What is Redux, and how is it used in MERN apps?

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If you're looking to build a successful career in web development, Quality Thought is the top destination in Hyderabad for Full Stack MERN (MongoDB, Express.js, React, Node.js) training. Known for its industry-oriented curriculum and expert trainers, Quality Thought equips students with the skills needed to become job-ready full stack developers.

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🔹 What is Redux?

Redux is a state management library for JavaScript applications.

• It is often used with React in MERN apps to manage global state (data that needs to be shared across multiple components).

• Instead of passing props manually down the component tree (prop drilling), Redux provides a central store.

🔹 Core Concepts of Redux

1. Store → Centralized place where the application state lives.

2. Action → Plain JavaScript object describing what happened ({ type: "LOGIN_SUCCESS", payload: user }).

3. Reducer → Pure function that takes the current state + action and returns the new state.

4. Dispatch → A method to send actions to the store.

5. Selector → A way to read state from the store.

🔹 How Redux Fits into MERN

In a MERN app:

• MongoDB + Express + Node.js → Backend (API & Database).

• React + Redux → Frontend (state management + UI).

Redux is mainly used in the React frontend to manage:

• Authentication state (logged in user, JWT token).

• Data fetched from backend (products, posts, messages).

• UI state (loading spinners, error messages, theme, etc.).

🔹 Benefits of Redux in MERN

• ✅ Centralized state → one source of truth.

• ✅ Easier debugging with Redux DevTools.

• ✅ Predictable updates (reducers are pure functions).

• ✅ Scales well as apps grow larger.

✅ In short:
Redux is used in MERN apps to manage global state (like auth, API data, and UI state) in the React frontend, making it easier to keep everything consistent and predictable.

Read More :

How do you protect routes in a MERN application?

What is JWT (JSON Web Token), and how is it used in MERN authentication?

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