Create controller folder in backend and usercontroler.js file create
import User from '../models/usersModel.js'
import asyncHandler from 'express-async-handler'
//getUsers function to get all users
export const getUsers = asyncHandler(async(req, res) => {
const users = await User.find({})
res.json(users)
})
//getUserById function to retrieve user by id
export const getUserById = asyncHandler(async(req, res) => {
const user = await User.findById(req.params.id)
//if user id match param id send user else throw error
if(user){
res.json(user)
}else{
res.status(404).json({message: "User not found"})
res.status(404)
throw new Error('User not found')
}
})
Create route folder and into create routeuser.js
import { getUsers, getUserById } from "../controllers/userController.js";
import express from 'express'
const router = express.Router()
// express router method to create route for getting all users
router.route('/').get(getUsers)
// express router method to create route for getting users by id
router.route('/:id').get(getUserById)
export default router
Install
npm i dotenv --save
Import
import dotenv from 'dotenv'dotenv.config()
Create .env file in root folder
NODE_ENV = development
PORT = 5000
Create server.js in root folder
import connectDB from './backend/config/db.js'
import userRoutes from './backend/routes/userRoute.js'
import express from 'express'
import dotenv from 'dotenv'
//connect database
connectDB()
//dotenv config
dotenv.config()
const app = express()
//Creating API for user
app.use('/api/users', userRoutes)
const PORT = process.env.PORT || 5000
//Express js listen method to run project on http://localhost:5000
app.listen(PORT, console.log(`App is running in ${process.env.NODE_ENV} mode on port ${PORT}`))
Install
npm i nodemon --save-dev
Now add this line under the scripts object inside the package.json file.
"start": "nodemon backend/server.js"
17. Create a react project with the name frontend.
npx create-react-app frontend
18. Install Axios into your react application.
npm install axios --save
19. Now replace all the code from the app.js file with the below-mentioned code.
Before starting our react application add the below line inside the package.json file of the react project or else you will receive a CORS error in your project.
"proxy": "http://127.0.0.1:5000",
20. Now start the application npm start and refresh the browser to see changes.
So now we have successfully built our first MERN project.
React is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies. React can be used to create single-page applications, mobile applications, and complex user interfaces.
Topics
Topics related to React include:
- Components
- Props
- State
- Hooks
- Virtual DOM
- JSX
- Performance Optimization
- Styling Components
- Testing React Apps
- Accessibility in React Apps
- Server Side Rendering with React.js
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