Managing state in React has never been this simple and lightweight! Meet Zustand, a small but powerful state management library that will make your life as a developer much easier. Whether you're tired of Redux's boilerplate or Context API's limitations, Zustand is here to save the day.

In this post, I'll introduce Zustand and share a starter project I've built, available on GitHub. Follow along to get started with Zustand in a Next.js project in just a few steps! ?

What is Zustand? ?

Zustand (German for "state") is a minimalistic state management library for React. It offers:

• A super-simple API.
• High performance with no unnecessary re-renders.
• Easy-to-understand syntax.
• Built-in middleware support (e.g., for persisting state).

Now, let’s dive into setting it up in your Next.js project!

How to Set Up Zustand in Your Next.js Project

Follow these easy steps to integrate Zustand into your Next.js app.

1. Install Zustand

Run the following command to install Zustand:

npm i zustand

2. Create a Store Folder

Inside your src folder, create a new folder named store. This will hold all your Zustand state files.

src/
  store/
    index.ts
    userStore.ts

3. Add Your Stores

userStore.ts

This store will handle user-related data.

import { create } from "zustand";

interface User {
  id: string;
  name: string;
  email: string;
}

interface UserStore {
  user: User | null;
  setUser: (user: User | null) => void;
}

export const useUserStore = create<UserStore>((set) => ({
  user: null,
  setUser: (user: User | null) => set({ user }),
}));

counterStore.ts (with persist)

This store will handle a counter state and persist it in localStorage.

"use client";

import { create } from "zustand";
import { persist, createJSONStorage } from "zustand/middleware";

interface ICounterStore {
  counter: number;
  increment : ()=> void;
  decrement : ()=> void;
  reset : ()=> void;
  getLatestCountDivided2: ()=> number;
}
export const useCounterStore = create<ICounterStore>()(
  persist(
    (set, get) => ({
      counter: 0,

      increment: () => set(state => ({ counter: state.counter + 1 })),
      decrement: () => set(state => ({ counter: state.counter - 1 })),
      reset: () => set({ counter: 0 }),
      getLatestCountDivided2: ()=> get().counter / 2,
    }),
    {
      name: "counter-store",
      storage: createJSONStorage(()=> localStorage),
    }
  )
);

index.ts

This file will export all the stores for easier imports.

import { useUserStore } from "./userStore";
import { useCounterStore } from "./counterStore";

export { useUserStore, useCounterStore };

4. Using Zustand in Components

Here’s an example of how to use Zustand stores in your Next.js components.

Home.tsx

"use client";
import { useCounterStore, useUserStore } from "@/store";
import Link from "next/link";

export default function Home() {
  // Access Zustand stores
  const userStore = useUserStore();
  const counterStore = useCounterStore();

  const handleAddUser = () => {
    userStore.setUser({ id: "1", name: "Joodi", email: "mail@example.com" });
  };

  return (
    <div className="">
      <div className="flex gap-2 p-2">
        <Link className="p-2 border" href="/">Home</Link>
        <Link className="p-2 border" href="/about">About</Link>
        <Link className="p-2 border" href="/contact">Contact</Link>
      </div>
      <h1>Hello</h1>
      <h1>User: {userStore.user?.email}</h1>
      <button
        className="bg-blue-500 rounded-md p-2 text-white"
        onClick={handleAddUser}
      >
        Add User
      </button>

      <br />
      <h1>Counter: {counterStore.counter}</h1>
      <button className="bg-blue-500 rounded-md text-white p-2" onClick={counterStore.increment}>
        Increment
      </button>
      <button className="bg-blue-500 rounded-md text-white p-2" onClick={counterStore.decrement}>
        Decrement
      </button>
      <button className="bg-blue-500 rounded-md text-white p-2" onClick={counterStore.reset}>
        Reset
      </button>
    </div>
  );
}

Starter Project Repository ?

The full code for this starter project is available on GitHub. It’s beginner-friendly and includes everything you need to start using Zustand with Next.js.

Clone the repository and get started:

git clone https://github.com/MiladJoodi/Zustand_Starter_Project.git
cd Zustand_Starter_Project
npm install
npm run dev

Start managing your state effortlessly with Zustand. Let me know what you think, or share your own use cases! ?

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