I have declared variable globally at top of the variable and I am trying to access it inside the other call to do check whether user_id exist or what?. My function is working properly, but it's failing to validate. Please let me know where I am going wrong.
Global Method :
function isUserExist(user_id,callback) {
db.query('select id from user where id = ?' , [user_id],function(error, rows) {
    console.log("i ------>" + user_id); 
if(rows.length >0) {
return true;
}else {
    return false;
}
}); 
} 
inside another method :
router.post('/addcustomerasset', function(req,res) {
    if (create(user_id) ){
        console.log("User exists");
              // Code will execute
    }   
    else{
    response.success = false,
    response.mssg = "User Doesn't Exist";
    res.json(response);
    }
});
 
    