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:
See package-lock.json and
npm shrinkwrap.
A package is:
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).
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.
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NOTE: The --production flag has no particular meaning when adding a
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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>.
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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.
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Example:
npm install ../../other-package --install-links npm install ./sub-package
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:
Example:
npm install ./package.tgz
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
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:
When using any of the above options to save dependencies to your
package.json, there are two additional, optional flags:
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.
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
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
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
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"
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:
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
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
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
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
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
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. <!-- AUTOGENERATED CONFIG DESCRIPTIONS -->
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.