express js example
//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:${port}`))
//visit localhost:3000
// assuming you have done 1) npm init 2) npm install expressexpress router file
var express = require('express');
var router = express.Router();
// middleware that is specific to this router
router.use(function timeLog (req, res, next) {
console.log('Time: ', Date.now());
next();
});
// define the home page route
router.get('/', function (req, res) {
res.send('Birds home page');
});
// define the about route
router.get('/about', function (req, res) {
res.send('About birds');
});
module.exports = router;widlicard in express router
//This route path will match acd and abcd.
app.get('/ab?cd', function (req, res) {
res.send('ab?cd')
})
//This route path will match abcd, abbcd, abbbcd, and so on.
app.get('/ab+cd', function (req, res) {
res.send('ab+cd')
})
//This route path will match abcd, abxcd, abRANDOMcd, ab123cd, and so on.
app.get('/ab*cd', function (req, res) {
res.send('ab*cd')
})
//This route path will match /abe and /abcde.
app.get('/ab(cd)?e', function (req, res) {
res.send('ab(cd)?e')
})
//This route path will match anything with an “a” in it.
app.get(/a/, function (req, res) {
res.send('/a/')
})
//This route path will match butterfly and dragonfly,
//but not butterflyman, dragonflyman, and so on.
app.get(/.*fly$/, function (req, res) {
res.send('/.*fly$/')
})nodejs express routing
// You need to install the following packages
npm install --save mysql express
// And if you don't want to restart your server after every little change
npm install -g nodemonCopyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
