Error: No event 'socketConnect' in state 'SentPrelogin' - node.js

Question

I am trying to connect my SQL Server database with node.js using knex but I am facing issue
Error: No event 'socketConnect' in state 'SentPrelogin'
at Connection.dispatchEvent (C:\Users\temp\Documents\PRactice\node_modules\tedious\lib\connection.js:1281:26)
at Connection.socketConnect (C:\Users\temp\Documents\PRactice\node_modules\tedious\lib\connection.js:1303:10)
at C:\Users\temp\Documents\PRactice\node_modules\tedious\lib\connection.js:1145:12
at Socket.onConnect (C:\Users\temp\Documents\PRactice\node_modules\tedious\lib\connector.js:106:7)
at Socket.emit (events.js:314:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1131:10)
Emitted 'error' event on Connection instance at:
at Connection.dispatchEvent (C:\Users\temp\Documents\PRactice\node_modules\tedious\lib\connection.js:1281:12)
at Connection.socketConnect (C:\Users\temp\Documents\PRactice\node_modules\tedious\lib\connection.js:1303:10)
[... lines matching original stack trace ...]
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1131:10)
[nodemon] app crashed - waiting for file changes before starting...
My code is
var knex = require('knex')({
client: 'mssql',
version:"7_1",
connection: {
user: 'sa',
password: 'Admin#123',
server: 'localhost',
database: 'Demo'
}
});
knex.select("*").from("Country")
.then(function (depts){
depts.forEach((dept)=>{ //use of Arrow Function
console.log({...dept});
});
}).catch(function(err) {
// All the error can be checked in this piece of code
console.log(err);
}).finally(function() {
// To close the connection pool
knex.destroy();
});

Answer 1

You need to add a missing dependency:
npm install --save tedious
As of knex v0.95.0 you'll need to use the tedious library instead of mssql when connecting to an MSSQL database. According to the knex upgrade instructions:
MSSQL driver was completely reworked in order to address the multitude of connection pool, error handling and performance issues. Since the new implementation uses tedious library directly instead of mssql, please replace mssql with tedious in your dependencies if you are using a MSSQL database.
Installing the package above should resolve your issue. I also had to set the encrypt option to false when connecting to my local database to avoid this error:
ConnectionError: Failed to connect to localhost:1433 - self signed certificate