npm-install

npm command-line interface

# npm-install @11.17.0

Install a package

## Table of contents

- Synopsis
- Description

- How `npm install` uses `package-lock.json`

- Configuration

- `save`
- `save-exact`
- `global`
- `install-strategy`
- `legacy-bundling`
- `global-style`
- `omit`
- `include`
- `strict-peer-deps`
- `prefer-dedupe`
- `package-lock`
- `package-lock-only`
- `foreground-scripts`
- `ignore-scripts`
- `allow-directory`
- `allow-file`
- `allow-git`
- `allow-remote`
- `allow-scripts`
- `strict-allow-scripts`
- `dangerously-allow-all-scripts`
- `audit`
- `before`
- `min-release-age`
- `min-release-age-exclude`
- `bin-links`
- `fund`
- `dry-run`
- `cpu`
- `os`
- `libc`
- `workspace`
- `workspaces`
- `include-workspace-root`
- `install-links`

- Algorithm
- See Also

### 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 an npm shrinkwrap file, or a yarn lock file, the installation of dependencies will be driven by that, respecting the following order of precedence:

- `npm-shrinkwrap.json`
- `package-lock.json`
- `yarn.lock`

See package-lock.json and `npm shrinkwrap`.

#### 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 ci` instead.

A `package` is:

- a) a folder containing a program described by a `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 `registry`) with (c)
- e) a `<name>@<tag>` (see `npm 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 `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 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 `config`. 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 an `npm-shrinkwrap.json` or `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 `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 `validate-npm-package-name`.

  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 `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 `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 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: (experimental) install in node_modules/.store, link in place, unhoisted.

#### `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` or `npm-shrinkwrap.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.

#### `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: "all"
- 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.

`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: "all"
- 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.

`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 not covered by `allowScripts` will fail the install instead of running with a notice.

Dependencies explicitly denied with `false` in `allowScripts` are always silently skipped; this setting only affects unreviewed entries. `--ignore-scripts` and `--dangerously-allow-all-scripts` both override this setting.

#### `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 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.

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.

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

### See Also

- npm folders
- npm update
- npm audit
- npm fund
- npm link
- npm rebuild
- npm scripts
- npm config
- npmrc
- npm registry
- npm dist-tag
- npm uninstall
- npm shrinkwrap
- package.json
- workspaces