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The code in this article is sourced from this GitHub repository.
This article is not about AWS AppSync itself. If you are not familiar with the service, this GitHub repository contains a lot of AWS AppSync specific resources that you can consume.
The user makes a request to an API frontend with Amazon API Gateway backed by a mock integration. The AWS Lambda authorizer handles authorization. The role of the mapping template is to respond with some of the Amazon API Gateway mapping template variables, mainly the ones related to authorization.
Like Amazon API Gateway, the AWS AppSync service enables developers to write VTL mapping templates to transform data. Will AWS AppSync VTL parsing logic behave differently from the one we observed in Amazon API Gateway? Let us find out.