The Forge Fetch API is a partial implementation of undici, which fetches data from an HTTP server. In the most basic use, fetch is a simple HTTP client. See Basic fetch client for more information.

However, fetch also supports multiple options for managed authentication to remote APIs:

Atlassian app authentication

You can also make requests directly to an Atlassian app's REST API through the following fetch endpoints:

requestBitbucket
requestConfluence
requestJira
requestGraph (for Compass and other APIs exposed through the Atlassian GraphQL Gateway)

External authentication

The withProvider method enables your Forge app to communicate with an API that requires OAuth 2.0 tokens. Access is via the asUser method, in the @forge/api package. See External authentication for more information.