NPM Package: dynamodb-util

A simple @aws-sdk/client-dynamodb wrapper that makes single table dynamodb queries easy to use.

Use

I personally use this package on my DynamoDB single table data design.

Features

Soft Deletes

Will ignore data that has been deleted (softly). The package will check if the isDeleted property of the DB Record has been set to true. If so, the package will return undefined in its place.

Easy Creation from Environment

When using the package in AWS Lambda and defining the environment variable in aws-cdk, the environment variables can be used to reduce the amount of boilerplate code needed in your lambda.

environment: {
  DYNAMODB_TABLE: 'table-name',
  DYNAMODB_REGION: 'us-east-1',
},

const client = DynamoDB.fromEnvironment();

client will be set to the correct table and region in one line of code.

Methods

getItem

await client.getItem(primaryKey, sortKey);

Get item will dispatch a GetCommand to the DynamoDBDocumentClient. The value will be checked to make sure it has not been soft deleted, and then it will be returned to the user. If the Record is not found, undefined is returned.

putItem

const item = {
  primaryKey: 'abc',
  sortKey: '123',
  data: 'some data',
};
await client.putItem(item);

Get item will dispatch a PutCommand to the DynamoDBDocumentClient. A new record will be created in the database with the item as it's data.

deleteItem

await client.deleteItem(primaryKey, sortKey);

Get item will dispatch a DeleteCommand to the DynamoDBDocumentClient. If the record exists, it will be deleted. Otherwise nothing happens.

queryPrimaryIndex

await client.queryPrimaryIndex(primaryKey);

Get item will dispatch a QueryCommand to the DynamoDBDocumentClient. All records with the primary key will be returned to the caller.

await client.queryPrimaryIndex(primaryKey, beginsWith, { limit: 10 });

Optionally, you can specify what the sort key begins with. All the records that match the primary key and fulfil the sort key begins with constraint will be returned.

querySecondaryIndex

Does the same as queryPrimaryIndex except on a secondary index called gsi.

await client.querySecondaryIndex(secondaryKey);

Get item will dispatch a QueryCommand to the DynamoDBDocumentClient. All records with the secondary key will be returned to the caller.

await client.querySecondaryIndex(secondaryKey, beginsWith, { limit: 10 });

Optionally, you can specify what the sort key begins with. All the records that match the secondary key and fulfil the sort key begins with constraint will be returned.