npmjs.com

package-lock.json

A manifestation of the manifest

Description

package-lock.json is automatically generated for any operations where npm modifies either the node_modules tree, or package.json. It describes the exact tree that was generated, such that subsequent installs are able to generate identical trees, regardless of intermediate dependency updates.

This file is intended to be committed into source repositories, and serves various purposes:

One key detail about package-lock.json is that it cannot be published, and it will be ignored if found in any place other than the toplevel package. It shares a format with npm-shrinkwrap.json, which is essentially the same file, but allows publication. This is not recommended unless deploying a CLI tool or otherwise using the publication process for producing production packages.

If both package-lock.json and npm-shrinkwrap.json are present in the root of a package, package-lock.json will be completely ignored.

FILE FORMAT

name

The name of the package this is a package-lock for. This must match what's in package.json.

version

The version of the package this is a package-lock for. This must match what's in package.json.

lockfileVersion

An integer version, starting at 1 with the version number of this document whose semantics were used when generating this package-lock.json.

packageIntegrity

This is a subresource integrity value created from the package.json. No preprocessing of the package.json should be done. Subresource integrity strings can be produced by modules like ssri.

preserveSymlinks

Indicates that the install was done with the environment variable NODE_PRESERVE_SYMLINKS enabled. The installer should insist that the value of this property match that environment variable.

dependencies

A mapping of package name to dependency object. Dependency objects have the following properties:

version

This is a specifier that uniquely identifies this package and should be usable in fetching a new copy of it.

integrity

This is a Standard Subresource Integrity for this resource.

resolved

bundled

If true, this is the bundled dependency and will be installed by the parent module. When installing, this module will be extracted from the parent module during the extract phase, not installed as a separate dependency.

dev

If true then this dependency is either a development dependency ONLY of the top level module or a transitive dependency of one. This is false for dependencies that are both a development dependency of the top level and a transitive dependency of a non-development dependency of the top level.

optional

If true then this dependency is either an optional dependency ONLY of the top level module or a transitive dependency of one. This is false for dependencies that are both an optional dependency of the top level and a transitive dependency of a non-optional dependency of the top level.

All optional dependencies should be included even if they're uninstallable on the current platform.

dependencies

The dependencies of this dependency, exactly as at the top level.

See Also

Last modified August 23, 2017           Found a typo? Send a pull request!

npm Services

Getting Started

How npm works

Private Modules

Troubleshooting

Using npm

CLI Commands

Configuring npm

npm policy documents

View All On One Page