Web Reference: Dec 30, 2023 · Understanding the Error The Mongoose duplicate key error occurs when you perform an upsert operation, which updates a document if it exists or creates a new one if it does not. This causes a conflict with unique indexes defined in your... May 18, 2016 · An upsert that results in a document insert is not a fully atomic operation. Think of the upsert as performing the following discrete steps: Query for the identified document to upsert. If the document exists, atomically update the existing document. Nov 25, 2025 · This blog dives deep into bulk upserts with Mongoose, focusing on custom `_id` fields. We’ll explore why duplicate key errors occur, how to structure bulk operations to avoid them, and walk through a step-by-step example to ensure smooth execution.
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