Node.js · Senior · Question 3 of 75

Which pattern is a classic cause of a memory leak in a Node.js server?

1A local variable inside a request handler
✓Correct answer: A module-level Map used as a cache that is filled on every request and never evicted
3Using const instead of let

Explanation

Anything reachable from a module-level object lives forever. Use a bounded LRU cache with TTL, a WeakMap keyed by objects, or an external cache like Redis.

Which pattern is a classic cause of a memory leak in a Node.js server?

Explanation

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