aws lambda dynamodb nodejs scan

1export const scanTable = async (tableName) => {
2    const params = {
3        TableName: tableName,
4    };
5
6    let scanResults = [];
7    let items;
8    do{
9        items =  await documentClient.scan(params).promise();
10        items.Items.forEach((item) => scanResults.push(item));
11        params.ExclusiveStartKey  = items.LastEvaluatedKey;
12    }while(typeof items.LastEvaluatedKey != "undefined");
13
14    return scanResults;
15
16};

1var docClient = new AWS.DynamoDB.DocumentClient();
2
3var params = {
4    TableName: "users",
5    FilterExpression: "#user_status = :user_status_val",
6    ExpressionAttributeNames: {
7        "#user_status": "user_status",
8    },
9    ExpressionAttributeValues: { ":user_status_val": 'somestatus' }
10
11};
12
13docClient.scan(params, onScan);
14var count = 0;
15
16function onScan(err, data) {
17    if (err) {
18        console.error("Unable to scan the table. Error JSON:", JSON.stringify(err, null, 2));
19    } else {        
20        console.log("Scan succeeded.");
21        data.Items.forEach(function(itemdata) {
22           console.log("Item :", ++count,JSON.stringify(itemdata));
23        });
24
25        // continue scanning if we have more items
26        if (typeof data.LastEvaluatedKey != "undefined") {
27            console.log("Scanning for more...");
28            params.ExclusiveStartKey = data.LastEvaluatedKey;
29            docClient.scan(params, onScan);
30        }
31    }
32}