Azure Cosmos DB + Functions Cookbook - output collector function.json

function.json

{
  "bindings": [
    {
      "name": "classes",
      "type": "httpTrigger",
      "direction": "in"
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "type": "documentDB",
      "name": "documentsToStore",
      "databaseName": "<your-database-name>",
      "collectionName": "<your-collection-name>",
      "createIfNotExists": false,
      "connection": "<your-connection-setting-name>",
      "direction": "out"
    }
  ]
}