👀 Views: 0 💬 Answers: 1 📅 Created: 2025-08-20

aws appsync dynamodb graphql JavaScript

I'm working on a project and hit a roadblock. Hey everyone, I'm running into an issue that's driving me crazy. I'm currently working with AWS AppSync and trying to set up a GraphQL API that pulls data from a DynamoDB table. However, I'm working with an scenario where the resolver seems to be returning `null` even though there are items in the table. I suspect that the mapping template might be incorrectly configured. Here’s what I have so far: The GraphQL schema is defined as follows: ```graphql type Item { id: ID! name: String! description: String } type Query { getItem(id: ID!): Item } ``` My DynamoDB table is named `ItemsTable` with the partition key set to `id` of type `String`. For the resolver associated with the `getItem` query, I have the following mapping template: **Request Mapping Template:** ```vtl { "version": "2017-02-28", "operation": "GetItem", "key": { "id": $util.dynamodb.toDynamoDB($ctx.args.id) } } ``` **Response Mapping Template:** ```vtl $util.toJson($ctx.result) ``` I am getting the following behavior in the AppSync console when I try to query an item that I know exists: ``` { "data": { "getItem": null } } ``` I've verified the permissions of the AppSync role in IAM, ensuring it has the necessary access to read from `ItemsTable`. Additionally, I checked the DynamoDB table directly using the AWS console, and I can see the items there. To troubleshoot, I tried outputting `$ctx.args` in the response mapping template, and it returns the expected ID, so it seems like the request is being formed correctly. Does anyone have advice on what I might be missing or where to look next? I’m using AWS AppSync with the JavaScript SDK version 2.8.0. I'd really appreciate any guidance on this. The project is a mobile app built with Javascript. How would you solve this? I'm working with Javascript in a Docker container on Windows 10. Any examples would be super helpful.