Knowledge

node vs npm vs npx

ye 3no node, react, typescript nextjs aur jahannum tk sth rahege

purpose of node js

node index.js main environmnt tht helps running js on servers/outside browsers

npm - not only a package manager

npm run start

npm run dev

npm run x

npx

npx calculator

npx create-react-app (it is a shortcut of npm i create-react-app )

npx create-next-app npx cowsay wow https://github.com/saadfrhan/node-inquirer-calculator-cli intcalc

helps in avoiding versioning issues

npm init vs npm init -y

npm i vs npm install (which files are changed? package.json, package-lock.json, node_modules) which of these three files can we edit? can we delete them? how can we get node_modules back if we delete it

locating packages on npm registry

npm install -g vs npm install --global (will ad in package.json? any example? typescript)

npm install -D vs npm install --save-dev (will add in package.json, where?) any example? @types, linters , tests etc, not for production

npm uninstall (manually from package.json)

Steps to follow

First create an index.js file in a new folder

Add simple console.log('hello world') in it

Run the file using node index.js

You should see hello world on console

Now, run the file using ./index.js

./ is used to run executable files, like you run .exe files on windows

But, you may get permission denied error. Because every file and folder have one of three permissions. Either Read, Write, Execute

run ls -la

So, by default .js files are not executable files

add permissions using chmod +x index.js create pcke json, add bin nd commng add shebang

npm link

npm login

npm publish

unlink

update versions understanding major, minor, patch