Query Dynamo DB with multiple columns using AWS SDK V3 and Typescript

Question

I have the below piece of code that I try to use to fetch a row of data using values for 3 columns.

const client = new DynamoDB({region: "us-east-1"});
const params = {
TableName: Tables.TYPES,
ExpressionAttributeNames: {
    '#type': "type",
    '#region': "region",
    '#dock': "dock"
},
ExpressionAttributeValues: {
    ":type": type,
    ":dock": dock,
    ":region": region
 },
 KeyConditionExpression: '#type = :type AND #dock = :dock AND #region = :region'
 }
 let types: Record<string, NativeAttributeValue> = data = await client.send(new QueryCommand(params));
 console.log("Received data ", data);

However when I run the above code I get the following error.

"errorMessage": "Cannot read properties of undefined (reading '0')"

What am I doing wrong here? How can I read the row using values for multiple columns in my Dynamo DB table? I am using @aws-sdk/client-dynamodb by the way. Appreciate any help.

UPDATE: Still not working:

const params = {
            TableName: Tables. TYPES,
            FilterExpression: 'type = :type AND dock = :dock AND region = :region',
            ExpressionAttributeValues: {
                ":type": {S: type},
                ":dock": {S: dock},
                ":region": {s: region}
            }
        }

Answer 1

KeyConditionExpression is for keys only, your partition key and sort key. Outside of that, if you wish to filter on non key attributes you must use FilterExpression .

Assuming type is your Partition key, the params would look like this (edit further to suit your specific needs):

const params = {
TableName: Tables.TYPES,
ExpressionAttributeNames: {
    '#type': "type",
    '#region': "region",
    '#dock': "dock"
},
ExpressionAttributeValues: {
    ":type": type,
    ":dock": dock,
    ":region": region
 },
 KeyConditionExpression: "#type = :type",
 FilterExpression: "#dock = :dock AND #region = :region"
 }