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CODING-FUNDAMENTALS5 MIN READ

Move Config Out of Code

Decide how to externalize configuration without hiding secrets or creating drift.

Environment drift Staging sent checkout requests to production because a deploy-specific URL was committed as source code. The same artifact should move through environments; config should change around it. Config principle Code artifact stays stable; deploy config varies A value belongs outside code when it changes by deploy, customer, region, or secret rotation without requiring a source change. Hard-coded fast but sticky Less drift between staging and production External config is useful only when it is explicit, validated, and owned. 01 Classify 02 Externalize 03 Verify Step 1 You find a payment URL, a tax-rate formula, and an API secret…

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