[Solved] How do you correctly add a global dependency to a FastAPI app instance? - Ans: Pass a list of Depends instances to the dependencies parameter in FastAPI() | FastAPI

FastAPI - Dependency Injection

How do you correctly add a global dependency to a FastAPI app instance?

APass a list of Depends instances to the dependencies parameter in FastAPI()

BAdd Depends instances to the middleware parameter in FastAPI()

CUse the @app.global_dependency decorator on the dependency function

DCall app.add_dependency() with the dependency function

Step-by-Step Solution

Solution:

Step 1: Recall FastAPI app parameters
FastAPI accepts a dependencies parameter that takes a list of Depends instances to apply globally.
Step 2: Eliminate incorrect options
There is no middleware parameter for dependencies, no @app.global_dependency decorator, and no add_dependency() method.
Final Answer:
Pass a list of Depends instances to the dependencies parameter in FastAPI() -> Option A
Quick Check:
dependencies parameter expects list of Depends [OK]

Quick Trick: Use dependencies=[Depends(...)] in FastAPI() constructor [OK]

Common Mistakes:

MISTAKES

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