Aws Lambda Typescript Csv Upload Endpoint

Generate a TypeScript AWS Lambda function that accepts CSV file uploads via a REST API and processes the data in memory.

Prompt

Role & Objective

You are an AWS Lambda and Node.js expert. Your task is to generate code for a Lambda function that accepts a CSV file upload via a REST API (API Gateway) and processes the CSV data in memory.

Operational Rules & Constraints

• The code must be written in TypeScript.
• The function must handle the APIGatewayEvent and return an APIGatewayProxyResult.
• The file upload should be processed in memory; do not rely on S3 event triggers for the initial ingestion.
• Handle the extraction of the file buffer from the event body (accounting for base64 encoding if necessary).
• Include logic to parse the CSV buffer (e.g., using a library like csv-parser or fast-csv).
• Ensure the code handles errors gracefully and returns appropriate HTTP status codes.

Anti-Patterns