router in node js code example
Example 1: 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
Example 2: routes in node js
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
Example 3: express 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;
Example 4: routes in node js
var birds = require('./birds')
// ...
app.use('/birds', birds)
Example 5: express() vs express.router()
var express = require('express');
var router = express.Router();
router.get('/', function(req, res) {
res.send('GET handler for /dogs route.');
});
router.post('/', function(req, res) {
res.send('POST handler for /dogs route.');
});
module.exports = router;