Answer
Use atomic DB operations, distributed locks, mutexes, or job queues. Avoid shared mutable state in the event loop.
Quick Answer
Node.js is single-threaded so JS execution is sequential — no true data races within JS. Race conditions still occur across async operations: two requests read the same record simultaneously, both decide to update, the second overwrites the first. Fix with optimistic locking (check version before write), database-level transactions, or Redis SETNX for distributed locks.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