I have an ExpressJS server with Node, running with the MySQL npm package, and all works fine. However, when I leave the server running a long time (say, overnight), I always come back to it having crashed, stating PROTOCOL_PACKETS_OUT_OF_ORDER. (See below)

How can I fix this, if even at all, as this server is soon to be deployed to production and this will be impossible if it crashes every night.

    throw er; // Unhandled 'error' event

Error: Packets out of order. Got: 0 Expected: 17


I have the same problem but after I have changed from createConnection to createPool, it won’t crash already.

const mysql = require("mysql");
const con = mysql.createPool({
  connectionLimit: 5,
  host: "localhost",
  user: // your user,
  password: // your password,
  database: // your database,
  debug: false

con.on("connection", connection => {
  console.log("Database connected!");

  connection.on("error", err => {
        console.error(new Date(), "MySQL error", err.code);

    connection.on("close", err => {
        console.error(new Date(), "MySQL close", err);

module.exports = con;

Answered By – Titan XP

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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