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A small utility library to handle JSON encoded http responses easily, transforms the response into an internal type of data and extends the capabilities of Response, Iterable, List, Future<Response>, Future<Iterable>, Future<List> to handle data manipulation on the same future chain.

Getting Started

This package built upon the http package to work with it's internal Response type.

It's also possible to use some of the internal features without depending to http package, such as the extensions, Future<List<T>>, Future<Iterable<T>>, that helps to manipulate the data on the same future chain.


Here is a working example that shows the brief functionality of the library, this example highlights how to transform the JSON encoded HTTP body to an internal custom object and a list of that custom object on top of some data manipulation without leaving the same future chain that get's the data from the http call.

import 'package:http/http.dart' as http;
import 'package:asis/asis.dart';

class Task {
  final int userId;
  final int id;
  final String title;
  final bool completed;

  // Task({this.userId, this.id, this.title, this.completed});

  Task.fromJson(Map<String, dynamic> e)
      : userId = e['userId'],
        id = e['id'],
        title = e['title'],
        completed = e['completed'];

  /// Static method to pass the handler directly to the input.
  static Task handler(Map<String, dynamic> e) {
    return Task.fromJson(e);

/// Resource url.
var url = 'http://jsonplaceholder.typicode.com/todos';

/// Returns a task object.
Future<Task> task(int id) => http.get('$url/$id').as(Task.handler);

/// Returns a list of tasks.
Future<List<Task>> get tasks => http.get(url).asList(Task.handler);

void main() async {
  /// Get the third task and print the title.
      .then((e) => e.title)
      .then((e) => 'Title of the third task: $e')

  /// Print the title of the top 3 task.
  tasks.take(3).each((e) => print(e.title));

  /// Count of the completed tasks.
      .where((e) => e.completed)
      .fold(0, (p, _) => p + 1)
      .then((e) => 'Number of the completed tasks: $e')


Adds a couple of useful features to Iterable, List and Response, and extends the capabilities of the Future<Iterable>, Future<List> and Future<Response> to handle the data flow in the same Future chain.