DynamoDB Data Type Marshaller and Update Expression Builder

dynamodb-data-types is a JavaScript utility library designed to simplify the interaction with Amazon DynamoDB's native data type representations. It provides functions to convert standard JavaScript objects into DynamoDB's attribute value format (marshalling) and vice-versa (unmarshalling), handling complex nested structures and various primitive types. The library's current stable version is 4.0.1. Its release cadence is moderate, with major versions introducing significant features like the `UpdateExpression` builder in v4.0.0. A key differentiator is its focus on accurately handling DynamoDB's specific type mappings (e.g., numbers as strings `{N: '1'}`, sets, lists, maps, booleans, and nulls), alongside its ability to construct complex `UpdateExpression` payloads, including automatic handling of DynamoDB reserved keywords and proper `ExpressionAttributeValues` and `ExpressionAttributeNames` generation. This functionality reduces boilerplate code and common errors when performing update operations.