If anyone's interested in doing the math about the costs involved, I have two quick notes: first, the API Gateway, at $3.50 per million requests, is typically m

If anyone's interested in doing the math about the costs involved, I have two quick notes: first, the API Gateway, at $3.50 per million requests, is typically more expensive than the Lambda functions themselves (and comes with no permanent free tier, unlike Lambda); second, the 128MB minimum memory for a Lambda function can be on the tight side for an Express app, so you might want to base your calculations on more memory.