What is the difference between a normal and a static method in this case?

Question

Node.js

There are two files, one contains a class with cart methods:

class Cart {
    fetch() {}
}

In another routing:

const Cart = require('../models/cart')

router.get('/', async (req, res) => {
    const cart = await Cart.fetch()
})

Please help me figure out why the error Cart.fetch is not a function occurs, even though if you make the fetch method static, this error does not occur.

Answer 1

Normal methods are defined only on the class instance, they are not on the class itself. To call such a method, the class must be instantiated.

const cart = new Cart()
await cart.fetch()

Static methods are defined only in the class, they are not in the instance. You don't need to instantiate the class to access these methods.
await Cart.fetch()