Answer
Idempotent APIs produce the same result regardless of repeated calls, crucial for retries and reliability.
Quick Answer
Idempotent APIs produce the same result whether called once or multiple times with the same input. Critical for retry logic — if a payment request times out and the client retries, you must not charge twice. Implement via idempotency keys (client sends a unique ID per operation; server deduplicates using it). PUT and DELETE are naturally idempotent; POST is not.
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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