creating a node server code example
Example 1: how to create node js server
/* ====== create node.js server with core 'http' module ====== */
// dependencies
const http = require("http");
// PORT
const PORT = 3000;
// server create
const server = http.createServer((req, res) => {
if (req.url === "/") {
res.write("This is home page.");
res.end();
} else if (req.url === "/about" && req.method === "GET") {
res.write("This is about page.");
res.end();
} else {
res.write("Not Found!");
res.end();
}
});
// server listen port
server.listen(PORT);
console.log(`Server is running on PORT: ${PORT}`);
/* ========== *** ========== */
/* ====== create node.js server with express.js framework ====== */
// dependencies
const express = require("express");
const app = express();
app.get("/", (req, res) => {
res.send("This is home page.");
});
app.post("/", (req, res) => {
res.send("This is home page with post request.");
});
// PORT
const PORT = 3000;
app.listen(PORT, () => {
console.log(`Server is running on PORT: ${PORT}`);
});
// ======== Instructions ========
// save this as index.js
// you have to download and install node.js on your machine
// open terminal or command prompt
// type node index.js
// find your server at http://localhost:3000
Example 2: create server with node js
const express = require('express');
const server = express();
const PORT = 3000;
// Homme page
server.get('/', (req, res) => {
return res.send("<h1 style='text-align: center;'>Hello,<br />from the Express.js server!</h1>");
})
// About page
server.get('/about', (req, res) => {
return res.send('<h2 style="text-align:center">About us</h2>');
})
// 404 page
server.use((req, res, next) =>{
res.status(404);
// respond with html page
if (req.accepts('html')) {
res.sendFile(__dirname + '/error404.html');
return;
}
// respond with json
else if (req.accepts('json')){
res.send({
status: 404,
error: 'Not found'
});
return;
}
// respond with text
else {
res.type('txt').send('Error 404 - Not found');
}
});
server.listen(PORT, () => {
console.log(`Server is running on port ${PORT}`);
});
Example 3: how to use http in development mode for nodejs
var fs = require("fs"),
http = require("https");
var privateKey = fs.readFileSync('sslcert/server.key').toString();
var certificate = fs.readFileSync('sslcert/server.crt').toString();
var credentials = {key: privateKey, cert: certificate};
var server = http.createServer(credentials,function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
});
server.listen(8000);