Lecture on CRUD Application Using React and Node.js

Key Operations in CRUD Application

• CRUD Operations: Create, Read, Update, Delete
  • These are fundamental for any application involving data management.

Overview

• API Creation: We'll create APIs for each CRUD operation.
• UI Creation: Develop the user interface to interact with the APIs.
• Connection: Connect back-end and front-end effectively.

Operations Explained

Read Operation

• **Data Fetching: ** Fetch data from MongoDB to display in the application.
  • Example: Displaying user data on a webpage.
  • Performed using HTTP GET requests to the server.

Create Operation

• Data Insertion: Allow users to add new entries to the database.
  • Example: Adding a new user with details like name, email, and password.
  • Handled via a form submission with a POST request.

Update Operation

• Data Update: Modify existing entries in the database.
  • Example: Updating user details like changing the last name or email.
  • Achieved using HTTP PUT requests triggered by form submission.

Delete Operation

• Data Deletion: Remove entries from the database.
  • Example: Deleting a user from the database.
  • Handled via HTTP DELETE requests sent to the server.

Project Setup and Execution

Creating Base Folder Structure

• Folder Creation: Setting up folders for the project (CRUD-App for React project).
• Open in Code Editor: Use Visual Studio Code (VS Code) for development.
• Terminal Setup: Open a terminal for running commands.

Setting Up Client and Server

• **Client (React) Setup: ** npx create-react-app client
• **Server (Node/Express) Setup: ** mkdir server && cd server && npm init
• **Package Installation: ** For the server, install necessary packages using npm:
  • express, mongoose, body-parser, dotenv, etc.

Detailed Steps

Setting Up the Server

• Dependencies: Install express, mongoose, body-parser, dotenv, and cors.
• Project Initialization: npm init to generate package.json.
• Directory Structure: Create directories for controllers, models, and routes.
• **server.js Configuration: ** Configure Express to handle routes, connect to the database, and parse request body.
• **Model Definition: ** Define a Mongoose model for user data with schema fields for first name, last name, email, and password.
• **Routing and Controllers: ** Create route handlers and controllers to manage CRUD operations.

Setting Up React Client

• Initial Setup: Create React app structure and install necessary packages (axios, react-router-dom, react-toastify).
• Folder Structure: Create components for different actions (Add, Update, Fetch Users).
• Component Creation: Develop components with forms and tables to display and manage user data.
• Styling: Use CSS for component styling and UI enhancement.
• API Integration: Use Axios to make HTTP requests to the backend API for CRUD operations.

Integration and Testing

User Interface

• Add User Component: Form to input new user data and send it to the server to create a new user.
  • Fields: First Name, Last Name, Email, Password
  • Submit Button: To send POST request to the server.

Fetching and Displaying Users

• Fetch Users Component: Table to display all user data fetched from the server.
  • Actions: Edit, Delete buttons for each user.

Editing User Data

• Update User Component: Pre-filled form with user data to be updated.
  • Update fields: Modify data and send PUT request to update user.

Deleting User Data

• Delete Operation: Trigger a DELETE request from the client to remove the user from the backend.

Conclusion

• **Project Demo: ** Final CRUD application demonstrating create, read, update, and delete operations working seamlessly with React on the front-end and Node.js on the backend.
• Code Availability: Complete project code available in the provided link for further exploration and learning.

Q&A

• Queries: Open the floor for questions and further clarifications on the CRUD operations or project setup.

Resources

• GitHub Repository: Link to the full source code for the CRUD application.