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npm-init | npm Docs

Create a package.json file

npm init [--yes|-y|--scope]
npm init <@scope> (same as `npm exec <@scope>/create`)
npm init [<@scope>/]<name> (same as `npm exec [<@scope>/]create-<name>`)
npm init [-w <dir>] [args...]

npm init <initializer> can be used to set up a new or existing npm package.

initializer in this case is an npm package named create-<initializer>, which will be installed by npm-exec, and then have its main bin executed -- presumably creating or updating package.json and running any other initialization-related operations.

The init command is transformed to a corresponding npm exec operation as follows:

• npm init foo -> npm exec create-foo
• npm init @usr/foo -> npm exec @usr/create-foo
• npm init @usr -> npm exec @usr/create

If the initializer is omitted (by just calling npm init), init will fall back to legacy init behavior. It will ask you a bunch of questions, and then write a package.json for you. It will attempt to make reasonable guesses based on existing fields, dependencies, and options selected. It is strictly additive, so it will keep any fields and values that were already set. You can also use -y/--yes to skip the questionnaire altogether. If you pass --scope, it will create a scoped package.

Any additional options will be passed directly to the command, so npm init foo -- --hello will map to npm exec -- create-foo --hello.

To better illustrate how options are forwarded, here's a more evolved example showing options passed to both the npm cli and a create package, both following commands are equivalent:

• npm init foo -y --registry=<url> -- --hello -a
• npm exec -y --registry=<url> -- create-foo --hello -a

Create a new React-based project using create-react-app:

$ npm init react-app ./my-react-app

Create a new esm-compatible package using create-esm:

$ mkdir my-esm-lib && cd my-esm-lib
$ npm init esm --yes

Generate a plain old package.json using legacy init:

$ mkdir my-npm-pkg && cd my-npm-pkg
$ git init
$ npm init

Generate it without having it ask any questions:

It's possible to create a new workspace within your project by using the workspace config option. When using npm init -w <dir> the cli will create the folders and boilerplate expected while also adding a reference to your project package.json "workspaces": [] property in order to make sure that new generated workspace is properly set up as such.

Given a project with no workspaces, e.g:

You may generate a new workspace using the legacy init:

That will generate a new folder and package.json file, while also updating your top-level package.json to add the reference to this new workspace:

.
+-- package.json
`-- packages
   `-- a
       `-- package.json

The workspaces init also supports the npm init <initializer> -w <dir> syntax, following the same set of rules explained earlier in the initial Description section of this page. Similar to the previous example of creating a new React-based project using create-react-app, the following syntax will make sure to create the new react app as a nested workspace within your project and configure your package.json to recognize it as such:

npm init -w packages/my-react-app react-app .

This will make sure to generate your react app as expected, one important consideration to have in mind is that npm exec is going to be run in the context of the newly created folder for that workspace, and that's the reason why in this example the initializer uses the initializer name followed with a dot to represent the current directory in that context, e.g: react-app .:

.
+-- package.json
`-- packages
   +-- a
   |   `-- package.json
   `-- my-react-app
       +-- README
       +-- package.json
       `-- ...

• Default: null
• Type: null or Boolean

Automatically answer "yes" to any prompts that npm might print on the command line.

• Default: false
• Type: Boolean

Removes various protections against unfortunate side effects, common mistakes, unnecessary performance degradation, and malicious input.

• Allow clobbering non-npm files in global installs.
• Allow the npm version command to work on an unclean git repository.
• Allow deleting the cache folder with npm cache clean.
• Allow installing packages that have an engines declaration requiring a different version of npm.
• Allow installing packages that have an engines declaration requiring a different version of node, even if --engine-strict is enabled.
• Allow npm audit fix to install modules outside your stated dependency range (including SemVer-major changes).
• Allow unpublishing all versions of a published package.
• Allow conflicting peerDependencies to be installed in the root project.
• Implicitly set --yes during npm init.
• Allow clobbering existing values in npm pkg

If you don't have a clear idea of what you want to do, it is strongly recommended that you do not use this option!

• Default:
• Type: String (can be set multiple times)

Enable running a command in the context of the configured workspaces of the current project while filtering by running only the workspaces defined by this configuration option.

Valid values for the workspace config are either:

• Workspace names
• Path to a workspace directory
• Path to a parent workspace directory (will result to selecting all of the nested workspaces)

When set for the npm init command, this may be set to the folder of a workspace which does not yet exist, to create the folder and set it up as a brand new workspace within the project.

This value is not exported to the environment for child processes.

• Default: false
• Type: Boolean

Enable running a command in the context of all the configured workspaces.

This value is not exported to the environment for child processes.

• init-package-json module
• package.json
• npm version
• npm scope
• npm exec
• npm workspaces

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