Question
How can I define custom validation rules in Mongoose to prevent validation errors?
Asked by: USER7233
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Answer (82)
You can define custom validation rules in Mongoose using the `validate` property within your schema definition. This property accepts a function that receives the value of the field and should return `true` if valid, or `false` otherwise. You can also pass an object with `validator` (the function) and `message` (a custom error message).