Connecting Azure Functions to Cosmos DB

Azure Functions

Cosmos DB works exceptionally well in a serverless architecture thanks to its change feed and binding for Azure Functions. In this lesson, we’ll see a realistic example of architecture and code for the following:

• Triggers

• Input binding

• Output binding

Triggers

A trigger starts an Azure Function. For example, a trigger can be an HTTP request or a timer. In our case, we want to listen to container changes, and to do so, we need to use CosmosDBTrigger. The function is called automatically when documents change in a container.

The trigger requires some parameters to work:

• databaseName ...