Connecting dynamo db table with custom Alexa skill

This is a snippet of code I wrote to retrieve a value from one of DynamoDB tables and then update the record:

const AWS = require("aws-sdk");
const AWSregion = "us-east-1";
AWS.config.update({ region: AWSregion });

const DYNAMODB_TABLE_NAME = "My Dynamo Table";
const DynamoDB = new AWS.DynamoDB();

const id = "My Id";

let params = {
    Key: {
        "id": {
            S: id
        }
    },
    TableName: DYNAMODB_TABLE_NAME
};

DynamoDB.getItem(params, (err, data) => {
    if (err) {
        console.log(err, err.stack); // an error occurred
    }
    else {
        // I have a value in a field called "update". The retrieved data is in
        // data.Item.update.S

        const oldValue = data.Item.update.S;
        
        // Update the value in "update" for "id":
        const newValue = "New Data";
        params = {
            Item: {
                "id": {
                    S: id
                },
                "update": {
                    S: newValue
                }
            },
            TableName: DYNAMODB_TABLE_NAME
        };

        DynamoDB.putItem(params, (err, data) => {
            if (err) {
                console.log(err, err.stack); // an error occurred
            }
            else {
                // Update was successful
            }
        });
    }
});