.env setup to hide key

I’m fairly new to javascript and wanted to hide my API key. Can’t seem to get dotenv to work. I’ve followed the steps on the dotemv documentation but no luck. First i ran “npm install dotenv –save” which added the following files/folders into my project

  • Node_modules folder
  • package-lock.json
  • package.json

app.js

import "dotenv/config"; 
import express from "express";
require("dotenv").config();

console.log(process.env.API_KEY);
const API = API_KEY;

.env

API_KEY = "123"

Uncaught TypeError: Failed to resolve module specifier “dotenv/config”. Relative references must start with either “/”, “./”, or “../”.

I tried adding the “/” and “./” but the same error. it’s in the same location.