NodeJS install

Easy one

What is Node.js?

• an open source server environment
• free and runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)
• uses JavaScript on the server

What to do with Node.js?

• generate dynamic page content
• create, open, read, write, delete, and close files on the server
• collect form data
• add, delete, modify data in your database (SQL, MongoDB)
• GPIO, General Purpose Input Output, at Raspberry Pi

Install (or upgrade) the NVM — Node Version Manager

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/<version>/install.sh | bash

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.4/install.sh | bash
or
wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.4/install.sh | bash
export NVM_DIR="$HOME/.nvm"
source ~/.bashrc
nvm ls
nvm --version

NVM will be installed at ~/.nvm, if you need to upgrade it later, run it:

cd ~/.nvm/
git fetch --tags origin
git checkout `git describe --abbrev=0 --tags --match "v[0-9]*" $(git rev-list --tags --max-count=1)` && \. "$NVM_DIR/nvm.sh"
nvm ls-remote
nvm --version

Install latest (also upgrade) Node.js with NVM

nvm ls-remote
nvm install node
nvm use node
node --version

And upgrade the NPM — Node Package Manager

nvm install-latest-npm

Check packages installed

npm list
OR
npm list --depth=0
OR
npm list -g
OR
npm list -g --depth=0

Check Outdated Packages

npm outdated
OR
npm outdated --depth=0
OR
npm outdated -g
OR
npm outdated -g --depth=0

Update Packages

npm update -g
OR
npm update -g <package_name>

<aliases: up, upgrade, udpate>

Create a file hello.js

cat >> hello.js
var http = require('http');

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/html'});
  res.end('Hello World!');
}).listen(8080); 

Start a node server:

node hello.js

Access your local host:

http://localhost:8080/

Hello World!

More Node.js documentation at https://www.w3schools.com/nodejs/default.asp

More NPM documentation at https://docs.npmjs.com/about-npm

Node.js logo