npm-init

Create a package.json file

Table of contents

Synopsis

npm init <package-spec> (same as `npx <package-spec>`)
npm init <@scope> (same as `npx <@scope>/create`)

aliases: create, innit

Description

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:

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.

Note: if a user already has the create-<initializer> package globally installed, that will be what npm init uses. If you want npm to use the latest version, or another specific version you must specify it:

Forwarding additional options

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:

Examples

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:

$ npm init -y

Workspaces support

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:

.
+-- package.json

You may generate a new workspace using the legacy init:

$ npm init -w packages/a

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
       `-- ...

Configuration

init-author-name

The value npm init should use by default for the package author's name.

init-author-url

The value npm init should use by default for the package author's homepage.

init-license

The value npm init should use by default for the package license.

init-module

A module that will be loaded by the npm init command. See the documentation for the init-package-json module for more information, or npm init.

init-version

The value that npm init should use by default for the package version number, if not already set in package.json.

yes

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

force

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

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!

scope

Associate an operation with a scope for a scoped registry.

Useful when logging in to or out of a private registry:

# log in, linking the scope to the custom registry
npm login --scope=@mycorp --registry=https://registry.mycorp.com

# log out, removing the link and the auth token
npm logout --scope=@mycorp

This will cause @mycorp to be mapped to the registry for future installation of packages specified according to the pattern @mycorp/package.

This will also cause npm init to create a scoped package.

# accept all defaults, and create a package named "@foo/whatever",
# instead of just named "whatever"
npm init --scope=@foo --yes

workspace

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:

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.

workspaces

Set to true to run the command in the context of all configured workspaces.

Explicitly setting this to false will cause commands like install to ignore workspaces altogether. When not set explicitly:

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

workspaces-update

If set to true, the npm cli will run an update after operations that may possibly change the workspaces installed to the node_modules folder.

include-workspace-root

Include the workspace root when workspaces are enabled for a command.

When false, specifying individual workspaces via the workspace config, or all workspaces via the workspaces flag, will cause npm to operate only on the specified workspaces, and not on the root project.

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

See Also