最終更新:2023-10-06 (金) 15:25:58 (65d)

npm
npm install
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Install a package

npm install
npm install <package>

パラメータなし

package.jsonに記載されたパッケージが一括でインストールされる

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パラメータ

The -g or --global argument will cause npm to install the package globally rather than locally. See npm help 5 npm-folders.

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エイリアス

add, i, in, ins, inst, insta, instal, isnt, isnta, isntal, isntall

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フォルダ

https://docs.npmjs.com/files/folders

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ローカル

npm bin
Local install (default): puts stuff in ./node_modules of the current package root.

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グローバル

Global install (with -g): puts stuff in /usr/local or wherever node is installed.

npm bin -g

C:\Users\<ユーザ名>\AppData\Roaming\npm

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package.jsonへの追記

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npm install

npm install saves any specified packages into dependencies by default. Additionally, you can control where and how they get saved with some additional flags:

-P, --save-prod	Package will appear in your dependencies. This is the default unless -D or -O are present.
-D, --save-dev	Package will appear in your devDependencies.
-O, --save-optional	Package will appear in your optionalDependencies.
--no-save	Prevents saving to dependencies.

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昔

パッケージリストに保存
- むかしはnpm install --saveとしていた
```
npm install <パッケージ名> --save
```
By default with version npm 5.0+ npm install adds the module to the dependencies list in the package.json

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