Web Reference: All SchemaTypes have the built-in required validator. The required validator uses the SchemaType's checkRequired() function to determine if the value satisfies the required validator. Numbers have min and max validators. Strings have enum, match, minLength, and maxLength validators. Sep 22, 2025 · Mongoose validation is a middleware that runs before a document is saved to the database. It automatically validates data based on rules defined in the schema, ensuring that all fields meet the specified requirements. Jul 2, 2025 · A guide to Mongoose schema validation with built-in rules, custom validators, middleware hooks, and advanced patterns for robust data integrity.
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