How to display array of string from Json using FutureBuilder in Flutter

You remember when we explained Future API for async operation.

In my previous flutter code example, we had explored different ways to accomplish async operation in Flutter.

One of the limitations of Future API in some use cases is that the async method does not return a widget rather it returns a Future.

If you are expecting a widget from a method return but you got a Future object then it means you have to convert the Future object to a widget.

That is where FutureBuilder comes into play. It is a like bridge between a Future object and expected widget. You can read more about FutureBuilder in Flutter / Dart doc.

Let’s go ahead and show a simple flutter project that highlights how to display array of strings from Json using FutureBuilder in Flutter.

Create new Flutter Project

In your Visual Studio Code, go to View menu > Command Palette.

In the open dialog, select Flutter. Enter the name of your Flutter project and hit enter key button.

In the lib folder, open the main.dart file and add the code below.


import 'package:flutter/material.dart';
import 'json_array.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
      home: AsyncAwait(),

Add Dart Http Library

Since we are going to make a remote network call, we are going to use Http library.

But before we can import and use it in our project, we need to add the library to our project pubspec.yaml file.

pubspec.yaml file

name: food_store
description: A new Flutter project.

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# Read more about versioning at
version: 1.0.0+1

  sdk: ">=2.0.0-dev.68.0 <3.0.0"

    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2
  http: 0.12.0
  dio: 2.0.22
    sdk: flutter

# For information on the generic Dart part of this file, see the
# following page:

# The following section is specific to Flutter.
  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

    - assets/images/umbrella.png
    - assets/images/dnut.png
    - assets/star_anim.flr

    - family: AvenirNext
        - asset: assets/fonts/AvenirNextLTPro-Regular.otf

  # To add assets to your application, add an assets section, like this:
  # assets:
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg
  # An image asset can refer to one or more resolution-specific "variants", see
  # For details regarding adding assets from package dependencies, see
  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # For details regarding fonts from package dependencies,
  # see

Create new Dart file in lib folder

Go to the lib folder and create a dart file. Name the file json_array.dart.

Import the http package with dart async and convert packages into this class

Open the newly created dart file and add the code below.

import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;

import 'package:flutter/material.dart';

class FutureBuilderJson extends StatelessWidget {
  final String uri = '';

  Future<List<dynamic>> _fetchStrings() async {
    var response = await http.get(uri);

    if (response.statusCode == 200) {
      final items = json.decode(response.body).cast<Map<String, dynamic>>();
      List<dynamic> listOfString = {
        return json['name'];

      return listOfString;
    } else {
      throw Exception('Failed to load internet');

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("FutureBuilder & JSON")),
      body: FutureBuilder<List<dynamic>>(
        future: _fetchStrings(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(child: CircularProgressIndicator());
          return ListView(
            children: {
              return ListTile(
                title: Text(data.toString()),


You can use flutter command to run your app – $ flutter run

If everything goes well, you will see screen similar to the image below in your flutter device.

If you have any question or suggestions kindly use the comment box or you can contact us directly through our contact page below.

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