Mongoose Schema & Model

Defining a schema

A Mongoose schema declares expected fields and types; model() turns it into a class you can use to query.

const { Schema, model } = require("mongoose");

const userSchema = new Schema({
  name: String,
  email: String,
  age: Number
});

const User = model("User", userSchema);

Creating & saving a document

Models give you familiar, promise-based methods like create() and .save().

const user = await User.create({
  name: "Ada Lovelace",
  email: "ada@example.com",
  age: 36
});

Structure on a schema-less DB

MongoDB itself doesn't enforce a schema — Mongoose adds that structure at the application layer, in your Node.js code.