NPM-INSTALL(1)

NAME
npm-install - Install a package

  Synopsis

    npm install [<package-spec> ...]
    aliases: add, i, in, ins, inst, insta, instal, isnt, isnta, isntal, isntall

  Description

This command installs a package and any packages that it depends on. If the package has a package-lock or a yarn lock file, the installation of dependencies will be driven by that, respecting the following order of precedence:

    •   package-lock.json

    •   yarn.lock

See package-lock.json ⟨/configuring-npm/package-lock-json⟩.

  How npm install uses package-lock.json

When you run npm install without arguments, npm compares package.json and package-lock.json:

    •   If the lockfile's resolved versions satisfy the package.json ranges: npm uses the exact versions from package-lock.json to ensure reproducible builds across environments.

    •   If the ranges don't match: npm resolves new versions that satisfy the package.json ranges and updates package-lock.json accordingly. This happens when you modify version ranges in package.json (e.g., changing ^7.0.0 to ^8.0.0). Note that changing a range within the same major version (e.g., ^7.0.0 to ^7.1.0) will only update the metadata in the lockfile if the currently installed version still satisfies the new range.

In essence, package-lock.json locks your dependencies to specific versions, but package.json is the source of truth for acceptable version ranges. When the lockfile's versions satisfy the package.json ranges, the lockfile wins. When they conflict, package.json wins and the lockfile is updated.

If you want to install packages while ensuring that package.json is not modified and that both files are strictly in sync, use npm help ci instead.

A package is:

    •   a) a folder containing a program described by a \fBpackage.json\fR ⟨/configuring-npm/package-json⟩ file

    •   b) a gzipped tarball containing (a)

    •   c) a url that resolves to (b)

    •   d) a <name>@<version> that is published on the registry (see npm help registry) with (c)

    •   e) a <name>@<tag> (see npm help dist-tag) that points to (d)

    •   f) a <name> that has a "latest" tag satisfying (e)

    •   g) a <git remote url> that resolves to (a)

Even if you never publish your package, you can still get a lot of benefits of using npm if you just want to write a node program (a), and perhaps if you also want to be able to easily install it elsewhere after packing it up into a tarball (b).

    •   npm install (in a package directory, no arguments):

    Install the dependencies to the local node_modules folder.

    In global mode (ie, with -g or --global appended to the command), it installs the current package context (ie, the current working directory) as a global package.

    By default, npm install will install all modules listed as dependencies in \fBpackage.json\fR ⟨/configuring-npm/package-json⟩.

    With the --production flag (or when the NODE_ENV environment variable is set to production), npm will not install modules listed in devDependencies. To install all modules listed in both dependencies and devDependencies when NODE_ENV environment variable is set to production, you can use --production=false.

        NOTE: The --production flag has no particular meaning when adding a dependency to a project.

•   npm install <folder>:

If <folder> sits inside the root of your project, its dependencies will be installed and may be hoisted to the top-level node_modules as they would for other types of dependencies. If <folder> sits outside the root of your project, npm will not install the package dependencies in the directory <folder>, but it will create a symlink to <folder>.

    NOTE: If you want to install the content of a directory like a package from the registry instead of creating a link, you would need to use the --install-links option.

Example:

    npm install ../../other-package --install-links
    npm install ./sub-package

•   npm install <tarball file>:

Install a package that is sitting on the filesystem. Note: if you just want to link a dev directory into your npm root, you can do this more easily by using npm help link.

Tarball requirements:

    •   The filename must use .tar, .tar.gz, or .tgz as the extension.

    •   The package contents should reside in a subfolder inside the tarball (usually it is called package/). npm strips one directory layer when installing the package (an equivalent of tar x --strip-components=1 is run).

    •   The package must contain a package.json file with name and version properties.

