How to fetch/scan all items from `AWS dynamodb` using node.js

Question

How to fetch/scan all items from AWS dynamodb using node.js. I am posting my code here.

var docClient = new aws.DynamoDB.DocumentCl         


        

Answer 1

For those who are NOT USING AWS.DynamoDB.DocumentClient, this solution will work. I have split the functionality into multiple modules for easy readability and using async/await.

const AWS = require("aws-sdk");
AWS.config.update({
    // update table region here
    region: "us-west-2"
});
var dynamodb = new AWS.DynamoDB();
const performAsynScanOperation = (scanParams) => {
    return new Promise((resolve, reject) => {
        dynamodb.scan(scanParams, function (err, responseData) {
            if (err) {
                reject(err)
            } else {
                resolve(responseData)
            }
        })
    })
}

const getAllRecords = async (tableName) => {
    let allItems = [];
    let LastEvaluatedKeyFlag = true;
    let scanParams = { TableName: tableName }
    while (LastEvaluatedKeyFlag) {
        let responseData = await performAsynScanOperation(scanParams)
        let batchItems = responseData.Items;
        allItems = allItems.concat(batchItems);
        if (responseData.LastEvaluatedKey) {
            LastEvaluatedKeyFlag = true;
            console.log('LastEvaluatedKey', responseData.LastEvaluatedKey)
            scanParams.ExclusiveStartKey = responseData.LastEvaluatedKey
        } else {
            LastEvaluatedKeyFlag = false;
        }
    }
    return allItems;
}
getAllRecords('').then((allItems)=>{
  console.log(allItems)
})