Common Mistakes Web Developers to Avoid in 2021


It is no secret that the website is the backbone of every business. If you want your business to be successful in this digital era, you’ve got to have a well-designed, error free website as potential customers are searching for information via the company’s website. A well-designed and developed website can help you grow your business as a flawless design creates a great impression on your potential customers inducing them to take the desired action.

This article will discuss some common mistakes made by web developers and how to avoid them.
Incomplete Input Validation

Many newbie developers make the mistake of thinking that only HTML and JavaScript validations are enough for user input validation. Always do both Client-side and Server-side Input Validation. A good practice is to share your validators between the backend and frontend.

It is necessary to implement server-side validations for user inputs as well. If you have not done server-side validations, your app will be vulnerable to attacks by hackers such as SQL Injection, which ranks first in the Top 10 Web Application Security Risks.

Cross-Browser Incompatibility

Development processes have a strict timeframe most of the time. As a result, developers tend to use only one browser while developing to test the application. That is ok if you have time later to test it in cross-browsers and fix the issues. Test your web application on multiple browsers. Better to use a tool.

Overusing Libraries

Using many libraries in your application will increase the bundle size and increase the application build time. That will eventually increase page loading time as well. Therefore, be careful when adding many npm packages to your web application. Avoid using libraries if you can write your code with little time to do what the library does. You can check the bundle size of an npm package before adding it to your application by using the BundlePhobia website.

Not Following Responsive Design from the Beginning

Most of developers often make the mistake of not thinking about the responsive design of their web app at the beginning of development. It is crucial to define the breakpoints of the application right at the beginning. Different applications may have different breakpoints depending on the requirements and must be decided at the beginning of the development process.

Mobile-first development is also important for responsive design because it can make the website load faster on small devices.

Skipping Image Optimization

Optimizing image size is essential for reducing the bandwidth usage of your web app. Imagine that your home page has five images and that each of them is 5MB or more. The user won’t wait until that page loads.

Use SVGs for logos, icons, and simple images instead of using JPG or PNG. There are plenty of free-to-use online tools that you can use to optimize JPG and PNG images, so stop skipping image optimization.

Ignoring Technical SEO

Many developers ignore doing Search Engine Optimization (SEO) of the websites or web applications they develop. That could be due to the lack of technical SEO knowledge or lack of development time. But it’s a big mistake to ignore it.

Think about SEO optimization from the beginning.
Not Following Web Standards

There are standards in place to ensure that things are done correctly in a common way. Web standards help developers create apps that will work on the same quality for everyone. Nowadays, most developers are self-taught, and most of the time, they learn from online tutorials. Most of the time, these tutorials do not mention the correct standards, so you end up unaware of them. For example, when writing HTML, you need to use semantic elements to structure your web page according to the web standard.

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Writing Vanilla CSS

It’s 2021 now, and you’re not supposed to write vanilla CSS anymore. Start using CSS preprocessors such as Sass, Stylus, or Less. Or use styled-components (CSS-in-JS) if you’re using react. Developers often make the mistake of ignoring them because of the learning curve.

Start using CSS preprocessor such as Sass/Stylus/Less if you haven’t already

Writing CSS and JS in HTML Files

This is one of the oldest mistakes in the book, but the developers still make it. Sometimes it’s because it was the easier thing to do at the time, but the easier thing to do isn’t always the right thing to do. It’s a bad practice and will make your code messy and very difficult to test and debug. Security vulnerabilities and many more issues can happen.

Always write JavaScript and CSS to separate files and maintain a proper project architecture.