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Understanding The Single-Page Application Architecture

Single-page application (SPA) architecture is becoming more prevalent in the web development industry. Let's see how they work and how they can benefit you.

Written by RamotionSep 26, 202216 min read

Last updated: Feb 20, 2024

As web apps become more and more complex, we've seen the rise of client-side frameworks that help us create dynamic UIs. Examples include ReactJs and AngularJs. While HTML5 and JavaScript can be used to produce great apps with smooth interfaces and animations, one noticeable drawback is a lack of real-time updates on the server. This can make building a complex application tedious, especially if you want to reuse code as much as possible. To solve this problem, single-page applications (or SPA) have emerged out of the need to provide real-time updates on the server while still using a front-end framework.

In today's fast-paced, technology-driven world, everyone is looking for the shortest way to accomplish a task. This has led to a surge in the popularity of Single-Page Applications (SPAs). The SPA offers several advantages when compared to traditional multi-page applications. For starters, SPAs provide faster user experiences by decreasing the number of server requests and allow app developers to focus primarily on code that is core to the application.

A growing amount of companies and web application agencies are adopting this pattern. This may be because of its scalability and ability to create a great user experience. What exactly is a single-page application architecture? Is it beneficial to you?

Single Page Application Definition

Single-page applications (SPAs) are web applications that load a single HTML file and dynamically rewriting that page as the user interacts with it. All subsequent interaction is done through JavaScript and AJAX calls to a server backend that handles data persistence and business logic. This approach contrasts with the more traditional multi-page approach, where each change to the user interface (UI) causes a new page to be loaded from the server.

Single Page Application

In a SPA, all the content is loaded initially. This includes all the HTML, CSS, and JavaScript needed by the app. Once it's loaded, only small changes are made to that page when required, such as when the user clicks on a link or submits form data. These events trigger changes at a higher level of the page which then cascade down to update only those parts of the page that need changing. This means there is only one request from your browser for each page load and no further requests until some event occurs that requires you to refresh the page (such as clicking on a link).

The advantage of using this technique is that it allows the developer to create a smooth, fast user experience. This is because there are no requests for unnecessary data, and the page loads quickly. However, this comes at a cost; the developer must create a server-side script that manages all of these changes through AJAX. This can be difficult to get right and will require more time and effort than simply using traditional web development techniques.

The most common approach to building SPAs is to use client-side JavaScript frameworks like Angular or React to render the initial page, while loading content via AJAX requests as needed. This has become popular because it allows developers to create rich user interfaces without having to deal with the complexity of maintaining multiple pages.

The main difference between SPAs and traditional web applications is that SPAs don't reload the entire page when some action triggers changes in the document object model (DOM). Instead, they use AJAX to make asynchronous requests for new information and update only those parts of the DOM that have changed since the last time you loaded them.

Advantages and Disadvantages of Single Page Applications

Single Page Applications (SPA) are gaining popularity as an alternative to traditional web applications. They are often perceived as faster, more secure, and more user-friendly than other types of applications. Let's look at some advantages and disadvantages of Single Page Applications.

Advantages of SPAs

1. Speed and Performance

Speed and Performance

Single-page applications are super fast. They load faster and feel more responsive than traditional websites because they don't reload the entire page each time you click a link or submit a form. This is mainly due to the fact that all the content is loaded in one go, rather than being downloaded piece by piece as it's requested. Also because they send fewer requests over the network, which reduces latency. In addition, because they only load a single HTML page, they don't require multiple round-trips to fetch all of the content needed to render the application. This makes them ideal for mobile devices where network bandwidth is limited and users expect fast response times.

2. Improved user experience

Improved UX

The user experience of a single-page application is significantly better than that of a traditional website. For example, if you want to filter your list of movies by genre and then sort them by release date, with a traditional web application you would have to click through several pages in order to do so. With a SPA, however, all this information can be displayed on one page without reloading it or having to navigate away from the initial query.

3. Single Page

Single Page

Single page applications consist of one single HTML page that loads and renders everything needed for the application's initial state. This means that, when a user navigates to the page in their browser, they will see a fully interactive version of the application without having to load anything else. This is great because it reduces the time it takes users to get started with your app and eliminates any need for them to wait around while content loads.

4. Reduced load time

Reduced load time

Reduced load time for subsequent pages, Single page applications are often built with a data-driven approach and use AJAX to load content when needed, rather than loading all of the data upfronts. This means that subsequent pages can be loaded much faster because they do not need to fetch all of the data again; instead, they just pull in what they need when they need it. This is also a great feature for users because it means that they do not have to wait around while your application loads new pages. Allowing people to get started with your app as quickly as possible will reduce the friction involved in using it and make them much more likely to stay engaged.

