DynamoDB: Bulk Insert (Guide w/ Code Examples)

There are a few ways to bulk insert data into DynamoDB tables using the AWS JavaScript SDK. One way is to use the batchWrite method of the DynamoDB DocumentClient to write multiple items to a table in a single request.

Here's an example of how to use the batchWrite method to insert items into a DynamoDB table:

const AWS = require('aws-sdk');
const dynamoDb = new AWS.DynamoDB.DocumentClient();

const tableName = 'myTable';
const items = [
    { id: '123', name: 'John' },
    { id: '456', name: 'Jane' },
    { id: '789', name: 'Bob' },
    // ...
];

const requests = items.map((item) => {
    return { PutRequest: { Item: item } }
});

const chunks = chunkArray(requests, 25);

chunks.forEach((chunk) => {
    dynamoDb.batchWrite({ RequestItems: { [tableName]: chunk } }).promise()
        .then(data => {
            console.log("Items written successfully");
        })
        .catch(err => {
            console.error(err);
        });
});

function chunkArray(myArray, chunk_size){
    var results = [];
    while (myArray.length) {
        results.push(myArray.splice(0, chunk_size));
    }
    return results;
}