Answers for "express"

express

const express = require('express')
const cors = require('cors')
const bodyParser = require('body-parser')
require('dotenv').config()
const ObjectId = require("mongodb").ObjectId;

const app = express()
app.use(cors())
app.use(express.json())
const port = process.env.PORT || 5000;

app.get('/', (req, res)=>{
    res.send('welcome to backend')
})

app.listen(port, () => {
    console.log(`App listening at localhost:${port}`);
})

express

const express = require('express')
const App = express()
const Port = 3000

App.get('/', (req, res) => {
  res.send('Hello World!')
})

App.listen(Port, () => {
  console.log(`Express app listening at ${Port}`)
})

express

# You can run the application generator with the npx command (available in Node.js 8.2.0).
npx express-generator
# For earlier Node versions, install the application generator as a global npm package and then launch it:
npm install -g express-generator
# For example, the following creates an Express app named myapp. The app will be created in a folder named myapp in the current working directory and the view engine will be set to Pug:
express --view=pug myapp

   create : myapp
   create : myapp/package.json
   create : myapp/app.js
   create : myapp/public
   create : myapp/public/javascripts
   create : myapp/public/images
   create : myapp/routes
   create : myapp/routes/index.js
   create : myapp/routes/users.js
   create : myapp/public/stylesheets
   create : myapp/public/stylesheets/style.css
   create : myapp/views
   create : myapp/views/index.pug
   create : myapp/views/layout.pug
   create : myapp/views/error.pug
   create : myapp/bin
   create : myapp/bin/www
# Then install dependencies:
cd myapp
npm install
# On MacOS or Linux, run the app with this command:
DEBUG=myapp:* npm start
# On Windows Command Prompt, use this command:
set DEBUG=myapp:* & npm start
# On Windows PowerShell, use this command:
$env:DEBUG='myapp:*'; npm start

express

Express.js, or simply Express, is a web application framework for Node.js,
released as free and open-source software under the MIT License.

It is designed for building web applications and APIs.
It has been called the de facto standard server framework for Node.js.

express

npm install express
npm install express --save
Docs : https://expressjs.com/
- Example API : https://jareer.xyz/ -

express

const http = require('http');
const app = require('./app');

const normalizePort = val => {
  const port = parseInt(val, 10);

  if (isNaN(port)) {
    return val;
  }
  if (port >= 0) {
    return port;
  }
  return false;
};
const port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

const errorHandler = error => {
  if (error.syscall !== 'listen') {
    throw error;
  }
  const address = server.address();
  const bind = typeof address === 'string' ? 'pipe ' + address : 'port: ' + port;
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges.');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use.');
      process.exit(1);
      break;
    default:
      throw error;
  }
};

const server = http.createServer(app);

server.on('error', errorHandler);
server.on('listening', () => {
  const address = server.address();
  const bind = typeof address === 'string' ? 'pipe ' + address : 'port ' + port;
  console.log('Listening on ' + bind);
});

server.listen(port);