To access a rest API from angular, inside your controller for whatever portion of your app is accessing it, you'll need to use $http.get to access it.
app.controller("YourNameForController", ['$scope', '$location','$routeParams', '$http', function ($scope, $location, $routeParams, $http) {
$scope.mymodel = {};
$http.get("HTTP://LOCALHOST:3000/DETAILS").then(function (value) {
var data = value.data;
$scope.mymodel = data;
});
}]);