While this technique allows building complex and dynamic UIs with smooth page transitions, it has different pros and cons:
Development speed: When working entirely on the client-side, we don't have to worry about the server compatibility of the code, for example, by using browser-only APIs like the
- Offline: Because code entirely runs in the browser, it can nicely keep working while the internet is unavailable.
- Search Engine Optimization: Indexing and updating the content delivered via client-side rendering takes more time than with a server-rendered HTML document. This is related to the performance drawback we discussed, as search engine crawlers won't wait for the interface to be fully rendered on their first try to index the page. Your content will take more time to show and update in search results pages with pure client-side rendering.
Client-side rendering is a good choice for heavily interactive web applications that don't need indexing or whose users visit frequently. It can leverage browser caching to skip the download phase on subsequent visits, such as SaaS, back-office applications, or online games.
Making a static page interactive in the browser is called "Hydration."
Universal rendering allows a Nuxt application to provide quick page load times while preserving the benefits of client-side rendering. Furthermore, as the content is already present in the HTML document, crawlers can index it without overhead.
- Search Engine Optimization: Universal rendering delivers the entire HTML content of the page to the browser as a classic server application. Web crawlers can directly index the page's content, which makes Universal rendering a great choice for any content that you want to index quickly.
- Development constraints: Server and browser environments don't provide the same APIs, and it can be tricky to write code that can run on both sides seamlessly. Fortunately, Nuxt provides guidelines and specific variables to help you determine where a piece of code is executed.
- Cost: A server needs to run to render pages on the fly. This adds a monthly cost like any traditional server. However, the server calls are highly reduced thanks to universal rendering with the browser taking over on client-side navigation.
Universal rendering is very versatile and can fit almost any use case, and is especially appropriate for any content-oriented websites: blogs, marketing websites, portfolios, e-commerce sites, and marketplaces.
Client-side and universal rendering are different strategies to display an interface in a browser.
By default, Nuxt uses universal rendering to provide better user experience and performance, and to optimize search engine indexing, but you can switch rendering modes in one line of configuration .
In most cases, universal rendering as performed in Nuxt 2 offers a good user and developer experience. However, Nuxt 3 takes universal rendering a step further by introducing hybrid rendering and edge-side rendering.
Hybrid rendering allows different caching rules per route and decides how the Server should respond to a new request on a given URL.
At the moment, every page (or route) of a Nuxt application must use the same rendering mode, client-side or universal. But in various cases, some pages could be generated at build time, while others should be client-side rendered. For example, think of a content website with an admin section. Every content page should be primarily static and generated once, but the admin section requires registration and behaves more like a dynamic application.
Traditionally, server-side and universal rendering was only possible using Node.js. Nuxt 3 takes it to another level by directly rendering code in CDN edge workers, reducing latency and costs.
Nitro is the new server engine that powers Nuxt 3. It offers cross-platform support for Node.js, Deno, Workers, and more. Nitro's design is platform-agnostic and allows rendering a Nuxt application at the edge, closer to your users, allowing replication and further optimizations.