How to access API Gateway request Model in Lambda function?

Question

I have a Lambda function mapped to API Gateway, where I have Models defined for the request input and response output.

But how to I access that model in the Lambda function (node) code?

http://docs.aws.amazon.com/apigateway/latest/developerguide/models-mappings.html

Answer 1

Unfortunately this is not natively supported in Lambda/API Gateway. You could certainly make a request to the API Gateway service to get the model information or simply hard code this information in the Lambda function.

Answer 2

OK turns out this is very easy! The model defined in API gateway is available right as the event parameter to the lambda handler method. This will write it to a log:

console.log(JSON.stringify(event, null, '  '));

And an individual field on that object can be accessed like:

console.log("Model property value: " + event.foo);