Supercharge Your React State Management like a Senior Dev: Unlocking the Power of Zustand and React Query
Tags: frontend, javascript, react, tutorial
Published: 2023-07-14 14:41:42


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/omdzwry3ywxvkt0me2nf.png)


Managing the state in a React application can be a complex and time-consuming task. As your application grows in size and complexity, it becomes increasingly difficult to manage the state in a scalable and maintainable way. Fortunately, there are a number of lightweight and powerful state management libraries available for React that can help simplify this task. In this article, we'll explore two of these libraries – Zustand and React Query – and show how they can be used together to provide a robust and flexible solution for managing the state in your React application.

## What is Zustand?
Zustand is a lightweight state management library for React that uses functional programming concepts to define and manage states. Unlike Redux, Zustand does not rely on a global store or a complicated set of actions and reducers. Instead, Zustand allows you to define state using simple JavaScript objects and functions. This makes it easy to define and manage the state in a scalable and maintainable way, without the overhead of more complex state management solutions.

Zustand works by creating a custom React hook that provides access to the state and a set of update functions. This hook can be used anywhere in your application to access and update the state. Zustand also provides a set of helper functions and utilities that make it easy to define and manipulate the state in a variety of ways.


## What is React Query?
React Query is a powerful and flexible data fetching and caching library for React. It provides a simple and declarative API for fetching data from a variety of sources, including REST APIs, GraphQL APIs, and more. React Query also provides a powerful caching layer that can be used to manage the server state in your application.

One of the key advantages of React Query is its flexibility. It provides a variety of options for configuring data fetching and caching, including support for automatic retries, background re-fetching, and more. This makes it easy to handle a wide range of data fetching and caching scenarios in your application, without the need for custom logic or boilerplate.

## Using Zustand and React Query Together
Zustand and React Query are both powerful state management libraries in their own right, but they can be even more powerful when used together. By combining the two libraries, you can create a robust and flexible solution for managing the state in your React application.

At a high level, the approach is simple: use Zustand to manage the local state in your application, and use React Query to manage the server state. Zustand provides a simple and flexible way to define and manage local states using functional programming concepts, while React Query provides a powerful and flexible way to manage server states using a declarative API.

Let's take a closer look at how this can be implemented in practice.

## Defining State with Zustand
The first step in using Zustand and React Query together is to define your application's state using Zustand. This involves creating a custom hook that defines the state and provides a set of update functions.

Here's an example of what this might look like:


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/y150eo205j2ktgs1lobl.png)

In this example, we're defining a simple counter that uses Zustand to manage its state. The `useStore` hook returns an object that contains a `count` property, as well as `increment` and `decrement` functions that can be used to update the state.


## Implementing React Query with Zustand
Now that we understand the advantages of using Zustand and React Query together, let's explore how to implement React Query within a Zustand-powered application.

**1. Installing React Query**
First, we need to install React Query and its dependencies. Open your terminal and navigate to your project directory.

Run the following command: `npm install react-query`

**2. Setting Up React Query Provider**
To use React Query, we need to wrap our application with the `QueryClientProvider` component. This component will provide the necessary context for React Query to work correctly. In your root component file, import the necessary dependencies:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qpsnidr06pfbbp9n0b03.png)

Here, we create a new instance of `QueryClient` and wrap our entire application within `QueryClientProvider`, passing the `queryClient` as a prop.

**3. Fetching Data with React Query**
React Query provides a simple and declarative API for fetching data. Let's see an example of fetching data from an API endpoint using React Query.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/3apkuuio0psyr3fv27kb.png)

In this example, we use the `useQuery` hook from React Query to fetch data from the `api/users` endpoint. The first argument to `useQuery` is a unique key that identifies this query. The second argument is an asynchronous function that performs the data fetching. React Query handles the caching, background re-fetching, and error handling for us.

The useQuery hook returns an object with `data`, `isLoading`, and `isError properties. We can utilize these properties to handle different states of the data fetching process

**4. Combining Zustand and React Query**
To combine Zustand and React Query, we can integrate React Query's data into Zustand's state. We can use Zustand to manage the global state and React Query to fetch and update data.

Let's see an example of integrating React Query data into Zustand:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/em963altsbabbmn74jdx.png)

In this example, we define a `users` state in Zustand using the `useStore` hook. We also define a `setUsers` function to update the state. Inside the `UsersList` component, we use the `useQuery` hook to fetch data from the API endpoint. When the data is available, we call the `setUsers` function to update the Zustand state with the fetched data.

By combining Zustand and React Query, we can easily manage the global state using Zustand while leveraging React Query's powerful data fetching and caching capabilities.

## Advantages of Using Zustand and React Query Together
As we discussed earlier, Zustand and React Query are two powerful state management libraries for React applications. When used together, they offer several advantages over other solutions, such as Redux or even using them separately. Let's explore some of these advantages in more detail.

**1. Simplified Code**

One of the most significant advantages of using Zustand and React Query together is that they simplify your code. Zustand provides a simple API for managing your application's state, and React Query simplifies data fetching and caching. When used together, you can eliminate a lot of boilerplate code that you would otherwise need to write.
For example, you can use Zustand to manage your application's global state, and then use React Query to fetch data from your API. This allows you to keep your data and UI separate, making your code more modular and easier to reason about.

**2. Improved Performance**

React Query's caching mechanism provides an excellent performance boost to your application. By caching data on the client-side, you can reduce the number of network requests your application makes, making it faster and more responsive.

Zustand's small size and simplicity also contribute to improved performance. Zustand is much smaller than Redux, making it faster to load and reducing the memory footprint of your application.

**3. Easy Integration**

Both Zustand and React Query are easy to integrate into your existing React applications. Zustand provides a simple API that works well with React's hooks, making it easy to integrate into your components. React Query is also easy to integrate and can be used with any data fetching library, making it flexible and customizable.

**4. Scalability**

Zustand's simplicity makes it a great choice for small to medium-sized applications. However, when combined with React Query, it becomes a powerful tool for building large, complex applications. React Query's caching mechanism and easy integration with other libraries make it a great choice for scaling your application.

**Conclusion**

Zustand and React Query are powerful state management libraries that, when used together, provide a simple and scalable solution for managing state and fetching data in React applications. Zustand simplifies the management of the local state, while React Query handles the server state and provides a performant caching layer.

By integrating React Query with Zustand, you can enjoy the benefits of simplified code, improved performance, easy integration, and scalability in your React applications. Whether you're building a small project or a large-scale application, Zustand and React Query together offer a robust and flexible solution for state management and data fetching.

Incorporate Zustand and React Query into your next React project, and experience the efficiency and productivity they bring to your state management workflow.