Web Reference: Jun 26, 2014 · If there is more than one document without a value for the indexed field or is missing the indexed field, the index build will fail with a duplicate key error. You can combine the unique constraint with the sparse index to filter these null values from the unique index and avoid the error. Dec 30, 2023 · These solutions should give you a comprehensive approach to avoid the Mongoose E11000 error by ensuring there is no duplication in unique fields, improving schema designs, handling exceptions properly, and migrating pre-existing data if necessary. Nov 22, 2025 · In this guide, we’ll break down what causes the E11000 error, how to diagnose it using a practical User Schema example, and step-by-step solutions to fix it. We’ll also cover best practices to avoid it in the future.
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