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Home command line javascript nodejs npm Basic usage of npm command line

Basic usage of npm command line

Home command line javascript nodejs npm Basic usage of npm command line

Saturday 17 June 2017

AUTHOR Anjaneyulu Batta

I'm assuming that you have already installed the nodejs and npm. If not install nodejs and npm it.

Create a package with npm

```
npm init
```

When we run above command It will ask us a couple of questions about the package that we are going to create. After executing the command it will create a "package.json" file.
We use "init" command only if we want to create a new package.

Installing global packages with npm

```
npm install -g <package name>
```

we install a package globally only if we want to use it as a command line

For example I you want to create a react native app we install react-native-cli globally. It provides "react-native" command we use it to create a react native package.
If you are using ubuntu use the command "sudo npm install -g <package name>" Because it requires superuser permissions.

Installing local packages with npm

```
npm install <package name>
```

We use this command very frequently.
It will install the specified package locally.
After running the above command you can see package inside "node_modules" directory.
If you want to install the package as a dependent package then try the below command. It will save the package name in "package.json" file under dependencies.
```
npm install <package name> --save
```
If you want to install it as development dependent package then try the below command. It will save the package name in "package.json" file under devDependencies.
```
npm install <package name> --save-dev
```
we don't require the development dependent packages in production.

Uninstall a local package

```
npm remove <package name> --save 
```

Uninstall a global package

```
npm remove -g <package name> 
```

Search for a package

```
npm search <package terms>
```

List all globally installed packages

```
npm -g list
```

List all locally installed packages

```
npm list
```

Setup for already existed package

```
npm install
```
when you run above command it will install all packages(development packages and production) from "package.json" file.

command line javascript nodejs npm