5. Reduced server load

Reduced server load

When you are using AJAX to load content, you do not need to hit the server for every action. Instead, you can use the data that is already stored in your browser’s cache and just ask it for what you need. This means that each user will only have to make one request per page, which will reduce server load significantly. This is especially important if you are running a high-traffic website, as it will help to ensure that the server does not become overloaded. It also means that your users will be able to access your site more quickly and easily.

Disadvantages of SPAs

1. Not great for SEO


One of the biggest disadvantages of AJAX is that it can have a negative effect on your website’s search engine optimization. This is because crawlers are unable to see the content that has been loaded via AJAX, which means that they will not be able to index it properly. This can make it difficult for users to find your site via search engines. Additionally, it can also mean that you miss out on any potential traffic from those who arrive at your website via search engines. There are some workarounds for this issue but they are not always easy to implement.

2. Security issues

Security issues

Single page applications rely on the server for authentication and authorization. This means that the application is vulnerable to authentication attacks such as Cross-Site Request Forgery (CSRF) and Cross-Site Scripting (XSS). These attacks can be used to steal user credentials or inject malicious scripts into the application. The only way to mitigate these risks is to implement additional security measures such as stateless authentication and CSRF protection.

3. Won't work without JavaScript

Single page applications rely on JavaScript for rendering the user interface. This means that the application will not work at all if a user disables or does not have JavaScript enabled in their browser. This can be a problem if you want to support users who may not have JavaScript enabled. You should implement fallback solutions, such as progressive enhancement and server-side rendering.

4. Heavy usage of browser resources

Single-page applications are very resource-intensive. They require a lot of JavaScript code to run and can consume large amounts of memory. This can cause issues for users with low-end devices such as smartphones, which may not have enough resources to run the application smoothly. You should implement techniques such as lazy loading and code splitting to reduce the size of your application when deployed on production servers.

5. Possible memory leaks

Some JavaScript frameworks, including React and Angular, are known to have memory leaks. These can be caused by using functions that don’t clean up after themselves or by not properly disposing of objects that are no longer needed. You should avoid these issues by following best practices when coding.

6. Poorly-optimized code

If you’re not careful, your application can start to slow down over time as it becomes larger and more complex. You should look for ways to optimize your code so that it runs faster, such as using lazy loading and code-splitting techniques.

Best Framework for Single Page Applications

Single page apps are a hot topic in the web development sphere right now. But, with so much technology available, it can be tough to choose which framework is right for your project. It's not enough to just look at the features, you need to understand how to use them. So I've hand-picked four of the most commonly used single-page application frameworks.

The most common frameworks to build Single Page Web Applications are React, Angular, Vue, Ember, and Backbone.

1. React


ReactJs is a JavaScript library created by Facebook to build user interfaces. It’s commonly used for building user interfaces for web and mobile applications. React makes it easy to create interactive UIs by composing pure components. It uses a virtual DOM that compares itself with the real DOM, only updating what needs to change when data changes instead of re-rendering everything on every update.

React is a great choice to build web applications because it’s easy to learn and has a low learning curve. It also has an extensive ecosystem of plugins and tools that you can use to build complex applications faster than with other frameworks. In addition, it’s one of the most performant frameworks available today.

2. Angular


AngularJs is a JavaScript framework developed by Google to build web applications. It uses two-way data binding to synchronize models and views, making it easier to build interactive, responsive user interfaces. AngularJS comes with many built-in features such as form validation, dependency injection, routing, and more. It also supports a lot of third-party libraries to extend its functionality. It has gained a lot of popularity in recent years due to its ease of use and performance.

It is also used by large companies such as Google, Netflix, and Microsoft. Its popularity can be attributed to its performance and ability to handle large applications with ease. It is one of the top choices for JavaScript frameworks, and it is used by many developers in their projects.

3. Vue


VueJs is an open-source JavaScript framework developed by Evan You. It’s a progressive framework that can be used in single-page applications or websites. Vue provides data binding, routing, and other features that make it easier to build interactive user interfaces. It also supports two-way data binding and comes with a robust ecosystem of tools, libraries, and plugins. It’s a very flexible framework that can be used in a number of ways. It’s also very easy to learn and has a low learning curve, which makes it popular among developers.

4. Ember


EmberJs is another popular framework for building web applications. It was created by Yehuda Katz in 2011, and since then it has been updated regularly with new features. Ember is designed to help developers create large-scale single-page applications that work consistently across different devices. It supports two-way data binding, which makes it easier to develop applications with a rich user interface. Ember also comes with an ecosystem of tools, libraries, and plugins that can be used to extend the framework’s functionality.

5. Backbone


BackboneJs is a lightweight JavaScript framework that allows you to build single-page applications. It lets you organize your code into models, views, and collections that can be synced with a server. Backbone’s main focus is on application architecture and data binding, as well as providing an API for interacting with the browser’s DOM elements. The library also comes with tools for routing, templating, and validation of forms.

