Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine.

Updating and Switch versions

webi node@stable

Use @lts for long-term support and the @beta tag for pre-releases, or @x.y.z for a specific version.

Cheat Sheet

Node is great for simple, snappy HTTP(S) servers, and for stitching APIs together with minimal fuss or muss.

Installing node via webi will:

  • pick a compatible version from the Node Releases API
  • download and unpack to $HOME/.local/opt/node/
  • update your PATH in $HOME/.config/envman/PATH.env
  • run npm config set scripts-prepend-node-path=true
    • (prevents conflicts with other installed node versions)
  • absolutely leave system file permissions alone
    • (no dreaded sudo npm permission errors)

Hello World

node -e 'console.log("Hello, World!")'
> Hello, World!

A Simple Web Server

server.js:

var http = require('http');
var app = function (req, res) {
  res.end('Hello, World!');
};
http.createServer(app).listen(8080, function () {
  console.info('Listening on', this.address());
});
node server.js

Generate a Secure Random Key

This generates a hex-encoded 128-bit random key.

node -p 'crypto.randomBytes(16).toString("hex")'

This generates a url-safe base64 256-bit random key.

node -p 'crypto.randomBytes(32).toString("base64")
            .replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "")'

An Express App

mkdir my-server
pushd my-server/
npm init
npm install --save express

app.js:

'use strict';

var express = require('express');
var app = express();

app.use('/', function (req, res, next) {
  res.end('Hello, World!');
});

module.exports = app;

server.js:

'use strict';

var http = require('http');
var app = require('./app.js');

http.createServer(app).listen(8080, function () {
  console.info('Listening on', this.address());
});
npm start

Contribute

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