# Accessing Data

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## Accessing API Data from your extensions

For examples on how to access collections and fields in the API from within your custom extensions, see the [Layout](/guides/layouts/) and [Module](/guides/modules/) guides.

## Storing Sensitive Extension Variables

If your extension requires storing sensitive data, such as an API Key, you can store that information in
[custom environment variables](#). This data can then be accessed globally by server-side extensions (eg: custom hooks
or endpoints). If you need access to that private data on the client-side (eg: custom interfaces or displays), then you
would expose that env variable via a custom endpoint with proper limitations.