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What is the main purpose of global middleware in a NestJS application?

easy📝 Conceptual Q11 of 15
NestJS - Middleware
What is the main purpose of global middleware in a NestJS application?
ATo define database models for the application
BTo run code on every incoming request before reaching route handlers
CTo create new routes dynamically
DTo handle errors after the response is sent
Step-by-Step Solution
Solution:

  1. Step 1: Understand middleware role

    Middleware runs before route handlers to process requests or add features like logging.

  2. Step 2: Identify global middleware scope

    Global middleware runs on every request, so it applies common logic everywhere.

  3. Final Answer:

    To run code on every incoming request before reaching route handlers -> Option B

  4. Quick Check:

    Global middleware = runs on every request [OK]
Quick Trick: Global middleware runs before routes on all requests [OK]
Common Mistakes:
  • Confusing middleware with route handlers
  • Thinking middleware only runs on some routes
  • Mixing middleware with error handling

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