Creating a Mongoose Schema

In Mongoose, schemas define the structure of documents inside a MongoDB collection. A schema acts as a blueprint that describes which fields a document should contain, what data types they use, and whether certain fields are required.

Example:

const mongoose = require('mongoose');

// Create a schema for users
const userSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true
  },

  email: {
    type: String,
    required: true
  },

  age: {
    type: Number
  }
});

// Export the model
module.exports = mongoose.model('User', userSchema);

Understanding Schema Fields

In this schema:

• name is a required field and must contain a string;
• email is also required and uses the String type;
• age uses the Number type but is optional.

The type property defines the expected data type for a field. Common Mongoose types include:

• String;
• Number;
• Boolean;
• Date;
• Array.

The required property enables validation. If a required field is missing, Mongoose throws a validation error when trying to save the document.

Schemas help keep your application data organized and predictable, especially in larger projects where consistent document structure is important.