Error in AngularJS-Bootstrap TypeAhead: TypeError: Cannot read property 'length' of undefined
after second look at code I've noticed what's wrong, you have to return $http promise here, notice return before $http
$scope.fetchUsers = function(val) { console.log("Entered fetchUsers function"); return $http.get("http://localhost:8080/TestWeb/users", { params : { username : val } }).then(function(res) { var users = []; angular.forEach(res.data, function(item) { users.push(item.UserName); }); return users; }); };