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Product engineering

When a web application needs an API

Questions that clarify whether an API boundary adds useful reuse and control or only introduces avoidable complexity.

Editorial team · August 13, 2026

An API is valuable when multiple trusted clients need the same operations, an integration requires a stable contract, or business rules need a clear application boundary.

A simple server-rendered application can still separate domain logic cleanly without exposing a broad external interface.

Define authentication, authorization, validation, rate limits, versioning, and error behaviour before treating an endpoint as a reusable product surface.