor testing can lead to numerous issues post launch. Therefore, testing needs to be carried out consistently throughout the application’s development cycle.
    • Testing too late: Testing should be carried out at every stage of development, including during the design and coding process, not as an afterthought.
    • Ignoring edge cases: Some features may not function as expected for users who may push the limits of the application's functionality. It is essential to identify and test how the application performs under different edge cases.


    Frontend testing is a critical element of web application development, and it should not be overlooked. Proper testing can help you to identify potential issues early in the process, which can save you time and resources in the long run. By prioritizing frontend testing, you can guarantee an exceptional user experience, thereby increasing usage and trust from your users. It is also essential to use the right tools to ensure that you get accurate results. When done consistently and strategically, frontend testing will not only make your web application a success, but it can also put your development team ahead of the game.

    © 2023 Designed & Developed by José Matos.