> For the complete documentation index, see [llms.txt](https://awsnotes.dendron.so/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://awsnotes.dendron.so/developer-tools/aws-codeartifact/topics/using-npm.md).

# Using npm

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-codeartifact-user-guide.git)
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## Configure and use npm

* **Note**\
  If you are accessing a repository in a domain that you own, you don't need to include `--domain-owner`. For more information, see [Cross-account domains](https://github.com/kevinslin/aws-reference-notes/blob/main/services/aws_code_artifact/domain-overview.md#domain-overview-cross-account).
* **Important**\
  The registry URL must end with a forward slash (/). Otherwise, you cannot connect to the repository.

## Configure and use Yarn

* **Note**\
  `Yarn 1.X` reads and uses information from your npm configuration file (.npmrc), while `Yarn 2.X` does not. The configuration for `Yarn 2.X` must be defined in the .yarnrc.yml file.

## Support for npm-compatible package managers

* **Note**\
  We recommend using Yarn 2.x with CodeArtifact. Yarn 1.x does not have HTTP retries, which means it is more susceptible to intermittent service faults which result in 500-level status codes or errors. There is no way to configure a different retry strategy for Yarn 1.x, but this has been added in Yarn 2.x. You can use Yarn 1.x, but you may need to add higher-level retries in build scripts. For example, running your yarn command in a loop so that it will retry if downloading packages fails.