Example:

    npm install ./package.tgz

•   npm install <tarball url>:

Fetch the tarball url, and then install it. In order to distinguish between this and other options, the argument must start with "http://" or "https://"

Example:

    npm install https://github.com/indexzero/forever/tarball/v0.5.6

•   npm install [<@scope>/]<name>:

Do a <name>@<tag> install, where <tag> is the "tag" config. (See \fBconfig\fR ⟨/using-npm/config#tag⟩. The config's default value is latest.)

In most cases, this will install the version of the modules tagged as latest on the npm registry.

Note: When installing by name without specifying a version or tag, npm prioritizes versions that match the current Node.js version based on the package's engines field. If the latest tag points to a version incompatible with your current Node.js version, npm will install the newest compatible version instead. To install a specific version regardless of engines compatibility, explicitly specify the version or tag: npm install <name>@latest.

Example:

    npm install sax

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.

    •   --save-peer: Package will appear in your peerDependencies.

    •   -O, --save-optional: Package will appear in your optionalDependencies.

    •   --no-save: Prevents saving to dependencies.

When using any of the above options to save dependencies to your package.json, there are two additional, optional flags:

    •   -E, --save-exact: Saved dependencies will be configured with an exact version rather than using npm's default semver range operator.

    •   -B, --save-bundle: Saved dependencies will also be added to your bundleDependencies list.

Further, if you have a package-lock.json then it will be updated as well.

<scope> is optional. The package will be downloaded from the registry associated with the specified scope. If no registry is associated with the given scope the default registry is assumed. See npm help scope.

Note: if you do not include the @-symbol on your scope name, npm will interpret this as a GitHub repository instead, see below. Scopes names must also be followed by a slash.

Examples:

    npm install sax
    npm install githubname/reponame
    npm install @myorg/privatepackage
    npm install node-tap --save-dev
    npm install dtrace-provider --save-optional
    npm install readable-stream --save-exact
    npm install ansi-regex --save-bundle

•   npm install <alias>@npm:<name>:

Install a package under a custom alias. Allows multiple versions of a same-name package side-by-side, more convenient import names for packages with otherwise long ones, and using git forks replacements or forked npm packages as replacements. Aliasing works only on your project and does not rename packages in transitive dependencies. Aliases should follow the naming conventions stated in \fBvalidate-npm-package-name\fR ⟨https://www.npmjs.com/package/validate-npm-package-name#naming-rules⟩.

Examples:

    npm install my-react@npm:react
    npm install jquery2@npm:jquery@2
    npm install jquery3@npm:jquery@3
    npm install npa@npm:npm-package-arg

•   npm install [<@scope>/]<name>@<tag>:

Install the version of the package that is referenced by the specified tag. If the tag does not exist in the registry data for that package, then this will fail.

Example:

    npm install sax@latest
    npm install @myorg/mypackage@latest

•   npm install [<@scope>/]<name>@<version>:

Install the specified version of the package. This will fail if the version has not been published to the registry.

Example:

    npm install sax@0.1.1
    npm install @myorg/privatepackage@1.5.0

•   npm install [<@scope>/]<name>@<version range>:

Install a version of the package matching the specified version range. This will follow the same rules for resolving dependencies described in \fBpackage.json\fR ⟨/configuring-npm/package-json⟩.

Note that most version ranges must be put in quotes so that your shell will treat it as a single argument.

Example:

    npm install sax@">=0.1.0 <0.2.0"
    npm install @myorg/privatepackage@"16 - 17"

Prerelease versions: By default, version ranges only match stable versions. To include prerelease versions, they must be explicitly specified in the range. Prerelease versions are tied to a specific version triple (major.minor.patch). For example, ^1.2.3-beta.1 will only match prereleases for 1.2.x, not 1.3.x. To match all prereleases for a major version, use a range like ^1.0.0-0, which will include all 1.x.x prereleases.

Example:

    npm install package@^1.2.3-beta.1  # Matches 1.2.3-beta.1, 1.2.3-beta.2, 1.2.4-beta.1, etc.
    npm install package@^1.0.0-0       # Matches all 1.x.x prereleases and stable versions

•   npm install <git remote url>:

Installs the package from the hosted git provider, cloning it with git. For a full git remote url, only that URL will be attempted.

