I'm curious, what problems did isomorphic JavaScript applications emerge to solve? While server-side rendering is often talked about in terms of SEO, what are the advantages in terms of performance or development process? What do those who generally don't prefer it look at, I wonder?
Is JavaScript Isomorphic really necessary?
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Ah, there’s actually a whole story about this. Last year, while working on a Next.js project, we initially went with client-side rendering. Since the project was small, we didn’t run into any SEO issues, and performance was decent. But then the client said, "We want to be more visible to search engines," and that’s when I really saw the power of isomorphic rendering.
The performance difference was huge... With client-side rendering, the initial load time could stretch to 3-4 seconds because the browser had to load all the JavaScript. But with server-side rendering, the first paint happened almost instantly. We improved both user experience and SEO without sacrificing performance—and thanks to Next.js, the development process was even cleaner!
Of course, I get why some people don’t prefer it. For small projects, the boilerplate and complexity can feel overkill. Or some might think, "I only build static sites—why bother?" But for growing applications, especially in fields like MLM or e-commerce, the advantages of isomorphic rendering are undeniable. For me, it’s now the standard.
The biggest advantage of Isomorphic JavaScript is that it simplifies the development process by allowing the same code to run on both the client and server sides. Especially when working with large teams, managing state or routing in the same way across both sides saves tons of time during debugging. I’ve worked on a project like this in the past using React, and when combined with server-side rendering, it not only improved SEO but also reduced the time I’d spend debugging issues like "Why isn’t this working?"
However, some people are right to prefer not using it because it can add overhead. For example, managing side effects in Node.js during development or not guaranteeing the same behavior across different environments (browser vs. Node) can be frustrating. In my team, some developers decided, "If we’re already a SPA and SEO isn’t critical, there’s no need to go the isomorphic route," and stuck with client-side rendering. But as I said, every case is project-specific—if SSR has performance benefits (like faster first paint times), it’s worth considering.