Answer
A callback pattern where the first argument is the error and the second is the result.
Quick Answer
An error-first callback is Node.js's convention: the first parameter of the callback is always an error (null if no error, Error object if something went wrong). The second parameter is the result. Always check the error first: if (err) return handleError(err). This pattern predates Promises but is still common in many Node APIs.
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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