Why not to use CSS-in-JS?

Why Not to Use CSS-in-JS?

CSS-in-JS is a popular technique for adding styling to web applications. It enables developers to use JavaScript to write and manage styles, eliminating the need for separate CSS files. While this approach may seem attractive, there are some important drawbacks that must be considered before deciding whether to use CSS-in-JS. In this article, we will discuss why not to use CSS-in-JS and why traditional CSS may be the better option.

What is CSS-in-JS?

CSS-in-JS is a method of writing and managing styles using JavaScript instead of traditional CSS. It enables developers to write styles directly in their JavaScript code, which eliminates the need for separate CSS files. This approach allows for more control over styling and faster iteration times.

Drawbacks of CSS-in-JS

Despite its advantages, there are several drawbacks to using CSS-in-JS that must be considered before deciding whether to use it.

1. Complexity

CSS-in-JS is a more complex approach than traditional CSS, which can lead to longer development times and more difficult debugging. This is especially true for larger projects, where the added complexity can quickly become unmanageable.

2. Poor Performance

CSS-in-JS can have a negative impact on performance. Since the styles are being generated on the fly, the browser needs to process the JavaScript code in order to render the page. This can lead to slower loading times and poorer performance overall.

3. Lack of Browser Support

CSS-in-JS is not supported by all browsers, so it may not be a viable option for projects that need to support older browsers. This can be a major limitation, as it can limit the reach of the project and lead to additional development costs.

4. Limited Tooling

CSS-in-JS has limited tooling compared to traditional CSS. This means that developers may not have access to the same level of debugging and optimization tools, which can lead to a less efficient development process.


CSS-in-JS can be a useful tool for certain projects, but it is important to consider the drawbacks before deciding whether to use it. Complexity, poor performance, lack of browser support, and limited tooling can all be issues when using CSS-in-JS. Traditional CSS may be the better option in many cases, as it provides better performance and more robust tooling.

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