Question: Give example of express JS working with Node?
var express = require('express');
var app = express();
var bodyParser = require('body-parser')
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
app.get('/', function(req, res){
res.send('id: ' + req.query.id);
});
app.listen(3000);
Question: What is use of body-parser?
It is middleware in nodeJS.
body-parser is used to parse incoming request bodies, available under the req.body property.
Example-1: URL / with Get Method.
app.get('/', function (req, res) {
res.send('Hello, this is Home page.')
})
Example-2: URL /about with Get Method.
app.get('/about', function (req, res) {
res.send('You have called /about with get method.')
})
Example-3. URL /senddata with POST Method.
app.post('/senddata', function (req, res) {
//req.body have all the parameter
console.log(req.body);
res.send('Hello, Received post data request.')
})
Example-4: Routing with Regex
app.get('/ab?cd', function (req, res) {
res.send('ab?cd')
})
This route path will match acd, abcd.
Example-5: Routing with Regex
app.get('/ab+cd', function (req, res) {
res.send('ab?cd')
})
This route path will match abcd, abbcd, abbbcd, and so on.Example-6: Routing with dynamic parameter
app.get('/users/:userId/books/:bookId', function (req, res) {
console.log(req.params);
res.send('Received the request for /users/10/book/12222');
});
Request URL: http://localhost:8080/users/10/books/12222
Example-7: Routing with dynamic parameter - Example 2
app.get('/messages/:from-:to', function (req, res) {
console.log(req.params);
res.send('Received the request for /messages/10-100');
});
Request URL: http://localhost:8080/messages/10-1000
Question: How to send request with all methods i.e GET/POST/PUT
app.all('/messages/list', function (req, res) {
res.send('Work for all type of request');
});
