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In Express.js, where should the centralized error handling middleware be placed in the middleware stack?

easy📝 Conceptual Q2 of 15
Node.js - Error Handling Patterns
In Express.js, where should the centralized error handling middleware be placed in the middleware stack?
ABefore all route handlers
BAfter all route handlers and other middleware
CIn the middle of route handlers
DIt does not matter where it is placed
Step-by-Step Solution
Solution:

  1. Step 1: Recall Express middleware order

    Express executes middleware in the order they are added.

  2. Step 2: Place error handler after routes

    Error handling middleware must come after all routes to catch errors from them.

  3. Final Answer:

    After all route handlers and other middleware -> Option B

  4. Quick Check:

    Error middleware position = After routes [OK]
Quick Trick: Place error middleware last to catch all errors [OK]
Common Mistakes:
  • Placing error middleware before routes
  • Inserting it randomly in middleware stack
  • Assuming order does not affect error catching

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