SQL Server connection with Node js - node.js

Question

var express = require('express');
var app = express();
app.get('/', function (req, res) {
var sql = require("mssql");
// config for your database
var config = {
user: 'sa',
password: '1234',
server: 'AHMAD\SQLEXPRESS',
database: 'dbms_lab4',
port:1433,
encrypt:false
};
// connect to your database
sql.connect(config, function (err) {
if (err) console.log(err);
// create Request object
var request = new sql.Request();
// query to the database and get the records
request.query('select * from Products', function (err, recordset) {
if (err) console.log(err)
// send records as a response
res.send(recordset);
});
});
});
var server = app.listen(5000, function () {
console.log('Server is running..');
});
I can't connect to SQL Server. When I run the above program and access localhost:5000, nothing appears on the browser but a message on the terminal of vscode:
"The default value for `config.options.enableArithAbort` will change from `false` to `true` in the next major version of `tedious`. Set the value to `true` or `false` explicitly to silence this message. node_modules\mssql\lib\tedious\connection-pool.js:61:23
ConnectionError: Connection is closed.
at Request._query (D:\JS\Sql_Connection\node_modules\mssql\lib\base\request.js:447:37)
at Request._query (D:\JS\Sql_Connection\node_modules\mssql\lib\tedious\request.js:346:11)
at Request.query (D:\JS\Sql_Connection\node_modules\mssql\lib\base\request.js:383:12)
at Immediate.<anonymous> (D:\JS\Sql_Connection\server.js:27:17)
at processImmediate (internal/timers.js:458:21) {
code: 'ECONNCLOSED',
name: 'ConnectionError'
}
ConnectionError: Failed to connect to AHMADSQLEXPRESS:1433 - getaddrinfo ENOTFOUND AHMADSQLEXPRESS
at Connection.<anonymous> (D:\JS\Sql_Connection\node_modules\mssql\lib\tedious\connection-pool.js:68:17)
at Object.onceWrapper (events.js:428:26)
at Connection.emit (events.js:321:20)
at Connection.socketError (D:\JS\Sql_Connection\node_modules\mssql\node_modules\tedious\lib\connection.js:1290:12)
at D:\JS\Sql_Connection\node_modules\mssql\node_modules\tedious\lib\connection.js:1116:21
at GetAddrInfoReqWrap.callback (D:\JS\Sql_Connection\node_modules\mssql\node_modules\tedious\lib\connector.js:158:16)
at GetAddrInfoReqWrap.onlookupall [as oncomplete] (dns.js:76:17) {
code: 'ESOCKET',
originalError: ConnectionError: Failed to connect to AHMADSQLEXPRESS:1433 - getaddrinfo ENOTFOUND AHMADSQLEXPRESS
at ConnectionError (D:\JS\Sql_Connection\node_modules\mssql\node_modules\tedious\lib\errors.js:13:12)
at Connection.socketError (D:\JS\Sql_Connection\node_modules\mssql\node_modules\tedious\lib\connection.js:1290:56)
at D:\JS\Sql_Connection\node_modules\mssql\node_modules\tedious\lib\connection.js:1116:21
at GetAddrInfoReqWrap.callback (D:\JS\Sql_Connection\node_modules\mssql\node_modules\tedious\lib\connector.js:158:16)
at GetAddrInfoReqWrap.onlookupall [as oncomplete] (dns.js:76:17) {
message: 'Failed to connect to AHMADSQLEXPRESS:1433 - getaddrinfo ENOTFOUND AHMADSQLEXPRESS',
code: 'ESOCKET'
},
name: 'ConnectionError'
}
ConnectionError: Connection is closed.
at Request._query (D:\JS\Sql_Connection\node_modules\mssql\lib\base\request.js:447:37)
at Request._query (D:\JS\Sql_Connection\node_modules\mssql\lib\tedious\request.js:346:11)
at Request.query (D:\JS\Sql_Connection\node_modules\mssql\lib\base\request.js:383:12)
at D:\JS\Sql_Connection\server.js:27:17
at D:\JS\Sql_Connection\node_modules\mssql\lib\base\connection-pool.js:241:7
at processTicksAndRejections (internal/process/task_queues.js:97:5) {
code: 'ECONNCLOSED',
name: 'ConnectionError'
}"

Answer 1

For SQL Connections: "Microsoft style strings of hostname\instancename are not supported."
EG from : https://www.w3schools.com/nodejs/nodejs_mysql.asp
var mysql = require('mysql');
var con = mysql.createConnection({
host: "localhost",
user: "yourusername",
password: "yourpassword"
});
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
});
You need to update your config accordingly.

Answer 2

try escaping the \ in the server name
Change
server: 'AHMAD\SQLEXPRESS'
To
server: 'AHMAD\\SQLEXPRESS',