![]() ![]() All HTML elements inside the root element were rendered on the server:Īs the browser doesn’t have to render the HTML, static content appears on the page faster with server-side rendering. Here’s an example HTML file, containing a simple newsletter signup form, that the browser could receive with server-side rendering. This is done by using a backend runtime such as Node.js that can run the JavaScript code to build the UI components. SSR generates the static HTML markup on the server so that the browser gets a fully rendered HTML page. Server-side rendering, also known as universal or isomorphic rendering, is an alternative rendering method for single-page applications. Server-side rendering provides a solution to this problem. This leads to a poorer user experience and higher bounce rates (see Google’s discussion of how page load time impacts bounce rates). Since the browser needs to download and run the whole application code before the content appears on the screen, the first page load is usually slow with client-side rendering (server-side rendering splits this process between the client and server).Īs a result, users see a blank screen or loading spinner for a relatively long time. The root element is populated by the browser that downloads and processes the JavaScript bundle to render all the other elements: No server is involved in the process, except to store the client-side code and data and transfer it to the browser.Īs the following code example shows, in CSR apps, the HTML file only contains a blank root (often also named app) element and a script tag. If you use client-side rendering, it’s the user’s browser that generates the entire app, including the user interface (UI), data, and functionality. ![]() The browser then takes the generated HTML to visually render the page. With client-side rendering, this is always done on the frontend. The page HTML is generated by a JavaScript engine. ![]() In web development, rendering means the process of converting application code into interactive web pages. How does client-side rendering work? Ĭlient-side rendering (CSR) is the default rendering method for single-page applications. ![]() As SPAs only have a single HTML page that fetches data from the server asynchronously, users can see updates instantly, without having to wait for the whole page to refresh. The main goal of this architecture is to make web apps similar to native mobile and desktop applications in terms of interactivity. They consist of reusable JavaScript components fully rendered on the client side. Modern-day SPAs are often built with frontend UI frameworks such as React, Vue, and Angular. SPAs, also known as client-side apps, became possible with the introduction of asynchronous JavaScript (AJAX), which makes it possible to update smaller parts of the user interface without reloading the full page. Single-page applications (SPAs) are a web app architecture that appeared as an alternative to traditional websites and multi-page applications. An overview of single-page applications We’ll see how it works, what problems it solves, how it compares to client-side rendering, and what pros and cons it comes with. In this article, we’ll look into server-side rendering in detail. However, sometimes it can be difficult to implement and might also increase First Input Delay. Server-side rendering improves site speed and results in better Core Web Vitals scores. In contrast to client-side rendering, it generates static content on the server before sending it over to the user’s browser. Server-side rendering (SSR) addresses the performance and search engine optimization issues of single-page JavaScript applications. ![]()
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