Why use mongoose schema in Node.js

Question

I was learning Node.js and Mongoose. Then, I cam across the term schema which is defined as the description of the structure of the data, default values and validation. So, as we know schema looks basically like this:

var TaskSchema = new Schema({
    name: String,
    priority: Number
});

The question I would like to ask is Why should we care about the description of structure of data that the schema allows to achieve, I mean, what is the main point in the use of schemas in mongoose? if you say, validation, then can't we achieve that with express-validator package? or...

Answer 1

Everything in Mongoose starts with a Schema. Each schema maps to a MongoDB collection and defines the shape of the documents within that collection.

See the documentation for more information.

Schemas not only define the structure of your document and casting of properties, they also define document instance methods, static Model methods, compound indexes, and document lifecycle hooks called middleware.

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This is what allows you to communicate with the database easily using mongoose. It's not just for validation.