Node js with mysql rest api GETTING Error: getaddrinfo ENOENT localhost - mysql

Question

Node js with mysql rest api GETTING Error: getaddrinfo ENOENT localhost::
In mysql phpmyadmin i have creates database named job_portal with same username and password.
webapp.js :
const express = require("express");
const app = express();
const cors = express("cors");
const dotenv = require("dotenv");
dotenv.config();
const dbService = require("./config/database");
const { response } = require("express");
//app.use(cors());
app.use(express.json());
//app.use(express.urlencoded({ extended : false }));
app.listen(process.env.app_port, () => {
//console.log("server running....", process.env);
console.log("server running on port....", process.env.app_port);
});
database.js :
const mysql = require("mysql");
const dotenv = require("dotenv");
dotenv.config();
//const { response } = require("express");
//let instance = null;
const connection = mysql.createConnection({
host : process.env.host,
user : process.env.user,
password : process.env.password,
database : process.env.database
});
console.log("process.env.db_port", process.env.user)
connection.connect((err) => {
if(err){
console.log(err);
}
console.log('db:: '+connection.state);
});
.env :
node_env = development
app_port = 5000
db_port = 3306
host = localhost
user = job_portal
password = job_portal
database = job_portal
connectionLimit = 10
Now facing error log:
process.env.db_port job_portal
server running on port.... 5000
Error: getaddrinfo ENOENT localhost
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:66:26)
--------------------
at Protocol._enqueue (C:\xampp\htdocs\projects\job portal in jquery\webservices\node_modules\mysql\lib\protocol\Protocol.js:144:48)
at Protocol.handshake (C:\xampp\htdocs\projects\job portal in jquery\webservices\node_modules\mysql\lib\protocol\Protocol.js:51:23)
at Connection.connect (C:\xampp\htdocs\projects\job portal in jquery\webservices\node_modules\mysql\lib\Connection.js:116:18)
at Object.<anonymous> (C:\xampp\htdocs\projects\job portal in jquery\webservices\config\database.js:14:12)
at Module._compile (internal/modules/cjs/loader.js:1138:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
at Module.load (internal/modules/cjs/loader.js:986:32)
at Function.Module._load (internal/modules/cjs/loader.js:879:14)
at Module.require (internal/modules/cjs/loader.js:1026:19)
at require (internal/modules/cjs/helpers.js:72:18) {
errno: 'ENOENT',
code: 'ENOENT',
syscall: 'getaddrinfo',
hostname: 'localhost',
fatal: true
}
db:: disconnected
how should i fix this issue please help me to resolve