DynamoDB docClient scan does not respond

Question

I use DynamoDB with nodeJS on a Lambda function using serverless. When I scan item from my local computer it works but when I deploy my function scan does not respond. No errors

const docClient = new AWS.DynamoDB.DocumentClient({
  apiVersion: "2012-08-10",
});

const checkApiKey = async (apiKey, ) => {
  try {
    log.debug("before scan");
    let result = await docClient
      .scan({
        "MY_TABLE",
        FilterExpression: "#apiKey = :apiKey",
        ExpressionAttributeNames: {
          "#apiKey": "apiKey",
        },
        ExpressionAttributeValues: { ":apiKey": apiKey },
      })
      .promise();
     log.debug("after scan");
  } catch (error) {
    log.error("Can not get dynamo object", { message: error.message });
    throwError(error);
  }
};

When I call this function on AWS, I can see in my log before scan but I don't see after scan nor error message from catch.

DynamoDB operations like "create" works fine.

I have been looking for a solution for several days ... Without success

Answer 1

I'm not sure if it's causing your problem, but the first thing that stuck out to me is how you are defining the table name in the call to scan:

 .scan({
        "MY_TABLE",
        ...

According to the docs, that should be a key/value pair

 .scan({
        TableName: "MY_TABLE",
        ...

If you are using the Serverless Framework, do you get different results if you run the function local vs remote?

For example, running the function locally from the command line:

sls invoke local --function <FUNCATION NAME from serverless.yml>

vs running the function remotely (in AWS) from the command line

sls invoke --function <FUNCATION NAME from serverless.yml>

Answer 2

Please try to add the callbacks for the promise of await docClient.scan().promise()

I mean:

let result = await docClient
    .scan({
        TableName: "MY_TABLE",
        FilterExpression: "#apiKey = :apiKey",
        ExpressionAttributeNames: {
            "#apiKey": "apiKey",
        },
        ExpressionAttributeValues: { ":apiKey": apiKey },
    })
    .promise()
    .then(data => console.log)
    .catch(error => console.error)

and check the result, maybe then the picture became clear.