    <protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>[#<commit-ish> | #semver:<semver>]

<protocol> is one of git, git+ssh, git+http, git+https, or git+file.

If #<commit-ish> is provided, it will be used to clone exactly that commit. If the commit-ish has the format #semver:<semver>, <semver> can be any valid semver range or exact version, and npm will look for any tags or refs matching that range in the remote repository, much as it would for a registry dependency. If neither #<commit-ish> or #semver:<semver> is specified, then the default branch of the repository is used.

If the repository makes use of submodules, those submodules will be cloned as well.

If the package being installed contains a prepare script, its dependencies and devDependencies will be installed, and the prepare script will be run, before the package is packaged and installed.

The following git environment variables are recognized by npm and will be added to the environment when running git:

    •   GIT_ASKPASS

    •   GIT_EXEC_PATH

    •   GIT_PROXY_COMMAND

    •   GIT_SSH

    •   GIT_SSH_COMMAND

    •   GIT_SSL_CAINFO

    •   GIT_SSL_NO_VERIFY

See the git man page for details.

Examples:

    npm install git+ssh://git@github.com:npm/cli.git#v1.0.27
    npm install git+ssh://git@github.com:npm/cli#pull/273
    npm install git+ssh://git@github.com:npm/cli#semver:^5.0
    npm install git+https://isaacs@github.com/npm/cli.git
    npm install git://github.com/npm/cli.git#v1.0.27
    GIT_SSH_COMMAND='ssh -i ~/.ssh/custom_ident' npm install git+ssh://git@github.com:npm/cli.git

•   npm install <githubname>/<githubrepo>[#<commit-ish>]:

•   npm install github:<githubname>/<githubrepo>[#<commit-ish>]:

Install the package at https://github.com/githubname/githubrepo by attempting to clone it using git.

If #<commit-ish> is provided, it will be used to clone exactly that commit. If the commit-ish has the format #semver:<semver>, <semver> can be any valid semver range or exact version, and npm will look for any tags or refs matching that range in the remote repository, much as it would for a registry dependency. If neither #<commit-ish> or #semver:<semver> is specified, then the default branch is used.

As with regular git dependencies, dependencies and devDependencies will be installed if the package has a prepare script before the package is done installing.

Examples:

    npm install mygithubuser/myproject
    npm install github:mygithubuser/myproject

•   npm install gist:[<githubname>/]<gistID>[#<commit-ish>|#semver:<semver>]:

Install the package at https://gist.github.com/gistID by attempting to clone it using git. The GitHub username associated with the gist is optional and will not be saved in package.json.

As with regular git dependencies, dependencies and devDependencies will be installed if the package has a prepare script before the package is done installing.

Example:

    npm install gist:101a11beef

•   npm install bitbucket:<bitbucketname>/<bitbucketrepo>[#<commit-ish>]:

Install the package at https://bitbucket.org/bitbucketname/bitbucketrepo by attempting to clone it using git.

If #<commit-ish> is provided, it will be used to clone exactly that commit. If the commit-ish has the format #semver:<semver>, <semver> can be any valid semver range or exact version, and npm will look for any tags or refs matching that range in the remote repository, much as it would for a registry dependency. If neither #<commit-ish> or #semver:<semver> is specified, then master is used.

As with regular git dependencies, dependencies and devDependencies will be installed if the package has a prepare script before the package is done installing.

Example:

    npm install bitbucket:mybitbucketuser/myproject

•   npm install gitlab:<gitlabname>/<gitlabrepo>[#<commit-ish>]:

Install the package at https://gitlab.com/gitlabname/gitlabrepo by attempting to clone it using git.

If #<commit-ish> is provided, it will be used to clone exactly that commit. If the commit-ish has the format #semver:<semver>, <semver> can be any valid semver range or exact version, and npm will look for any tags or refs matching that range in the remote repository, much as it would for a registry dependency. If neither #<commit-ish> or #semver:<semver> is specified, then master is used.

