javascript - Custom Validator in express -


i'm trying build custom validator here checking if username exists or not. @ time of form submission i'm getting username exist message when there no data in db. 

app.use(validator({    errorformatter: function(param, msg, value) {       var namespace = param.split('.')     , root    = namespace.shift()     , formparam = root;      while(namespace.length) {        formparam += '[' + namespace.shift() + ']';     }     return {     param : formparam,     msg   : msg,     value : value    }; }, customvalidators: {    isusername: function(value) {       return new promise((resolve,reject) => {          user.findone({'username': username}, function(err, results) {               if (err) throw err;             if(user == null) {                resolve();             } else {                reject();             }           });         });       }    }  }));

middleware

req.check('username','username exist').isusername();  req.asyncvalidationerrors().then(() => {     console.log("no error");     next();  }).catch((errors) => {     console.log("errors");         if(errors){             res.send(errors[0]);         }  });


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