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Go Academy · Lesson

Why Structured Logs

Machine-readable logging.

Logs Machines Can Read

Traditional logs are free-form strings: "user 42 logged in from 1.2.3.4". They are easy for humans but painful for machines to query. Structured logging emits key-value pairs so log aggregators can filter and aggregate reliably.

The Problem With String Logs

Parsing free text is brittle:

  • Formats drift over time
  • Regexes break on edge cases
  • You cannot easily ask "all events where userID=42"

Structured logs make every field a first-class, queryable attribute.

All lessons in this course

  1. Why Structured Logs
  2. slog Handlers
  3. Log Levels and Attributes
  4. Custom Handlers
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