As with regular git dependencies, dependencies and devDependencies will be installed if the package has a prepare script before the package is done installing.

Example:

    npm install gitlab:mygitlabuser/myproject
    npm install gitlab:myusr/myproj#semver:^5.0

You may combine multiple arguments and even multiple types of arguments. For example:

    npm install sax@">=0.1.0 <0.2.0" bench supervisor

The --tag argument will apply to all of the specified install targets. If a tag with the given name exists, the tagged version is preferred over newer versions.

Note: The --tag option only affects packages specified on the command line. It does not override version ranges specified in package.json. For example, if package.json specifies "foo": "^1.0.0" and you run npm install --tag beta, npm will still install a version matching ^1.0.0 even if the beta tag points to a different version. To install a tagged version, specify the package explicitly: npm install foo@beta.

The --dry-run argument will report in the usual way what the install would have done without actually installing anything.

The --package-lock-only argument will only update the package-lock.json, instead of checking node_modules and downloading dependencies.

The -f or --force argument will force npm to fetch remote resources even if a local copy exists on disk.

    npm install sax --force

  Configuration

See the npm help config help doc. Many of the configuration params have some effect on installation, since that's most of what npm does.

These are some of the most common options related to installation.

  save

    •   Default: true unless when using npm update where it defaults to false

    •   Type: Boolean

Save installed packages to a package.json file as dependencies.

When used with the npm rm command, removes the dependency from package.json.

Will also prevent writing to package-lock.json if set to false.

  save-exact

    •   Default: false

    •   Type: Boolean

Dependencies saved to package.json will be configured with an exact version rather than using npm's default semver range operator.

  global

    •   Default: false

    •   Type: Boolean

Operates in "global" mode, so that packages are installed into the prefix folder instead of the current working directory. See npm help folders for more on the differences in behavior.

    •   packages are installed into the {prefix}/lib/node_modules folder, instead of the current working directory.

    •   bin files are linked to {prefix}/bin

    •   man pages are linked to {prefix}/share/man

  install-strategy

    •   Default: "hoisted"

    •   Type: "hoisted", "nested", "shallow", or "linked"

Sets the strategy for installing packages in node_modules. hoisted (default): Install non-duplicated in top-level, and duplicated as necessary within directory structure. nested: (formerly --legacy-bundling) install in place, no hoisting. shallow (formerly --global-style) only install direct deps at top-level. linked: install in node_modules/.store, link in place, unhoisted.

We recommend that package authors use --install-strategy=linked during development to catch undeclared ("phantom") dependencies before publishing: the isolated layout only exposes a package's declared dependencies, so an import of a package that was never added to package.json can fail instead of resolving by accident and shipping broken. See Catching undeclared ("phantom") dependencies ⟨/using-npm/developers#catching-undeclared-phantom-dependencies⟩.

  legacy-bundling

    •   Default: false

    •   Type: Boolean

    •   DEPRECATED: This option has been deprecated in favor of --install-strategy=nested

Instead of hoisting package installs in node_modules, install packages in the same manner that they are depended on. This may cause very deep directory structures and duplicate package installs as there is no de-duplicating. Sets --install-strategy=nested.

  global-style

    •   Default: false

    •   Type: Boolean

    •   DEPRECATED: This option has been deprecated in favor of --install-strategy=shallow

Only install direct dependencies in the top level node_modules, but hoist on deeper dependencies. Sets --install-strategy=shallow.

  omit

    •   Default: 'dev' if the NODE_ENV environment variable is set to 'production'; otherwise, empty.

    •   Type: "dev", "optional", or "peer" (can be set multiple times)

Dependency types to omit from the installation tree on disk.

Note that these dependencies are still resolved and added to the package-lock.json file. They are just not physically installed on disk.

If a package type appears in both the --include and --omit lists, then it will be included.

