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npm commands

npx - npm package runner

https://www.freecodecamp.org/news/npm-vs-npx-whats-the-difference

To install all dependencies​

npm install
npm init # for creating package.json
npm init -y
npm i express
npm i --save-dev nodemon
npm i --save-prod nodemon
npm i jsonwebtoken dotenv

# troubleshooting if error
--legacy-peer-deps: ignore all peerDependencies when installing, in the style of npm version 4 through version 6.

--strict-peer-deps: fail and abort the install process for any conflicting peerDependencies when encountered. By default, npm will only crash for peerDependencies conflicts caused by the direct dependencies of the root project.

--force: will force npm to fetch remote resources even if a local copy exists on disk.

which is safer, the answer is --force
--legacy-peer-deps ignores peer dependencies entirely, which can screw up your dependency resolution.
--force on the other hand simply sets a different peer dependency version for conflicting dependencies

Using force isn't always ideal though because each dependency version takes up extra space. Using force with many dependencies will increase your total space requirement a decent amount.

Run server​

node .

# Compile all ES6 and babel packages and run server
npm start (from the project root directory)

# To install and save to package json file from npm
npm install --save youtube-api-search

Others​

Updating packages​

npm outdated
npm update # to update all the packages
npm update "react" "react-dom" # to update specific packages

npm i -g npm-check-updates
ncu -u
npm install
ncu --interactive --format group

Packages​

  • youtube-api-search - It takes a youtube data api key and a search query and gets all the data from youtube.
  • express
  • body-parser
  • npm install -g nodemon - Nodemon is a utility that will monitor for any changes in your source and automatically restart your server. Perfect for development.
  • jsonwebtoken
  • cors
  • express-jwt
  • https://www.npmjs.com/package/redis
  • npm install gray-matter
  • browser-image-compression - npm

nvm (Node Version Manager)​

nvm allows you to quickly install and use different versions of node via the command line.

Installation​

Install using zsh instead of homebrew on macos

https://github.com/nvm-sh/nvm#troubleshooting-on-macos

https://github.com/nvm-sh/nvm

Commands​

nvm install 14
nvm install 18
nvm install 19

nvm use 14
nvm use 18
nvm use 19

nvm list
nvm cache clear
nvm uninstall 18

Others​

Yarn package manager​

Fast, reliable, and secure dependency management

  • Offline Mode.If you've installed a package before, thenyou can install it again withoutaninternet connection.
  • Deterministic.The same dependencies will be installed in the same exact way on any machine, regardless ofinstallationorder.
  • Network Performance.Yarn efficiently queuesrequests andavoids request waterfalls in order to maximize network utilization.
  • Network Resilience.A single request that fails will not cause the entire installation to fail. Requests are automatically retried upon failure.
  • Flat Mode.Yarn resolves mismatched versions of dependencies to a single version to avoid creating duplicates.

Commands​

yarn # install all dependencies
yarn start # start local server
yarn build # build a production ready deployment

yarn outdated

pnpm​

Fast, disk space efficient package manager

https://pnpm.io

https://github.com/pnpm/pnpm

pnpx (npx for pnpm)​

https://pnpm.io/pnpx-cli

index.js​

// npm install express

const express = require("express");
const app = express();
const PORT = 8888;
app.get('/time', (req, res) => {
    const time = (new Date()).toLocaleTimeString();
    res.status(200).send(`The Time is ${time}`);
});

// catchall route
app.get("*", (req, res) => {
    res.sendStatus(404);
});

app.listen(PORT, () => {
    console.log(`Server is running on port ${PORT}.`);
});

// node .

// npm install body-parser

https://blog.bitsrc.io/understanding-json-web-token-authentication-a1febf0e15