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"Node.js es un entorno de ejecución para JavaScript construido con el motor de JavaScript V8 de Chrome. … . El ecosistema de paquetes de Node.js, npm, es el ecosistema mas grande de librerías de código abierto en el mundo."
Documentación oficial con gestionadores de paquetes
https://nodejs.org/en/download/package-manager
https://github.com/creationix/nvm
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm
nvm install v4.2
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Gestionandor de paquetes de nodejs
# crear archivo package.json
npm init
# instalar express
npm install --save express
// index.js
var express = require('express');
var app = express();
app.get('/user/:id', function (req, res) {
console.log(req.params);
console.log(req.query);
var message = 'Hello ' + req.params.id;
res.send(message);
});
app.listen(3000, function () {
console.log('Example app listening on port 3000!');
});$ curl "localhost:3000/user/alice?today=monday&tomorrow=tuesday"
Hello alice$ node index.js
Example app listening on port 3000!
{ id: 'alice' }
{ today: 'monday', tomorrow: 'tuesday' }https://github.com/websockets/ws
npm install --save ws
// index.js
const WebSocket = require('ws');
const wss = new WebSocket.Server({port:8080});
wss.on('connection', function connection (ws) {
console.log('Started connection with browser');
ws.on('message', function (message) {
console.log('From Browser: %s', message);
});
let i = 0;
setInterval(function() {
console.log('Sending to browser ' + ++i);
ws.send('the value es ' + i);
}, 1000);
});<html>
<head>
<script src="client.js" type="text/javascript" charset="utf-8"></script>
</head>
</html>// client.js
var ws = new WebSocket('ws://localhost:8080');
ws.onopen = function (event) {
ws.send('Hello from browser');
};
ws.onmessage = function (event) {
console.log('From Server: %s', event.data);
};$ node index.js
Started connection with browser
From Browser: Hello from browser
Sending to browser 1
Sending to browser 2
From Server: the value es 1
From Server: the value es 2
https://nodejs.org/en/foundation/members/#corporate-members
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