Web Reference: If one of your dependencies is declared multiple times for the same path operation, for example, multiple dependencies have a common sub-dependency, FastAPI will know to call that sub-dependency only once per request. Learn dependencies - sub-dependencies in FastAPI. Learn how to create dependencies that have sub-dependencies for arbitrarily deep dependency graphs. Nov 14, 2025 · FastAPI's dependency injection system helps you manage shared logic and resources efficiently while adhering to DRY principles. However, knowing when to inject a dependency versus when to skip it is a skill that comes with practice.
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