If the resulting omit list includes 'dev', then the NODE_ENV environment variable will be set to 'production' for all lifecycle scripts.

  include

    •   Default:

    •   Type: "prod", "dev", "optional", or "peer" (can be set multiple times)

Option that allows for defining which types of dependencies to install.

This is the inverse of --omit=<type>.

Dependency types specified in --include will not be omitted, regardless of the order in which omit/include are specified on the command-line.

  strict-peer-deps

    •   Default: false

    •   Type: Boolean

If set to true, and --legacy-peer-deps is not set, then any conflicting peerDependencies will be treated as an install failure, even if npm could reasonably guess the appropriate resolution based on non-peer dependency relationships.

By default, conflicting peerDependencies deep in the dependency graph will be resolved using the nearest non-peer dependency specification, even if doing so will result in some packages receiving a peer dependency outside the range set in their package's peerDependencies object.

When such an override is performed, a warning is printed, explaining the conflict and the packages involved. If --strict-peer-deps is set, then this warning is treated as a failure.

  prefer-dedupe

    •   Default: false

    •   Type: Boolean

Prefer to deduplicate packages if possible, rather than choosing a newer version of a dependency.

  package-lock

    •   Default: true

    •   Type: Boolean

If set to false, then ignore package-lock.json files when installing. This will also prevent writing package-lock.json if save is true.

  package-lock-only

    •   Default: false

    •   Type: Boolean

If set to true, the current operation will only use the package-lock.json, ignoring node_modules.

For update this means only the package-lock.json will be updated, instead of checking node_modules and downloading dependencies.

For list this means the output will be based on the tree described by the package-lock.json, rather than the contents of node_modules.

  foreground-scripts

    •   Default: false unless when using npm pack or npm publish where it defaults to true

    •   Type: Boolean

Run all build scripts (ie, preinstall, install, and postinstall) scripts for installed packages in the foreground process, sharing standard input, output, and error with the main npm process.

Note that this will generally make installs run slower, and be much noisier, but can be useful for debugging.

  ignore-scripts

    •   Default: false

    •   Type: Boolean

If true, npm does not run scripts specified in package.json files.

Note that commands explicitly intended to run a particular script, such as npm start, npm stop, npm restart, npm test, and npm run will still run their intended script if ignore-scripts is set, but they will not run any pre- or post-scripts.

Setting ignore-scripts also disables .npm-extension execution, as if ignore-extension were set.

  allow-directory

    •   Default: "all"

    •   Type: "all", "none", or "root"

Limits the ability for npm to install dependencies from directories. That is, dependencies that point to a directory instead of a version or semver range. Please note that this could leave your tree incomplete and some packages may not function as intended or designed. Changing this setting will not remove dependencies that are already installed.

all allows any directories to be installed. none prevents any directories from being installed. root only allows directories defined in your project's package.json to be installed. Also allows directory dependencies to be used for other commands like npm view

  allow-file

    •   Default: "all"

    •   Type: "all", "none", or "root"

Limits the ability for npm to install dependencies from tarball files. That is, dependencies that point to a local tarball file instead of a version or semver range. Please note that this could leave your tree incomplete and some packages may not function as intended or designed. Changing this setting will not remove dependencies that are already installed.

all allows any tarball file to be installed. none prevents any tarball file from being installed. root only allows tarball files defined in your project's package.json to be installed. Also allows tarball file dependencies to be used for other commands like npm view

  allow-git

    •   Default: "none"

    •   Type: "all", "none", or "root"

Limits the ability for npm to fetch dependencies from git references. That is, dependencies that point to a git repo instead of a version or semver range. Please note that this could leave your tree incomplete and some packages may not function as intended or designed. Changing this setting will not remove dependencies that are already installed.

