cra-socket/server/db/db.js

const Sequelize = require("sequelize");
const pkg = require("../../package.json");

const databaseName =
  pkg.name + (process.env.NODE_ENV === "test" ? "-test" : "");

const createDB = () => {
  const db = new Sequelize(
    process.env.DATABASE_URL || `postgres://localhost:5432/${databaseName}`,
    {
      logging: false
    }
  );
  return db;
};

const db = createDB();

module.exports = db;