https://nalar.dev/tags/environment-variables/ Recent content in Environment Variables on Nalar Hugo en-us Tue, 01 Sep 2026 00:00:00 +0700 https://nalar.dev/configuration-from-environment-go/ Tue, 01 Sep 2026 00:00:00 +0700 https://nalar.dev/configuration-from-environment-go/ <p>Environment variables are a convenient way to configure deployed Go services, but calling <code>os.Getenv</code> throughout an application makes configuration difficult to validate and test.</p> <p>A stronger pattern is to load configuration once at startup, parse it into typed fields, validate all invariants, and pass the resulting value to the components that need it.</p> <p>The examples below use only the Go standard library and work with modern supported Go releases.</p> <h2 id="keep-configuration-in-a-typed-struct">Keep configuration in a typed struct</h2> <p>Suppose a service needs a listen address, request timeout, and optional log level:</p>