FulfillmentActivity - Amazon Lex V1

If you are using Amazon Lex V2, refer to the Amazon Lex V2 guide instead.


If you are using Amazon Lex V1, we recommend upgrading your bots to Amazon Lex V2. We are no longer adding new features to V1 and strongly recommend using V2 for all new bots.


Describes how the intent is fulfilled after the user provides all of the information required for the intent. You can provide a Lambda function to process the intent, or you can return the intent information to the client application. We recommend that you use a Lambda function so that the relevant logic lives in the Cloud and limit the client-side code primarily to presentation. If you need to update the logic, you only update the Lambda function; you don't need to upgrade your client application.

Consider the following examples:

  • In a pizza ordering application, after the user provides all of the information for placing an order, you use a Lambda function to place an order with a pizzeria.

  • In a gaming application, when a user says "pick up a rock," this information must go back to the client application so that it can perform the operation and update the graphics. In this case, you want Amazon Lex to return the intent data to the client.



How the intent should be fulfilled, either by running a Lambda function or by returning the slot data to the client application.

Type: String

Valid Values: ReturnIntent | CodeHook

Required: Yes


A description of the Lambda function that is run to fulfill the intent.

Type: CodeHook object

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: