what is the best way to open and close connections when multiple inserts are made, through a stored procedure with tedious

        try {
  let conn = await Con.create();
            for (let i = 0; i < parameters.length; i++) {
                await conn.queryExec("PRO_insertValuesClients", parameters[i]);
            }
         
            conn.end();

the problem in this way that sometimes i get the error, I don't understand what is causing the error

Failed to connect to 10.78.56.21:1433 - connect EADDRINUSE 10.78.56.21:1433 


     

I wanted to try this way, but I don't know if it is the best or if there is another way, if you can advise me Thank you

 try {
            for (let i = 0; i < parameters.length; i++) {
let conn = await Con.create();
                await conn.queryExec("PRO_insertValuesClients", parameters[i]);
    conn.end();
            }