As of npm 12 the default is none. Git dependencies run git against a remote repo and may install configuration the project does not control. Opt in explicitly per project (in .npmrc) or per command (on the CLI) when you need git deps.

all allows any git dependencies to be fetched and installed. none prevents any git dependencies from being fetched and installed. root only allows git dependencies defined in your project's package.json to be fetched and installed. Also allows git dependencies to be fetched for other commands like npm view

  allow-remote

    •   Default: "none"

    •   Type: "all", "none", or "root"

Limits the ability for npm to fetch dependencies from urls. That is, dependencies that point to a tarball url instead of a version or semver range. Please note that this could leave your tree incomplete and some packages may not function as intended or designed. Changing this setting will not remove dependencies that are already installed.

As of npm 12 the default is none. Tarballs that share a hostname with the configured registry (the typical case for the npm registry, GitHub Packages, and most private registries) are still installed normally. If your registry serves tarballs from a different host, set replace-registry-host or override this setting. Opt in explicitly per project (in .npmrc) or per command (on the CLI) when you intentionally install from a URL.

all allows any url to be installed. none prevents any url from being installed. root only allows urls defined in your project's package.json to be installed. Also allows url dependencies to be used for other commands like npm view

  allow-scripts

    •   Default: ""

    •   Type: String (can be set multiple times)

Comma-separated list of packages whose install-time lifecycle scripts (preinstall, install, postinstall, and prepare for non-registry dependencies) are allowed to run.

This setting is intended for one-off and global contexts: npm exec, npx, and npm install -g, where no project package.json is involved. For team-wide policy in a project, use the allowScripts field in package.json (which also supports explicit denials), or configure it in .npmrc. Passing --allow-scripts on the command line during a project-scoped npm install, ci, update, or rebuild is an error.

Each name is matched against a dependency's resolved identity, not against the package's self-reported name. --ignore-scripts and --dangerously-allow-all-scripts both override this setting.

  strict-allow-scripts

    •   Default: false

    •   Type: Boolean

If true, turn the install-script policy from a warning into a hard error: any dependency with install scripts that is not covered by allowScripts will fail the install instead of being blocked with a warning.

Dependencies explicitly denied with false in allowScripts are always silently skipped; this setting only affects unreviewed entries (packages with install scripts that are neither approved nor denied). --ignore-scripts and --dangerously-allow-all-scripts both override this setting.

Optional dependencies that cannot be installed on the current platform or engine (a non-matching os, cpu, or libc) are not flagged, because their install scripts never run.

  dangerously-allow-all-scripts

    •   Default: false

    •   Type: Boolean

If true, bypass the allowScripts policy entirely and run every dependency install script regardless of whether it was approved or denied. Intended as a migration escape hatch only; its use is strongly discouraged. --ignore-scripts still takes precedence over this setting.

  audit

    •   Default: true

    •   Type: Boolean

When "true" submit audit reports alongside the current npm command to the default registry and all registries configured for scopes. See the documentation for npm help audit for details on what is submitted.

  before

    •   Default: null

    •   Type: null or Date

If passed to npm install, will rebuild the npm tree such that only versions that were available on or before the given date are installed. If there are no versions available for the current set of dependencies, the command will error.

If the requested version is a dist-tag and the given tag does not pass the --before filter, the most recent version less than or equal to that tag will be used. For example, foo@latest might install foo@1.2 even though latest is 2.0.

If before and min-release-age are both set in the same source, before wins (an explicit absolute date overrides a relative window). Across sources, the standard precedence applies (cli > env > project > user > global), so a higher-priority source can always relax or override a lower-priority one.

As with min-release-age, when this cutoff blocks a fix that npm audit fix would install, npm keeps the vulnerable version, warns, and exits with a non-zero code.

Packages whose names match min-release-age-exclude are exempt from this filter.

  min-release-age

    •   Default: null

    •   Type: null or Number

If set, npm will build the npm tree such that only versions that were available more than the given number of days ago will be installed. If there are no versions available for the current set of dependencies, the command will error.

This flag is a complement to before, which accepts an exact date instead of a relative number of days. The two may coexist (e.g. min-release-age in your .npmrc is preserved when npm internally spawns a sub-process with --before while preparing a git: or github: dependency); when both apply, before wins within a single source and across sources the standard precedence rules apply.

