AWS Lambda is not always the ideal choice for your application. This can have numerous reasons e.g. your customers are annoyed from the cold startup times, you need a higher request body size or your application has very long running tasks which are interrupted.
To go around all of this issues we should have a long running application. Express.js is a popular choice for building Typescript and Javascript REST APIs. We can levarage it to transform our AWS lambda app to a long running Rest API.