How do I validate data in Mongoose?

How do I validate data in Mongoose?

In Mongoose, you can validate data by defining validation rules in your schema. For example, you can use the 'required' property to ensure a field is not empty.

Can you show me an example of a Mongoose schema with validation?

Sure! Here's a simple example:

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  name: { type: String, required: true },
  email: { type: String, required: true, unique: true },
  age: { type: Number, min: 0 }
});

const User = mongoose.model('User', userSchema);

What happens if validation fails?

If validation fails, Mongoose will throw a validation error, and the document will not be saved to the database. You can catch this error in your code.

How can I customize validation messages?

You can customize validation messages by using the 'validate' property in your schema. For example:

email: { type: String, required: [true, 'Email is required!'] }