How to build a simple CRUD app with MERN stack

How to Build a Simple CRUD App with MERN Stack

The MERN stack—MongoDB, Express.js, React, and Node.js—is one of the most popular technologies for building full-stack applications. Its power lies in enabling developers to use JavaScript across the entire development cycle, making development faster and more efficient.

In this guide, we’ll walk through how to build a simple CRUD (Create, Read, Update, Delete) app with the MERN stack. CRUD operations are the foundation of most web applications, and learning them will help you master full-stack development.

What is the MERN Stack?

Express.js is a minimal and flexible Node.js framework that provides tools to create robust backend applications and APIs. Developers love Express.js because of its:

1. 1. MongoDB – A NoSQL database to store data in JSON-like documents.
2. 2. Express.js – A Node.js framework for building APIs and handling requests.
3. 3. React.js – A front-end library for building interactive user interfaces.
4. 4. Node.js – A JavaScript runtime for executing server-side code.

Steps to Build a CRUD App with MERN

1. Set Up the Backend (Node.js + Express.js)

Initialize your project:

1. mkdir mern-crud-app
2. cd mern-crud-app
3. npm init -y
4. npm install express mongoose cors nodemon

Create server.js file:

2. Set Up the Frontend (React.js)

Inside your project folder:

1. npx create-react-app client
2. cd client
3. npm install axios

Testing the App

1. Start backend:

1. node server.js

2. Now install Express.js using npm:

1. npm start

Now you have a fully working CRUD app using MERN!

Best Practices for MERN Development

1. Keep backend and frontend code modular.
2. Use environment variables for database URLs.
3. Validate user input to prevent errors.
4. Use async/await for cleaner API handling.
5. Add error handling for API responses.

Building a CRUD app with the MERN stack is the perfect starting point for full-stack developers. It covers frontend UI, backend APIs, and database operations, giving you real-world experience.

Whether you’re a beginner or intermediate developer, practicing CRUD applications with MERN will boost your confidence and prepare you for advanced projects like e-commerce, chat apps, and real-time dashboards.

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