The emergence of single page applications (SPA) has been gaining traction in recent years. This type of application provides a more intuitive and interactive experience for users. But with the introduction of client-side rendering in Angular2.x, comes the question: how will server-side rendering work? Will it be complex? Does it require additional overhead for development? What changes need to be made in order to remain efficient? These are just a few of the questions circling around the prospects of server-side rendering in Angular2.x.
Developers who decide to incorporate server-side rendering to their applications need to consider the increased complexity and overhead it comes with. For instance, it requires the duplication of state between the backend and frontend, leading a higher initial cost for development. On the other hand, without server-side rendering, developers are confined to using client-side rendering alone. This leads to longer loading times and decreased user experience, compromising the performance of the application over time.
In this article, you will learn about the realities of server-side rendering in Angular2.x. First, it will analyze the benefits and drawbacks. Then, it will shed light on the changes needed to be made in client-side rendering architecture in order to make the most of server-side rendering. Finally, it will provide a step-by-step guide for setting up and using server-side rendering in Angular2.x applications. With this article, developers will be able to understand whether server-side rendering can be a viable alternative for their applications.

Definitions of Server-side Rendering in Angular2.x

Server-side rendering: Server-side rendering is a process where the code running on the server is used to generate a webpage. This technology is used when creating applications with JavaScript libraries such as Angular2.x so they can be viewed properly on web browsers. This helps to ensure that all components of a website are visible to the user.
Angular2.x: Angular2.x is a JavaScript framework developed by Google for creating single-page web application. It is mainly used for building client-side applications, but can also be used to render HTML on the server-side with the help of server-side rendering technique.
Single-page web application: Single-page web application (SPA) is a web application that works inside a single page. All data is loaded dynamically and no page refresh is required throughout the application. This increases the speed and responsiveness of the application drastically.
Web browsers: Web browsers are applications which are used to view and interact with webpages. Popular web browsers include Google Chrome, Mozilla Firefox, Safari, Microsoft Edge and many more. They interpret HTML, JavaScript and other technologies, so that users can view elements of a website or application.
HTML: HTML (HyperText Markup Language) is a markup language used to define the structure and content of a web page. HTML elements are placed inside tags, and are used to format text, display images, embed audio and video, create interactive forms and much more.
Server-side rendering in Angular2.x is a useful technology for ensuring that all components of a website or application are visible on web browsers. Even though most of the work is done on the client-side, there are times when server-side rendering is necessary in order to get the most out of Angular2.x. By understanding the key definitions of server-side rendering, developers can make full use of Angular2.x and create a better experience for their users.

Overview of Server-Side Rendering in Angular2.x

Server-side rendering (SSR) in Angular2.x can be used to significantly improve the performance of web applications. With SSR, the browser’s main thread is offloaded from having to compile and process large amounts of client-side code, greatly increasing the time-to-interactive and first meaningful paint for the page.

Rendering Process

The first step in SSR is the renderer. The renderer is the code that actually creates the HTML file that is sent down to the browser. In Angular2.x, the renderer is written in TypeScript. It works by taking the Angular app and running it through the compile and render process to generate the HTML. This process includes running the data through the template compiler, the code generator, and the renderer.

Differences between client-side & server-side rendering

The differences between client-side and server-side rendering are related to how the content is generated and the performance implications. Client-side rendering loads only the primary HTML page and JavaScript files. As a result, the page is generated and rendered quickly but the interactive elements take longer to arrive on the page. Server-side rendering, on the other hand, generates all of the content before sending it to the browser, allowing the interactive elements to load quickly. This results in a faster time-to-interactive for the page.
In addition, server-side rendering offers better SEO performance as the content is already available when the crawlers arrive.

  • Faster time-to-interactive
  • Reduced client-side processing
  • Increased SEO performance
  • Faster delivery of interactive elements

Benefits of Server-Side Rendering in Angular2.x

Server-side rendering (SSR), also known as Universal Rendering, is a term that describes the process of rendering code on the server rather than on the browser or device. This enables Angular2 apps to be indexed and rendered by search engines like Google and Bing.


