Strategies to test AWS AppSync VTL templates

1

AWS Lambda

The AWS AppSync enables you to integrate with other AWS services via AWS Lambda functions or VTL mapping templates. Historically it was pretty hard to test the logic written in the VTL templates. As the service matured, AWS added more and more ways to do so, enabling us, developers, to ensure the service we are developing is working correctly.

#Cloud Computing #Cloud Hosting #Backend As A Service 244 social mentions

2

DynamoDB

The test boils down to evaluating the VTL template via the AWS SDK, then asserting on the result. You have only one dependency to maintain – the AWS SDK for AppSync, which is a huge win. The following is a snippet that evaluates a VTL template via the AppSync SDK responsible for fetching a user from AWS DynamoDB.

#Databases #NoSQL Databases #Relational Databases 101 social mentions

3

AWS AppSync

AWS AppSync is a serverless GraphQL and Pub/Sub API service that many developers love. Turing the complex job of creating and managing a GraphQL API with real-time capabilities into a few lines of IaC (or clicks in the console) is a great win for AWS serverless developers.

#Project Management #Workflow Automation #Web Service Automation 30 social mentions

4

AWS Mobile Services

This is the technique I've used before I learned about the AppSync SDK's ability to render templates. Instead of relying on the SDK, we use libraries the AWS Amplify uses internally to render the template.

#Developer Tools #Realtime Backend / API #App Development 77 social mentions