LambdaLog: Structured JSON Logger for Node.js & AWS Lambda

LambdaLog is a lightweight and performant logging library for Node.js applications, primarily optimized for AWS Lambda environments. It specializes in generating structured JSON logs, making them easily parseable and searchable by services like CloudWatch Logs and other log aggregation platforms. The current stable version is 3.1.0, released in October 2021. While a 4.x beta series was active in late 2021 introducing ESM support and TypeScript improvements, development appears to have slowed since. Key differentiators include its seamless integration with Lambda execution contexts, automatic metadata enrichment, and a robust error logging mechanism, providing a production-ready alternative to `console.log` for serverless applications. It aims for minimal overhead and provides configurable logging levels and dynamic metadata capabilities.