node/deps/npm/docs/content/commands/npm-install.md

---
title: npm-install
section: 1
description: Install a package
---

### Synopsis

```bash
npm install (with no args, in package dir)
npm install [<@scope>/]<name>
npm install [<@scope>/]<name>@<tag>
npm install [<@scope>/]<name>@<version>
npm install [<@scope>/]<name>@<version range>
npm install <alias>@npm:<name>
npm install <git-host>:<git-user>/<repo-name>
npm install <git repo url>
npm install <tarball file>
npm install <tarball url>
npm install <folder>

aliases: npm i, npm add
common options: [-P|--save-prod|-D|--save-dev|-O|--save-optional|--save-peer] [-E|--save-exact] [-B|--save-bundle] [--no-save] [--dry-run]
```

### 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).

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 in 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>`:

    Install the package in the directory as a symlink in the current
    project.  Its dependencies will be installed before it's linked. If
    `<folder>` sits inside the root of your project, its dependencies may
    be hoisted to the top-level `node_modules` as they would for other
    types of dependencies.

* `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). 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:

    ```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`.

    * `-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
    ```

    **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`](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"
    ```

* `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 `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.

    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.

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.

#### Configuration Options Affecting Dependency Resolution And Tree Design

* `-g` or `--global`: install the package globally rather than locally.
  See [folders](/configuring-npm/folders).

* `--global-style`: install the package into your local `node_modules`
  folder with the same layout it uses with the global `node_modules`
  folder. Only your direct dependencies will show in `node_modules` and
  everything they depend on will be flattened in their `node_modules`
  folders. This obviously will eliminate some deduping.

* `--legacy-bundling`: install the package in the style of versions of npm
  prior to 1.4, where dependencies are not automatically deduped up to the
  shallowest level in the tree possible.  This is extremely
  disk-inefficient.

* `--legacy-peer-deps`: ignore all `peerDependencies` when installing, in
  the style of npm version 4 through version 6.

* `--strict-peer-deps`: fail and abort the install process for any
  conflicting peerDependencies when encountered.  By default, npm will only
  crash for peerDependencies conflicts caused by the direct dependencies of
  the root project.

* `--no-package-lock` (alias: `--no-shrinkwrap`): do not read the
  lockfile (`package-lock.json` or `npm-shrinkwrap.json`) for the intended
  package tree, and do not save the resulting package tree back to a
  lockfile.

#### Omitting Dependency Types

You may omit certain types of dependencies by using the `--omit=<type>`
config option.  This may be specified multiple types on the command line.
To enter `omit` options in `.npmrc` files, use the following syntax:

```ini
omit[] = dev
omit[] = optional
; etc...
```

The dependency types that may be omitted or included are:

* `peer`: any `peerDependencies`, including those with a
  `peerDependenciesMeta` entry specifying `optional: true`
* `optional`: dependencies listed in `optionalDependencies`
* `dev`: dependencies listed in `devDependencies`

To re-include dependency, use the `--include` option, which may also be
specified multiple times.

Legacy shorthands for `omit` settings are:

* `--no-optional`: prevent optionalDependencies from being installed.  Note
  that their presence is still entered in the `package-lock.json` file, and
  the tree is designed such that they _can_ be installed in the future.

* `--prod`: prevent devDependencies from being installed.

* `--only=prod`: omit `devDependencies`

* `--also=dev`: include `devDependencies`

#### Configuration Options Affecting Build Process

* `--ignore-scripts`: do not execute any scripts defined in the
  package.json. See [`scripts`](/using-npm/scripts).

* `--no-audit`: disable sending audit reports to the configured registries.
  See [`npm-audit`](npm-audit) for details on what is sent.

* `--no-bin-links`: prevent npm from creating symlinks for any binaries the
  package might contain.

* `--no-fund`: suppress the message displayed at the end of each install
  that acknowledges the number of dependencies looking for funding.  See
  [`npm-fund`](/commands/npm-fund)

* `--dry-run`: Do not actually install anything into the `node_modules`
  folder.  Just build the intended tree in memory, and report on it.

* `--no-save`: Do not save installed dependencies to `package.json` or
  `package-lock.json`.

### 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 build](/commands/npm-build)
* [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)