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. 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. Oct 18, 2025 · This article provides a definitive solution for the recurring MongoError: E11000 duplicate key error collection often encountered in MongoDB/Mongoose applications.
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