Web Reference: Could anybody please tell me how to handle DuplicateKeyError in MongoDB? I am writing a python script, where I move several docs from two different collections into a third one. Use the cause property to determine whether a definite or indefinite error caused this error, and only rely on the accuracy of the encrypted_fields if the error is definite. 4 days ago · Summary Duplicate key errors in MongoDB have error code 11000 and occur when a document violates a unique index. In Node.js, check err.code === 11000 and use err.keyValue to identify the conflicting field. In Python, catch DuplicateKeyError from pymongo.errors.
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