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Nishant Modak for Last9

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Logging in Golang

Practical insights into Golang logging, including how to use the log package, popular third-party libraries, and tips for structured logging.

Table of Contents

  • Introduction to Golang Logging
  • The Standard Library: log Package How I Learned to Stop Worrying and Love fmt.Println()
  • Popular Third-Party Logging Libraries Because Reinventing the wheel is so 2000s
  • Structured Logging in Go JSON: Its whats for dinner
  • Configuring Log Levels and Output Formats Choosing your adventure
  • Integrating with Observability Platforms Because logs are lonely without metrics and traces
  • Best Practices and Performance Considerations How to not shoot yourself in the foot
  • Real-World Examples I really have used this stuff myself
  • Conclusion Log everything; but log it right with a schema (Otel)

Golang logging guide for developers

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Top comments (3)

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Dan Jones •

Pretty surprised this article didn't mention slog, the stdlib structured logging package. It's a fairly recent addition, the 3rd party structured loggers all predate it, but it's built-in.

Personally, I'm a big fan of zerolog (which the article does mention). It's fast, and for me, fairly intuitive. And it feels a lot better using properly typed methods, rather than a method that just accepts interface{} for everything.

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Nishant Modak •

Added an updated section and included a comparison table. Hopefully makes it easier! Comparison of golang logging

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Nishant Modak •

Great point Dan! Completely missed mentioning it.

Let me include an update to article and cover slog.

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