To simplify integration with other applications, Hyperledger Composer provides the Composer REST server, an API server built on top of a LoopBack framework that connects to the business network defined. It retrieves information on assets, transactions, and participants, and provides a REST API server and and the service contract described in swagger format to interact with the business network out of the box.

The Composer REST server ships with many useful features. The ones that are most worth taking a look at are authentication, multiuser mode, and data source configuration.