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---
title: npm-install
section: 1
description: Install a package
---
### Synopsis
```bash
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](/configuring-npm/package-lock-json) and [`npm shrinkwrap`](/commands/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`](/commands/npm-ci) instead.
A `package` is:
* a) a folder containing a program described by a [`package.json`](/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 [`registry`](/using-npm/registry)) with (c)
* e) a `<name>@<tag>` (see [`npm dist-tag`](/commands/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`](/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:
```bash
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`](/commands/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:
```bash
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:
```bash
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`](/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:
```bash
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`](/using-npm/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:
```bash
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`](https://www.npmjs.com/package/validate-npm-package-name#naming-rules).
Examples:
```bash
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:
```bash
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:
```bash
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`](/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:
```bash
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:
```bash
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.
```bash
<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:
```bash
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:
```bash
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:
```bash
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:
```bash
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:
```bash
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:
```bash
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.
```bash
npm install sax --force
```
### Configuration
See the [`config`](/using-npm/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](/configuring-npm/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`](/commands/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.
#### `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.
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`](/commands/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:
```bash
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:
```bash
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](/configuring-npm/folders) for a more detailed description of the specific folder structures that npm creates.
### See Also
* [npm folders](/configuring-npm/folders)
* [npm update](/commands/npm-update)
* [npm audit](/commands/npm-audit)
* [npm fund](/commands/npm-fund)
* [npm link](/commands/npm-link)
* [npm rebuild](/commands/npm-rebuild)
* [npm scripts](/using-npm/scripts)
* [npm config](/commands/npm-config)
* [npmrc](/configuring-npm/npmrc)
* [npm registry](/using-npm/registry)
* [npm dist-tag](/commands/npm-dist-tag)
* [npm uninstall](/commands/npm-uninstall)
* [npm shrinkwrap](/commands/npm-shrinkwrap)
* [package.json](/configuring-npm/package-json)
* [workspaces](/using-npm/workspaces)