When this window stops npm audit fix from installing a patched version (because the fix was published too recently), npm keeps the package at its vulnerable version, warns that the fix was blocked, and exits with a non-zero code. To install the fix, add the package to min-release-age-exclude, or relax min-release-age or before.

Packages whose names match min-release-age-exclude are exempt from this filter.

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

  min-release-age-exclude

    •   Default:

    •   Type: String (can be set multiple times)

A list of package names or minimatch glob patterns that are exempt from the min-release-age (and before) filter. A matching package can always resolve to its newest version, even when a release-age window is set.

For example, to apply a release-age window to third-party dependencies while letting internally maintained packages update immediately:

    min-release-age=7
    min-release-age-exclude[]=@myorg/*
    min-release-age-exclude[]=my-internal-pkg

Only the named package is exempt; its own dependencies still follow the release-age policy unless they also match a pattern. Patterns match against the package name, so @myorg/* matches @myorg/shared-utils.

Excluding a package does not change which registry it is fetched from. You should own your private scope on the public registry so that nobody else can publish a package with the same name.

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

  bin-links

    •   Default: true

    •   Type: Boolean

Tells npm to create symlinks (or .cmd shims on Windows) for package executables.

Set to false to have it not do this. This can be used to work around the fact that some file systems don't support symlinks, even on ostensibly Unix systems.

  fund

    •   Default: true

    •   Type: Boolean

When "true" displays the message at the end of each npm install acknowledging the number of dependencies looking for funding. See npm help fund for details.

  dry-run

    •   Default: false

    •   Type: Boolean

Indicates that you don't want npm to make any changes and that it should only report what it would have done. This can be passed into any of the commands that modify your local installation, eg, install, update, dedupe, uninstall, as well as pack and publish.

Note: This is NOT honored by other network related commands, eg dist-tags, owner, etc.

  cpu

    •   Default: null

    •   Type: null or String

Override CPU architecture of native modules to install. Acceptable values are same as cpu field of package.json, which comes from process.arch.

  os

    •   Default: null

    •   Type: null or String

Override OS of native modules to install. Acceptable values are same as os field of package.json, which comes from process.platform.

  libc

    •   Default: null

    •   Type: null or String

Override libc of native modules to install. Acceptable values are same as libc field of package.json

  workspace

    •   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 in selecting all workspaces within that folder)

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

    •   Default: null

    •   Type: null or Boolean

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:

    •   Commands that operate on the node_modules tree (install, update, etc.) will link workspaces into the node_modules folder. - Commands that do other things (test, exec, publish, etc.) will operate on the root project, unless one or more workspaces are specified in the workspace config.

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

  include-workspace-root

    •   Default: false

    •   Type: Boolean

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.

  install-links

    •   Default: false

    •   Type: Boolean

When set file: protocol dependencies will be packed and installed as regular dependencies instead of creating a symlink. This option has no effect on workspaces.

  Algorithm

Given a package{dep} structure: A{B,C}, B{C}, C{D}, the npm install algorithm produces:

    A
    +-- B
    +-- C
    +-- D

That is, the dependency from B to C is satisfied by the fact that A already caused C to be installed at a higher level. D is still installed at the top level because nothing conflicts with it.

For A{B,C}, B{C,D@1}, C{D@2}, this algorithm produces:

    A
    +-- B
    +-- C
       `-- D@2
    +-- D@1

Because B's D@1 will be installed in the top-level, C now has to install D@2 privately for itself. This algorithm is deterministic, but different trees may be produced if two dependencies are requested for installation in a different order.

See npm help folders for a more detailed description of the specific folder structures that npm creates.

  See Also

    •   npm help folders

    •   npm help update

    •   npm help audit

    •   npm help fund

    •   npm help link

    •   npm help rebuild

    •   npm help scripts

    •   npm help config

    •   npm help npmrc

    •   npm help registry

    •   npm help dist-tag

    •   npm help uninstall

    •   package.json ⟨/configuring-npm/package-json⟩

    •   npm help workspaces