A package is a container that holds any combination of Assets, Shaders, Textures, plug-ins, icons, and scripts that enhance various parts of your project. Unity packages are newer, more tightly integrated versions of Asset Store packages, able to deliver a wide range of enhancements to Unity.
Use the Unity Package Manager window (in Unity’s top menu: Window > Package Manager) to view which packages are available for installation or already installed in your project. In addition, you can use this window to install, remove, or update packages for each project.
The Package Manager window displays a list view on the left and a detail view on the right.
Finding packages
By default, the Package Manager window displays the list of packages in the In Project mode, so that only the packages already installed in your project appear in the list.
To expand the list to include all available packages, click the All button. The list now displays everything registered in the package registry, regardless of whether they are already installed in the project.
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Viewing package details
The pane on the right side of the Package Manager window displays details about the selected package.
These details include the following information:
Version tags
Some packages display tags next to the version number. These tags convey information about that version of the package.
The Package Manager uses the following values:
A Package without a tag is considered production quality.
Finding more information
You can find out more about a package by viewing its documentation.
To access it, click the View Documentation link in the Details pane:
The package documentation page opens in your default browser.
Accessing the Package Manager window![]()
You can perform a variety of tasks through the Package Manager window:
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Installing a new package
To install a new package:
Removing an installed package
To remove an installed package:
Notes:
Updating an installed package
You can update a package while in either the In Project or All mode:
Advanced package topics
This section provides more advanced information about the package manifest file. You don't need to know anything about these topics to install, remove, and update packages.
In addition to its contents (Assets, Shaders, Textures, plug-ins, icons and scripts), a Unity package contains a package manifest file. The package manifest tells Unity how to display its information page in the Package Manager window, and how to install the package in the project.
In addition, it contains several files that help manage the package deployment, including the tests, the samples, the license, the changelog, and the documentation.
Manifests
There are two types of manifest files: project manifests (
manifest.json ), and package manifests (package.json ). Both files use JSON (JavaScript Object Notation) syntax to communicate with the Package Manager, by describing which packages are available for each project, and what each package contains.
Project manifests
Project manifests (
manifest.json ) tell the Package Manager which packages and versions are available to the project.
Project manifests support the following value:
Example of a
manifest.json file:
Unity stores each project manifest in the
[your_project_root_folder]/Packages/manifest.json file.
Package manifests
The Package Manager uses package manifests (
package.json ) to determine which version of the package to load, and what information to display in the Package Manager window.
Package manifests support the following values:
Example of a
package.json file:
Unity stores each package manifest in the
[your_package_root_folder]/package.json file.
The Package Registry
Unity maintains a central registry of official packages that are available for distribution. When Unity loads, the Package Manager communicates with the registry, checks the project manifest file, and displays the status of each available package in the Package Manager window.
When you remove a package from the project, the Package Manager updates the project manifest to exclude that package from the list in In Project mode but it is still available in All mode because it is still on the registry.
When you install or update a package, the Package Manager downloads the package from the registry.
Requirements
This version of Unity Package Manager is compatible with the following versions of the Unity Editor:
Known limitations
The Package Manager includes the following known limitations:
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