Backbone is extremely popular and has a large community that’s constantly contributing to the library. It’s also one of the oldest frameworks that are still actively maintained. Backbone is a great choice if you need to build a small application that can be easily maintained. But it might not be the best option for large-scale projects.

Features of Single Page Application Architecture

The following are some of the features of single-page application architecture:

1. Reducing repetition

The single-page application architecture reduces repetition by using the same code on multiple pages. The code is only loaded once and then referenced from there, which eliminates the need to load it again. This allows for faster page loads since there is less data being transferred across the network. For example, if you have a web page with a header, then a sidebar, and a content area, it is possible to load the same code for each area. The only thing that changes when switching between pages is which data is displayed in each section.

This feature is especially useful for websites that have a lot of pages. For example, if you run an e-commerce site that has hundreds or thousands of products to sell, it can be time-consuming to load each page separately. Instead, with single-page application architecture, you only need to load the code once and then reference it from there.

In addition to this, single-page applications are easier for the user to navigate because there is no need of full page reload. The user can simply click on whatever element they want and it will load instantly. This is particularly useful when building a website where users can add items or make changes while they are in the middle of browsing.

2. A desktop application-like experience

Single-page applications are a great way to provide a desktop application experience on the web. This can be particularly useful if you are building a web application that requires the user to spend a lot of time accessing the same information over and over again. This can be frustrating for users who try to do this on a traditional website because they have to keep clicking on the “back” or “forward” buttons every time they want to go back to the previous page. With single-page applications, there are no refresh buttons or links; instead, all that is needed is for the user to click on the element they want and it will load instantly.

Single-page applications are also great for mobile devices. This is because they do not require a user to download an app and instead can be accessed by simply going to the website on their phone.

3. Building PWA made easy with SPA

Single-page applications are extremely beneficial and can be used to build a progressive web app (PWA) in order to make the development process easier. A PWA is a website that uses modern web technologies to provide an app-like experience for users. The main features of PWAs include being responsive, fast, reliable, and engaging.

Related Posts: Information Architecture, Brand Architecture, Web App Architecture

Examples of Single Page Applications

Single-page applications have been in the spotlight lately, and the trend is expected to continue. Here are a few examples of Single Page Applications:

1. Google Maps

Google Maps

Google Maps is a great example of a single-page application. When you open the app, it shows you an interactive map with a lot of information about your current location. You can also search for other locations and see their respective maps. All this happens on one page without any loading or refresh.

2. Gmail

Gmail is another example of a single-page application. When you open the app, you can see your inbox with all your messages and labels. You can also compose new emails and send them without ever leaving the page.

3. Netflix


When you open the Netflix app, it shows you a list of TV shows and movies that are available for streaming. You can click on any one of them and start watching right away without any loading or refresh.

4. Trello


Trello is a popular project management app. When you open it, you get a list of boards with cards in them. You can click on any card and edit it without having to leave the page.

5. Twitter

When you open the Twitter app, it shows you a feed of tweets. You can click on any tweet and open the page it links to without having to leave the app.

6. YouTube

When you open the YouTube app, it shows you a list of videos that are available for streaming. You can click on any one of them and start watching right away without any loading or refresh.


In a nutshell, the single-page application architecture is all about getting results without reloading the page. This is achieved by creating a single page application (SPA) that loads all of its content at once and uses AJAX to update sections of the page as needed.

The single-page app is qualitatively different from the page-per-request architecture that dominates today's web development. In addition to rethinking the server, there needs to be a shift in how we think about front-end application code. It's not just the way we author our JavaScript, though that's a big part of it. Furthermore, these frameworks take the concept of progressive enhancement seriously: nothing is built into the default view. Everything has to be retrieved over the network and handled asynchronously. It requires a greater level of planning and technical knowledge than many previous solutions; single-page apps are not quick and dirty hacks. There are many ways that you can skin this particular cat, but with great power comes—well—greater responsibility.

Spend some time learning how to build a single-page application (SPA), and consider using it for your next project. It can provide you with more control over your UI and make it more dynamic, in addition to cutting down on the load times of your pages. The good news is that SPAs are easier to build than they may seem, and they can be beneficial to any site that needs a quick, database-driven backend.

The benefits of single-page apps are undeniable. Not only do they provide a seamless, user-friendly experience that makes your site feel faster and more reliable, but they also negate the need for a back-end code base that you would otherwise need to maintain. Adopting a SPA architecture for your next project is not as hard as it may seem, either; there are great tools available that make SPA development easier than ever (and the resources here can help you get started). No matter what kind of application you're developing, whether it's for enterprise applications or consumer websites, you'll have nothing to lose and plenty to gain by adopting a single-page application architecture.

While there are obviously numerous ways to expand upon a SPA, this should give you a broad overview of some of the most important characteristics that any good SPA website will have. The goal is to allow for maximum customization of your app and make it as intuitive to use as possible. If you're looking to create a successful single-page application in the near future, hopefully, the concepts here can assist you in doing so!