Lambda Powertools TypeScript adds structured logs, custom metrics and traces

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Lambda Powertools for TypeScript is an open source AWS toolkit that removes the need to write repetitive observability helpers in every function. The article walks through a small fictional bike rental API built with the Serverless Framework and tested locally with Vitest. It uses three packages, Logger, Metrics and Tracer, plugged into handlers through the Middy middleware engine. The author notes that consistent JSON logs with correlation IDs and custom CloudWatch metrics are the main benefits, while high-cardinality metric dimensions can drive up costs. The guide covers setup, correlation IDs, choosing between dimensions, metadata and X-Ray annotations, and the impact on cold starts and billing.

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