When your backend sends responses that don’t follow a consistent structure, Swift’s Decodable system can begin to reveal its limitations. It expects structure. Predictability. Stability. However, real-world APIs — especially those powering social feeds, content backends, or any CMS-driven application — rarely fit that mold.
This article takes a look under the hood of Swift’s decoding system. The goal isn’t to memorize recipes, but to understand what’s really happening so you can build decoding logic that scales with the unpredictable nature of your APIs.