Web Reference: Jan 17, 2022 · It seems you don't have username as a part of your schema and you have created an index on it. Please make a change on schema or drop index on the username. The Error E11000 is thrown when there are unique fields (indexes) that you try to save while there is another one already in the Database. Dec 15, 2025 · Learn how to diagnose and fix the E11000 duplicate key error in MongoDB, including understanding unique indexes, handling race conditions, and implementing proper error handling strategies. Nov 22, 2025 · While frustrating, this error is actually a safeguard to ensure data integrity. 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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