index.html

<script type="text/javascript" src="/public/js/jquery-1.10.2.min.js"></script>
  <script type="text/javascript" src="/public/lib/angular/angular.js"></script>
  <script type="text/javascript" src="/public/lib/angular/angular-route.js"></script>
  <script type="text/javascript" src="/public/lib/angular/angular-resource.min.js"></script>
  <script type="text/javascript" src="/public/lib/angular/angular-cookies.min.js"></script>
  <script type="text/javascript" src="/public/js/app.js"></script>
  <script type="text/javascript" src="/public/js/services.js"></script>
  <script type="text/javascript" src="/public/js/controllers.js"></script>
  <script type="text/javascript" src="/public/js/controllers/signup.js"></script>
  <script type="text/javascript" src="/public/js/controllers/login.js"></script>
  <script type="text/javascript" src="/public/js/filters.js"></script>
  <script type="text/javascript" src="/public/js/directives.js"></script>
  <script type="text/javascript" src="/public/js/bootstrap.min.js"></script>

signupCtrl.js

 'use strict';

controllersModule.controller('SignupCtrl', ['$scope','$cookies','$http',
function($scope, $http,$cookies) {
	$scope.disableSignupBtn = false;
	
	$scope.name = "";
	$scope.username = "";
	$scope.email = "";
	$scope.password = "";
	$scope.passConf = "";

	$scope.signup = function() {
		$scope.disableSignupBtn = true;
		$scope.result = "";

		$scope.nameErrors = [];
		$scope.usernameErrors = [];
		$scope.emailErrors = [];
		$scope.passwordErrors = [];
		$scope.passConfErrors = [];

		// VALIDATION
		if (!signupForm.name.value) {
			$scope.disableSignupBtn = false;
			$scope.nameErrors.push("Enter your name");
		};

		if (!signupForm.username.value) {
			$scope.disableSignupBtn = false;
			$scope.usernameErrors.push("Enter your username");
		};

		if (!signupForm.email.value) {
			$scope.disableSignupBtn = false;
			$scope.emailErrors.push("Enter your email");
		};

		if (!signupForm.password.value) {
			$scope.disableSignupBtn = false;
			$scope.passwordErrors.push("Enter your password");
		};

		if (!signupForm.passConf.value) {
			$scope.disableSignupBtn = false;
			$scope.passConfErrors.push("Enter your password again");
		};

		if(signupForm.password.value.length < 6){
			$scope.disableSignupBtn = false;
        	$scope.passwordErrors.push("Password can't be less than 6 charachters");
      	};

      	if (signupForm.password.value != signupForm.passConf.value) {
      		$scope.disableSignupBtn = false;
      		$scope.passConfErrors.push("Passwords doesn't match");
      	};


      	// send signup request
      	if ($scope.disableSignupBtn) { // which means all validations are passed
      		var signupData = {
      			Name: signupForm.name.value,
      			Username: signupForm.username.value,
      			Email: signupForm.email.value,
      			Pass: signupForm.password.value
      		};


      		$http.post("/api/v0/signup", signupData).success(function(data, status, headers, config) {
      			$cookies.auth_token = data.Auth_token;
      			$scope.result = data;
      		}).error(function(data, status, headers, config) {
      			$scope.disableSignupBtn = false;
      			if (status === 400) {
      				// bad request
      				$scope.result = data;
      		};

      			if (status === 420) {
      				$scope.disableSignupBtn = false;

      				// show error to the user
      				$scope.nameErrors = data.Name;
      				$scope.usernameErrors = data.Username;
      				$scope.emailErrors = data.Email;
      				$scope.passwordErrors = data.Pass;
      			}
      		});
      	};
	}
}]);