Introduction to NVM and NPM

npm

What is npm and nvm?

  • npm (Node Package Manager)
    • JavaScript 套件庫管理工具，可以藉由它下載各式各樣的套件
  • nvm (Node Version Manager)
    • 各套件和專案用的 Node.js 版本不同，而版本間有不相容的問題，導致套件和專案無法順利運行，因此需要版本管理工具
    • 從 nvm 下載/更換 Node.js 和 npm 版本

Install nvm (for MacOS)

  • Install nvm using Homebrew
brew install nvm
  • Add nvm command to shell
echo "source $(brew --prefix nvm)/nvm.sh" >> .bash_profile
  • Reload the bashprofile file
. ~/.bash_profile

or

source ~/.bash_profile
  • If using zsh, need to add command to zshrc
    • open ~/.zshrc
    • Add source ~/.bash_profile to file, which means load all commands under bashprofile
  • Check if installation is successful
nvm --version
> Example output: 0.35.1

or

command -v nvm
> output: nvm

Install Node.js and npm by nvm

  • Check available remote version
nvm ls-remote
  • Install preferred version
nvm install <version>
  • Use specific version
nvm use <version>
> Example output: Now using node v10.17.0 (npm v6.11.3)
  • See available local versions
nvm list