AWS SDK for JavaScript/Node.js in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the AWS SDK for JavaScript/Node.js used for?

It is a set of tools that helps your JavaScript or Node.js app talk to AWS services like DynamoDB, S3, and more, so you can store data, upload files, and manage cloud resources easily.

beginner

How do you create a DynamoDB client using AWS SDK for JavaScript v3?

You import DynamoDBClient from '@aws-sdk/client-dynamodb' and create a new instance with configuration like region. Example: 
const { DynamoDBClient } = require('@aws-sdk/client-dynamodb');
const client = new DynamoDBClient({ region: 'us-east-1' });

beginner

What is the purpose of the 'PutItemCommand' in AWS SDK for JavaScript/Node.js?

PutItemCommand is used to add a new item or replace an existing item in a DynamoDB table. It sends the data you want to store to DynamoDB.

beginner

Why should you handle errors when calling AWS SDK methods?

Because network issues, permission problems, or wrong data can cause requests to fail. Handling errors helps your app respond gracefully and avoid crashes.

beginner

What does 'await' do when calling AWS SDK commands in Node.js?

'await' pauses your code until the AWS service responds, so you get the result directly without using complicated callbacks. It makes your code easier to read and write.

Which AWS SDK package do you import to use DynamoDB client in JavaScript v3?

A dynamodb-sdk

B aws-sdk

C @aws-sdk/dynamodb-client

D @aws-sdk/client-dynamodb

The correct package for DynamoDB client in AWS SDK for JavaScript v3 is '@aws-sdk/client-dynamodb'.

What does the 'PutItemCommand' do in DynamoDB?

A Adds or replaces an item

B Updates an attribute only

C Reads an item

D Deletes an item

PutItemCommand adds a new item or replaces an existing item in a DynamoDB table.

Why is it important to handle errors when using AWS SDK calls?

A To increase AWS costs

B To speed up the request

C To avoid app crashes and handle failures gracefully

D To ignore network issues

Handling errors helps your app avoid crashes and respond properly to problems like network failures or permission errors.

What does 'await' do in an async function when calling AWS SDK commands?

A Waits for the command to finish and returns the result

B Stops the program permanently

C Runs the command in the background

D Skips the command

'await' pauses the function until the AWS SDK command finishes and returns the result.

Which region format is correct when configuring DynamoDBClient?

A USEast1

B us-east-1

C us_east_1

D east-us-1

AWS regions use lowercase letters and hyphens, like 'us-east-1'.

Explain how to set up and use the AWS SDK for JavaScript/Node.js to put an item into a DynamoDB table.

Think about the steps from importing to sending the command and handling the response.

Describe why asynchronous programming with 'async/await' is helpful when working with AWS SDK in Node.js.

Consider how async/await changes the flow of code execution.