With SimpleEndpoints, you can turn your app engine project into Parse-like service. It automatically creates CRUD endpoints for all entities without any coding. You can now focus on building enpoints that has business logic.
You can pull this repo as eclipse project and deploy it as one of the versions of your app engine project. Once deployed, you will have access to the following endpoints:
List of all entities of a kind - GET https://endpoints.myproject.appspot.com/entity/kind
Read of an entity for the list - GET https://endpoints.myproject.appspot.com/entity/kind/id
Update of an entity - PUT https://endpoints.myproject.appspot.com/entity/kind/id
Create of an entity - POST https://endpoints.myproject.appspot.com/entity/kind/id
Delete of an entity - DELETE https://endpoints.myproject.appspot.com/entity/kind/id