Azure Cosmos DB + Functions Cookbook - live migration function.json

function.json

{
  "bindings": [
    {
      "type": "cosmosDBTrigger",
      "name": "input",
      "direction": "in",
      "databaseName": "<name-of-your-monitored-database>",
      "collectionName": "<name-of-your-monitored-collection>",
      "connectionStringSetting": "<name-of-connection-string-setting>",
      "leaseCollectionName": "leases",
      "createLeaseCollectionIfNotExists": true
    },
    {
      "type": "documentDB",
      "direction": "out",
      "name": "docsToSave",
      "databaseName": "<name-of-your-target-database>",
      "collectionName": "<name-of-your-target-collection>",
      "connection": "<name-of-connection-string-setting-to-target-collection>",
      "createIfNotExists": false
    }
  ]
}