# Registry {#registry}

As the number of dependencies grows, so does the time to resolve them. While
other package managers like [CocoaPods](https://cocoapods.org/) or
[npm](https://www.npmjs.com/) are centralized, Swift Package Manager is not.
Because of that, SwiftPM needs to resolve dependencies by doing a deep clone of
each repository, which can be time-consuming and takes up more memory than a
centralized approach would. To address this, Tuist provides an implementation of
the [Package
Registry](https://github.com/swiftlang/swift-package-manager/blob/main/Documentation/PackageRegistry/PackageRegistryUsage.md),
so you can download only the commits you _actually need_. The packages in the
registry are based on the [Swift Package Index](https://swiftpackageindex.com/)
– if you can find a package there, the package is also available in the Tuist
Registry. Additionally, the packages are distributed across the globe using an
edge storage for minimum latency when resolving them.

## Usage {#usage}

To set up the registry, run the following command in your project's directory:

```bash
tuist registry setup
```

This command generates a registry configuration file that enables the registry
for your project. Ensure this file is committed so your team can also benefit
from the registry.

### Authentication (optional) {#authentication}

Authentication is **optional**. Without authentication, you can use the registry
with a rate limit of **1,000 requests per minute** per IP address. To get a
higher rate limit of **20,000 requests per minute**, you can authenticate by
running:

```bash
tuist registry login
```

::: info
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Authentication requires a
<LocalizedLink href="/guides/server/accounts-and-projects">Tuist account and project</LocalizedLink>.
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:::

### Resolving dependencies {#resolving-dependencies}

To resolve dependencies from the registry instead of from source control,
continue reading based on your project setup:
- <LocalizedLink href="/guides/features/registry/xcode-project">Xcode project</LocalizedLink>
- <LocalizedLink href="/guides/features/registry/generated-project">Generated project with the Xcode package integration</LocalizedLink>
- <LocalizedLink href="/guides/features/registry/xcodeproj-integration">Generated project with the XcodeProj-based package integration</LocalizedLink>
- <LocalizedLink href="/guides/features/registry/swift-package">Swift package</LocalizedLink>

To set up the registry on the CI, follow this guide:
<LocalizedLink href="/guides/features/registry/continuous-integration">Continuous integration</LocalizedLink>.

### Package registry identifiers {#package-registry-identifiers}

When you use package registry identifiers in a `Package.swift` or
`Project.swift` file, you need to convert the URL of the package to the registry
convention. The registry identifier is always in the form of
`{organization}.{repository}`. For example, to use the registry for the
`https://github.com/pointfreeco/swift-composable-architecture` package, the
package registry identifier would be
`pointfreeco.swift-composable-architecture`.

::: info
<!-- -->
The identifier can't contain more than one dot. If the repository name contains
a dot, it's replaced with an underscore. For example, the
`https://github.com/groue/GRDB.swift` package would have the registry identifier
`groue.GRDB_swift`.
<!-- -->
:::