How to Build a Single-Page App with React?

React is a JavaScript library that lets us build interfaces using components. The goal of this article is to help you get started with React and be able to build your own single-page application – so let’s get started!

Whether it’s for a web application, a mobile app, or even for your personal project, you may find that single-page applications offer the best performance. But what is a single page application? In this tutorial I’ll show you how to build a Single Page Application using React – which can be handy if you want to create an interactive trivago hotel page!


A single-page application (SPA) is a web application or website that interacts with the user by dynamically rewriting the current page rather than loading entire new pages from a server. This approach makes it possible to create rich, fast, and responsive applications that feel native-like to the user.

React is a popular JavaScript library for building user interfaces and SPAs. In this article, we’ll show you how to use React to build a simple SPA.

How React performs better in SPAs

React is a JavaScript library for building user interfaces. It is the view layer of an application, meaning it is responsible for how the user sees and interacts with the app.

When building a single-page app, React provides a number of benefits over other frameworks:

1. Increased performance
2. Better organization of code
3. Simplified development process

Overview of the tutorial

In this tutorial, we’ll show you how to build a single-page app with React. We’ll cover the basics of React, including its core concepts, and we’ll show you how to create a simple React component. By the end of this tutorial, you’ll be able to create a basic React app that will render a simple component on the page.

Building the Single Page App (SPA) with React:

Building the Single Page App (SPA) with React:

Now that we have our project skeleton set up, it’s time to start building out our single page app. We’ll be using React for this, so our first step is to install the React library.

With our project open in our text editor, we’ll head over to the command line and enter the following:

$ npm install --save react react-dom

This will install both React and the ReactDOM libraries, which we need in order to actually render our React components into the DOM. With that installed, we can now create our first component. In your src/ directory, create a new file named App.jsx and add the following code:

import React from 'react'; class App extends React.Component { render() { return (<div>Hello, world!</div>); } } export default App;

Frontend – HTML, CSS, and AngularJS

If you’re looking to build a single-page app with React, there are a few things you’ll need to keep in mind. For starters, you’ll need to make sure your React code is up to date with the latest version of React Router. Additionally, you’ll need to make sure that your HTML5 and CSS3 code is valid and well-formed. Finally, if you’re using AngularJS in your project, you’ll need to make sure that it’s compatible with React Router as well.

Backend – Node.js, Express, and MongoDB

When it comes to single-page applications, the backend is just as important as the frontend. In this article, we’ll be discussing how to build a backend for a React application using Node.js, Express, and MongoDB.

Node.js is a JavaScript runtime that allows you to run JavaScript on the server-side. This means that you can use Node.js to build your backend and use JavaScript for both your frontend and backend code. Express is a web framework for Node.js that makes it easy to create a REST API. MongoDB is a document-oriented database that stores data in JSON-like documents.

Building a backend with Node.js, Express, and MongoDB is relatively simple. First, you’ll need to install Node.js and MongoDB on your computer. Then, you’ll need to create a new project directory and initialize it with npm init . Next, you’ll need to install Express and Mongoose (an Object Data Modeling library for MongoDB).

Once you have all of the dependencies installed, you can start building your backend code. First, you’ll need to set up your Express server. You can do this by creating a new file named server.js and adding the following code:

const express = require('express'); const app = express(); const port = 3000; app.get('/', (req, res) => { res.send('Hello World!'); }); app.

How to build a single-page app using React?

To build a single page app using React, follow the steps mentioned below:

1 – Create a react app in your desired location using the following command:

npx create-react-app app-name

A directory called app-name is created with the following default files:


├── node_modules

├── package.json

├── .gitignore

├── public

│   ├── favicon.ico

│   ├── index.html

│   ├── logo192.png

│   ├── logo512.png

│   ├── manifest.json

│   └── robots.txt

└── src

    ├── App.css

    ├── App.js

    ├── App.test.js

    ├── index.css

    ├── index.js

    ├── logo.svg

    └── serviceWorker.js`

2 – Install react-router-dom for routing requests by executing the following command:

npm install react-router-dom

3 – Wrap the App component.

There are two types of React routers, BrowserRouter (makes URLs like and HashRouter (makes URLs like We re using BrowserRouter in this example and use it to wrap the App component.

Your src/index.js file should include the following code:

import React from 'react'
import { render } from 'react-dom'
import { BrowserRouter } from 'react-router-dom'
import App from './App'
    <App />

4 – Create a file named src/pages/HomePage.js with the following code:

import React from "react";
export default function HomePage() {
return (
<h1>Hey from HomePage</h1>
<p>This is your awesome HomePage subtitle</p>

5 – Create a file named src/pages/UserPage.js with the following code:

import React from "react";
import { useParams } from "react-router-dom";
export default function UserPage() {
let { id } = useParams();
return (
<h1>Hello there user {id}</h1>
<p>This is your awesome User Profile page</p>

6 – Decide and incorporate the routers that you want to use using Switch and Route. Switch groups all routes together and ensures that they take the precedence from top-to-bottom. Route, on the other hand, defines individual routes.

Your App.js file should include the decided routes.

import React from 'react'
import { Route, Switch } from 'react-router-dom'
// We will create these two pages in a moment
import HomePage from './pages/HomePage'
import UserPage from './pages/UserPage'
export default function App() {
  return (
      <Route exact path="/" component={HomePage} />
      <Route path="/:id" component={UserPage} />

The above code matches the root route (/) to HomePage and matches other pages dynamically to UserPage.

7 – Link to a page within the SPA using Link.

In the src/pages/HomePage.js file, include the following code:

import React from 'react'
import { Link } from 'react-router-dom'
export default function HomePage() {
  return (
    <div className="container">
      <h1>Home </h1>
        <Link to="/your desired link">Your desired link.</Link>

You can now run the code and view the development server available at http://localhost:3000.

Why choose a single-page application?

There are a number of reasons to choose a single-page application over a traditional multi-page application. Single-page apps are generally more responsive and fast, as there is no need to reload the page with each new action. This can lead to a better user experience, as users can perform actions quickly and without interruption.

Single-page apps also tend to be more scalable than traditional multi-page apps. This is because there is only one page to load, so the app can handle more traffic without performance issues. Single-page apps are also easier to develop and deploy, as there is only one page to manage.

If you’re looking to build a fast, responsive, and scalable web application, then a single-page app is a great choice.

When not to use single-page applications?

Single-page applications are not a good choice for every project. If you need to support older browsers or devices with limited resources, a single-page app may not be the best option. Also, if your content is not well suited to an AJAX style of loading and updating, a single-page app may not be the right choice.

The component life cycle

React is a JavaScript library for building user interfaces. It lets you create reusable components so that your code is easy to read and maintain. When you’re building a React app, you’ll need to think about the life cycle of your components.

The component life cycle refers to the sequence of events that happen from when a component is created until it is destroyed. There are three main phases to the life cycle:

1) Initialization: This is where we set up our component before it is rendered. We can do things like set initial state or bind event handlers in this phase.

2) Rendering: This is where our component actually gets rendered to the screen. We can access the DOM in this phase and make changes if necessary.

3) Cleanup: This is where we clean up our component after it has been unmounted from the DOM. We can remove event listeners or perform other cleanup tasks in this phase.
The component life cycle is important to understand because it can help you optimize your components and avoid memory leaks. It can also be helpful in debugging your code.


Building a single-page app with React is a great way to improve your web development skills. Not only will you learn how to use React, but you’ll also get practice working with the various tools and libraries that are needed to build a complete app. By following the steps in this article, you’ll be well on your way to creating your first single-page app with React.

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