How to Build a Single Page Application (SPA) with React and Redux

Posted on January 31st, 2024

Have you ever felt tired of clunky websites that take ages to load every new page? We’ve all been there. Enter the world of Single Page Applications (SPAs), sleek interfaces that feel more like native apps than traditional websites. They load once, then dynamically update the content without constant refreshes, giving you a smooth and responsive experience.

Now, building an SPA involves choosing the right tools. Two rising stars in the development world are React and Redux. React lets you build reusable components that make your UI modular and easy to manage. Redux, on the other hand, keeps your app’s data organized and predictable, even as things get complex.

So, why use React and Redux together? It’s a power couple! React shines at building beautiful and dynamic UIs, while Redux ensures that the data behind those UIs stays consistent and manageable. They complement each other perfectly, helping you craft SPAs that are not only delightful to use but also a joy to develop.

This tutorial is for developers who want to get their hands dirty with React and Redux. We’ll assume you’re familiar with JavaScript and basic web development concepts, but don’t worry if you’re not a Redux guru yet. We’ll break everything down step-by-step, from setting up your environment to building a real-world SPA.

Whether you’re building a to-do list app or a full-blown e-commerce platform, mastering React and Redux will equip you with the skills to create modern, engaging SPAs that users will love. So, buckle up, grab your coding coffee, and let’s dive into the exciting world of React and Redux!

Before we start building cool app features, let’s get our development environment prepped and polished.

There are a few ways to do this, but we’ll use the popular create-react-app tool. It’s like a fancy recipe guide that gets you started with all the basic ingredients (files and folders) you need for a React project. Just open your terminal, navigate to where you want your project to live, and type:

$ npx create-react-app my-awesome-spa

This creates a new folder called my-awesome-spa with all the essential files in place. Now, navigate into that folder and start your application with:

$ npm start

Voila! Your SPA is running (at least the basic skeleton) on http://localhost:3000. Open it in your browser and see if it is working.

Installing Redux

Next, we need to invite our data management partner, Redux. Execute the following command to install Redux.

$ npm install redux react-redux

These packages will give you access to all the tools you need to manage your app’s data like a pro.

Before we start coding, let’s take a quick tour of the project structure. You’ll find familiar things like your src folder where all your code goes, and a public folder for static assets like images. But you’ll also see some new friends:

  • redux folder: This is where you’ll keep all your Redux-related files, like reducers and actions.
  • components folder: This is where your building blocks – your React components – will live.

Remember, this is just a basic layout. Feel free to adapt and organize it to fit your workflow as you progress.

Now, with the environment ready, let’s dive into the world of Redux and start building the brains of our amazing SPA! If you’re curious about what’s inside each folder, don’t hesitate to explore. Open the files and see what the default code looks like. It’s a great way to get familiar with the basic structure.

Understanding Redux Concepts

Think of Redux as the control center for your app’s data, keeping everything organized and predictable even as your SPA grows more complex. Let’s break down the key concepts:

  • The Store: Imagine it as a big treasure chest holding all your app’s data. It’s the single source of truth, accessible by all your components but never edited directly.
  • State: This is the actual treasure inside the chest – the current snapshot of all your app’s information. Things like user logins, shopping cart items, and task lists live here.
  • Actions: Think of these as messengers delivering instructions to the state. They don’t hold data themselves, but they tell the store exactly what to change (like “add an item to the cart” or “mark a task completed”).
  • Reducers: These are the clever chefs in the kitchen. They receive the actions and use them to update the state in a predictable way. No surprises allowed!
  • Dispatchers: They’re like the waiters, taking your action orders and sending them off to the reducers for processing. You can’t directly access the store, but you can always hand your actions to the dispatcher to get things done.

Putting it all together: Imagine you want to add a new item to your shopping cart. You click a button, which triggers an “add item” action. The dispatcher whisks it away to the reducers, who consult the current state (your cart), find the right spot, and add the new item in a controlled way. Finally, the updated state is served back to all your components, so your UI reflects the change instantly.

This might seem like a lot to juggle, but trust us, it becomes second nature with practice. You’ll soon appreciate how Redux keeps your data organized and predictable.

Building the SPA : Example

Now that we understand the backstage magic of Redux, let’s bring it to life in our SPA! Remember, we’re building an awesome app, so let’s create a simple to-do list to showcase the power of this dynamic duo.

1. Building the Components:

First, we’ll create React components for our to-do list:

  • TodoList: This will be the main container, displaying the list of tasks and buttons to add and remove them.
  • TodoItem: Each individual task will be a reusable component with its own text and completion checkbox.

2. Connecting Components to Redux:

This is where Redux shines! We’ll use the react-redux library to connect our components to the store:

  • Provider: This wraps our entire application and makes the Redux store accessible to all components.
  • connect: This function connects a component to the store and provides access to its state and dispatch function.

3. Adding and Removing Tasks:

Let’s see this in action:

  • Adding a new task: When you click the “Add Task” button, it triggers an “addTodo” action.
  • Redux takes action: The dispatcher sends the action to the reducers.
  • State update: The reducers add the new task to the state based on the action’s payload (the new task’s text).
  • Components react: The connected components receive the updated state and automatically render the new task in the list.

4. Marking Tasks Complete:

Similar to adding tasks, clicking the checkbox on a TodoItem triggers a “markComplete” action. The reducers update the state based on the task’s ID, and the component updates its appearance to reflect the completed task. Here is the example code for this action.

// TodoList.js
import React from 'react';
import { connect } from 'react-redux';

const TodoList = ({ todos, dispatch }) => (
    <h1>To-Do List</h1>
      { => (
        <TodoItem key={} todo={todo} dispatch={dispatch} />
    <button onClick={() => dispatch({ type: 'addTodo', text: 'New Task' })}>
      Add Task

export default connect((state) => ({ todos: state.todos }))(TodoList);

// TodoItem.js
const TodoItem = ({ todo, dispatch }) => (
    <input type="checkbox" checked={todo.completed} onChange={() => dispatch({ type: 'markComplete', id: })} />

export default TodoItem;

This is just a basic example, but it shows how React and Redux work together to manage state and update the UI seamlessly. As your SPA grows more complex, this partnership will become even more valuable, keeping your data organized and your app running smoothly.


Congratulations, you’ve taken your first steps into the exciting world of building SPAs with React and Redux! You’ve explored the key concepts, seen how they work together, and even built a simple to-do list to put your newfound knowledge into practice.

Remember, this is just the beginning. The possibilities with React and Redux are endless, from building dynamic dashboards and interactive games to crafting beautiful and user-friendly interfaces for any kind of application. So, keep learning, keep experimenting, and most importantly, keep building! Your next masterpiece SPA awaits.

Don’t hesitate to explore the vast resources available online, join communities of fellow developers, and never stop asking questions. If you have any questions, You can also comment down in the comment section. We are happy to help!

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