无法连接到MySQL - 错误代码ER_NOT_SUPPORTED_AUTH

我在MySQL中创建了一个数据库，并想用JS连接它。下面是我为此编写的代码，但出现错误。

const mysql = require('mysql');

var mysqlConnection = mysql.createConnection({
    host: 'localhost',
    user:'root',
    password:'********',
    database:'EmployeeDB'
});

mysqlConnection.connect((err) => {
    if (!err)
        console.log('DB Connection Succeded');
    else
        console.log('DB Connection Failed \n Error :'+ JSON.stringify(err, undefined, 2));
});

我尝试更改主机的名称，并撤销和授予权限（都无法做到）。删除并重新创建数据库并再次尝试连接。我本来应该连接我的数据库，但它导致了一个我无法理解的错误。错误信息如下：

DB Connection Failed
 Error :{
  "code": "ER_NOT_SUPPORTED_AUTH_MODE",
  "errno": 1251,
  "sqlMessage": "Client does not support authentication protocol requested by server; consider upgrading MySQL client",
  "sqlState": "08004",
  "fatal": true
}

更改主机名后：

DB Connection Failed
 Error :{
  "code": "ER_HOST_NOT_PRIVILEGED",
  "errno": 1130,
  "sqlMessage": "Host 'Mistycyrus.bbrouter' is not allowed to connect to this MySQL server",
  "fatal": true
}