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You want to secure multiple endpoints in FastAPI using the same API key header. Which approach is best to avoid repeating code?

hard🚀 Application Q15 of 15
FastAPI - Authentication and Security
You want to secure multiple endpoints in FastAPI using the same API key header. Which approach is best to avoid repeating code?
AUse a global variable to store the API key and check it manually in each endpoint
BCopy the API key check code inside every endpoint function
CCreate a reusable dependency function that checks the API key and use Security() with it
DDisable authentication and rely on client honesty
Step-by-Step Solution
Solution:

  1. Step 1: Understand code reuse in FastAPI dependencies

    FastAPI encourages reusable dependencies to share logic like API key checks.

  2. Step 2: Identify best practice for API key checks

    Creating a dependency function with Security() allows clean reuse across endpoints.

  3. Final Answer:

    Create a reusable dependency function that checks the API key and use Security() with it -> Option C

  4. Quick Check:

    Reusable dependency = clean, DRY code [OK]
Quick Trick: Use reusable dependency functions for API key checks [OK]
Common Mistakes:
MISTAKES
  • Copy-pasting code leads to duplication
  • Using global variables breaks encapsulation
  • Disabling authentication is insecure

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