Serverless AWS Lambda Development · Lesson

Structured Logging and Correlation IDs

Learn to produce searchable, structured JSON logs and to trace a request across multiple functions using correlation IDs.

Plain Logs Do Not Scale

Free-text log lines are hard to filter at scale. Structured logging writes each entry as JSON with consistent fields you can query.

A good log entry has a level, a message, and contextual fields like request id and user id.

{
  "level": "INFO",
  "message": "order placed",
  "orderId": 42,
  "requestId": "abc-123"
}