Answers for "hello world from Express"

express hello world

//to run : node filename.js
const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => res.send('Hello World!'))

app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))

//visit localhost:3000
// assuming you have done 1) npm init 2) npm install express

express hello world example

const express = require('express');
const bodyParser = require('body-parser');
const mongoose = require('mongoose');
const cors = require('cors')
const bcrypt = require('bcrypt')
const jwt = require('jsonwebtoken')

//connecting to my cluster database online
mongoose.connect('mongodb+srv://username:[email protected]/databasename?retryWrites=true&w=majority', {useUnifiedTopology: true, useNewUrlParser: true, useCreateIndex: true });

//initializing the app 
const app = express()

//required middlware
app.use(cors())
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: false }))

//Setting default port for the backend server
const PORT = process.env.PORT || 3333
// run in the terminal : export PORT=3333 {{justincase}}


//Test server page running
app.get('/', (req, res) => {
    res.send(`Hello World ,,,, backend is running on port ${PORT}`)
})

// Console log for terminal for server listening
app.listen(PORT, (err) => {
    if(err) return console.log(err);
    console.log(`Server listening on port ${PORT}`)
})