npm-install

Install a package

Synopsis
Description
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
audit
bin-links
fund
dry-run
cpu
os
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.

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.

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.
- -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
```
Note: If there is a file or folder named <name> in the current working directory, then it will try to install that, and only try to fetch the package by name if it is not valid.
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 [email protected]
npm install @myorg/[email protected]
```
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"
```
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://[email protected]:npm/cli.git#v1.0.27
npm install git+ssh://[email protected]:npm/cli#pull/273
npm install git+ssh://[email protected]:npm/cli#semver:^5.0
npm install git+https://[email protected]/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://[email protected]: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.

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
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-script will still run their intended script if ignore-scripts is set, but they will not run any pre- or post-scripts.

`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.

`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.

`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.

Table of contents

Synopsis

Description

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

audit

bin-links

fund

dry-run

cpu

os

workspace

workspaces

include-workspace-root

install-links

Algorithm

See Also

`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`

`audit`

`bin-links`

`fund`

`dry-run`

`cpu`

`os`

`workspace`

`workspaces`

`include-workspace-root`

`install-links`