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Mongoose Fundamentals

In our original poetry application example we declared the schema type for our title as a String:

const poemSchema = new mongoose.Schema({ title: String })

Often, we want to specify more than just the type of a path — we can use validators to ensure other aspects of a document’s input value.


Data validation is intended to provide guarantees about user input. Mongoose has several built-in validators.

You can add required validators to our Schema in an object that you pass to the path:

const poemSchema = new mongoose.Schema({ title: { type: String, required: true }, body: { type: [String], required: true }, published: { type: Boolean, required: true }, })

In the example above, we set the schema type and required attributes for the title, body, and published paths. If the required property is true, then it is a required field when you save to the database.

If you save a document with an invalid path value, you will receive this error message Path `title` is required.. You can define a custom error message like this:

const poemSchema = new mongoose.Schema({ title: { type: String, required: 'Title is required!' } })

You can learn more about mongoose validators in their documentation.



Refactor your schema to use the object syntax, and add a required validator with a value of true to each of the paths.

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