Good APIs do not win on first impression. They survive change. This post looks at why stable APIs expose less, assume less, and age better over time.

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Good APIs are not defined by elegance at launch but by how well they hold up over time. The key insight is that most API problems stem from poor boundary decisions: exposing too much, embedding hidden assumptions, or mirroring transient UI shapes. Once consumers see something, they rely on it regardless of intent. The advice is to expose as little as possible, prefer boring and explicit over clever and convenient, avoid coupling APIs to current frontend structures, and understand that versioning doesn't compensate for fundamentally unstable design. Stable APIs reduce coordination costs and become trusted infrastructure rather than a source of ongoing friction.

Good APIs Age Slowly

# Most API Problems are Boundary Problems

Your API Is Not Your Frontend - Yes, I remember seeing some endpoint called something like “/landing-page-or-something”. Fortunately, these kinds of pages do not change frequently.

Very true… also take the time up front in the design to ensure that the core framework, including security, is rock solid before extending the system. If the core is clunky everything added will be clunky and adding security after the fact seldom covers everything.