The biggest advantage of server-side rendering is the improved performance that comes with being able to render the entire page on the server. Since server-side rendered pages don’t rely on downloading JavaScript to display content, the page can be loaded much faster. This could result in a better user experience and a better ranking by search engines. Additionally, the reduced amount of data that needs to be downloaded by the browser, as there’s no need to download all the JavaScript just to render the page, increases the performance of the page when loading.


Using server-side rendering has a few drawbacks though. The most obvious drawback is the increased server load due to having to render the page every time it is requested. Also, since the browser is not actively involved in the rendering of the page, the use of modern features such as Web Components may be hindered, as the browser will not understand those components. Additionally, most server-side technologies are not as fast as client-side ones, making the page slower to render than it would have been had it been rendered on the browser.

Server-side rendering is a powerful technique for optimizing Angular2 apps, allowing them to be indexed and rendered by search engines. However, users must consider both the advantages and disadvantages that come with server-side rendering as it is not the right solution for every situation.

Challenges of Server-Side Rendering in Angular2.x

Server-side rendering in Angular2.x is a challenging task due to its dynamic nature. Angular2.x is based on components and directives, as opposed to static pages. This means that server-side rendering needs to be performed on a component level in order for the application to be rendered correctly. In addition, the application needs to be able to dynamically change the data/structure of a component at runtime.

Angular2.x Lifecycle Considerations

The lifecycle of Angular2.x components can also be problematic when considering server-side rendering. Components are not executed on the server side and therefore need to be re-executed on the client side for any changes to their state. This means that any initial state that is set on the server side needs to be retrieved and the component needs to be re-executed with this initial state. The issue is further compounded when a component utilizes services such as routing which involves initializing the router with specific configurations.

Data Transfer and State Conservation

When it comes to data transfer between the server and the client, the process must be optimized in order for the application to remain performant over the network. Optimizing the transfer of data requires the use of lazy loading techniques as well as using view caching techniques to avoid unnecessary data transfers. In addition, the state of the application must be conserved in order for the client-side application to remain responsive. This requires the use of techniques such as observable streams and state serialization to ensure that the application was restarted with the same view state.
Overall, server-side rendering in Angular2.x can be seen as a challenging task due to the dynamic nature of the framework and the overall architecture of the application. Although there are software solutions that attempt to perform server-side rendering, additional steps must be taken to optimize the performance and accuracy of the application. These steps require the development team to have knowledge of the internal workings of the framework as well as optimizing the data that is transferred between the server and the client.


Thought-provoking question: How can developers use server-side rendering to enhance their Angular2.x applications?
Using server-side rendering is becoming more and more popular with the rising popularity of Angular2.x applications. This allows for more dynamic and engaging user experiences, as content can be updated in real-time with minimal effort. If you’re interested in learning more about how best to utilize this new technology, we suggest following our blog to keep up with the latest releases concerning server-side rendering for Angular2.x.

So we’ve put together a FAQ section to help answer some of the most common queries about server-side rendering with Angular2.x: What exactly is server-side rendering? Server-side rendering is a way for a website or application to render pages directly from a web server and thereby improve the speed and reliability of the website or application. What are the advantages of using server-side rendering? Server-side rendering brings a number of advantages, including increased speed and responsiveness, better compatibility with modern web standards, easier maintenance and more efficient distribution. What frameworks support server-side rendering? Of the major frameworks, both Angular2.x and React support server-side rendering. Are there any downsides to using server-side rendering? Server-side rendering tends to require more work upfront, and the resource requirements can be a bit higher than usual. Also, certain approaches can be more difficult to debug and maintain. What should I expect when making the switch to server-side rendering? Expect to have to invest some time in understanding the basics of server-side rendering and in adapting your existing codebase. But with a bit of patience and determination, you should find that the results more than make up for the effort.

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