server.js

const mongoose = require("mongoose");

// Load environment variables from .env file if not in production
if (process.env.NODE_ENV !== "production") {
  require("dotenv").config();
}

// Set `strictQuery: false` to globally opt into filtering by properties that aren't in the schema
// Included because it removes preparatory warnings for Mongoose 7.
mongoose.set("strictQuery", false);

// Define the database URL to connect to.
const mongoDB = process.env.MONGODB_URI;

// Wait for database to connect, logging an error if there is a problem
main().catch((err) => console.log(err));
async function main() {
  await mongoose.connect(mongoDB);
  console.log(`connected to database`);
}

module.exports = mongoose.connection;