gimm285-api-project/server/model/connection.js

const mysql = require('mysql2/promise');
const credentials = require('./creds.json');

let connection = null;

async function query(sql, params) {
  console.log(params);
  if (null === connection) {
    console.log("Establishing connection to database!");
    connection = await mysql.createConnection(credentials);
  }

  const [results, ] = await connection.execute(sql, params);

  return results;
}

module.exports = {
  query
}