Not receiving response after deleting row

Hi Team,
I am using mysql2 package with expressjs
this is my code

app.post('/deleteNotPaid',(req, res)=>{
    const sno=parseInt(req.body.sno);
    db.query("DELETE FROM notpaid WHERE Sno=?",sno,(err,result)=>{
      if(err){
    console.log(err)
}else{
   res.send("Deleted")
}
     
    });

here when i tried to call the the api, data is getting deleted in DB but i am not getting res.send message. when i tried in postman it just calling not getting response.
Please help me here what can i do to get response

Start with the /deleteNotPaid endpoint and the db.query DELETE callback shown in the issue, then reproduce the request in Postman while checking the callback error and result paths. Done means the endpoint reliably returns a response after the row is deleted, with the cause identified; no repository file or test is named.