Node.js Notes

Installation Commands

$ brew update // get latest version of brew
$ brew install node
$ node -v // check if it is done

NPM Commands

$ npm -v
$ npm init // to generate package.json file
$ npm install ${package} --save // Using 'save' option to add dependency into package.json
$ npm install yargs@4.7.1 --save // @ is for version specified.
$ npm install // follow package.json to install all dependencies
$ npm i express@4.14.0 --save
$ npm i socket.io@1.4.8 --save
$ npm i expect@1.20.2 mocha@3.0.2 --save-dev
$ npm i nodemon@1.10.2 --save-dev // install at local and use it instead of global one
$ npm uninstall ${package}

Utility & Framework

• axios (Promise based HTTP client)

• expect (For assertion)

• express (Web framework)

• mocha (Test framework)

• lodash (useful functions)

• request (HTTP client)

• socket.io (Real time application)

• yargs (CLI module)

Tools

• Nodemon (command line utility for hot deployment)

  $ npm install nodemon -g // global, can execute command from command line.

Debugging

• Executing in debug mode

  $ node inspect ${file}

• Actions under debug mode:

  • list(${number}) // lines to display

  • n // next

  • c // continue

  • repl // switch to replacement mode

• syntax to halt debugging:

  debugger;