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Connect your Flutter/Dart apps to Hasura simply.

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Hasura Connect Package

Connect your Flutter/Dart apps to Hasura simply.

What can he do

The hasura_connect is designed to facilitate Hasura's integration with Flutter applications, leveraging the full power of Graphql.

  • Use Query, Mutation and Subscriptions the easy way.
  • Offline cache for Subscription and Mutation made from a Snapshot.
  • Easy integration with leading dart providers (Provider, bloc_pattern).
  • Pass your JWT Token easily if you are informed when it is invalid.


Add dependency in your pubspec.yaml file:

or use Slidy:
slidy install hasura_connect


A simple usage example:

import 'package:hasura_connect/hasura_connect.dart';

String url = 'http://localhost:8080/v1/graphql'; HasuraConnect hasuraConnect = HasuraConnect(url);

You can encapsulate this instance into a BLoC class or directly into a Provider.

Create a document with Query:

String docQuery = """
  query {
    authors {

Now just add the document to the "query" method of the HasuraConnect instance.

//get query
var r = await hasuraConnect.query(docQuery);

//OR USE MUTATION var r = await hasuraConnect.mutation(docQuery);


Subscriptions will notify you each time you have a change to the searched items. Use the "hasuraConnect.subscription" method to receive a stream.

Snapshot snapshot = await hasuraConnect.subscription(docSubscription);
  snapshot.listen((data) {
  }).onError((err) {

Using variables

Variables maintain the integrity of Querys, see an example:

String docSubscription = """
  subscription algumaCoisa($limit:Int!){
    users(limit: $limit, order_by: {user_id: desc}) {

Snapshot snapshot = await hasuraConnect.subscription(docSubscription, variables: {"limit": 10});

//change values of variables for PAGINATIONS snapshot.changeVariable({"limit": 20});


This is a good strategy to control the flow of requests. With that we can create interceptors for logs or cache for example. The community has already provided some interceptors for caching. Interceptors are highly customizable.

View Hasura's official Authorization documentation.

class TokenInterceptor extends Interceptor {
  final FirebaseAuth auth;

@override Future onConnected(HasuraConnect connect) {}

@override Future onDisconnected() {}

@override Future onError(HasuraError request) async { return request; }

@override Future onRequest(Request request) async { var user = await auth.currentUser(); var token = await user.getIdToken(refresh: true); if (token != null) { try { request.headers["Authorization"] = "Bearer ${token.token}"; return request; } catch (e) { return null; } } else {"/login"); } }

@override Future onResponse(Response data) async { return data; }

@override Future onSubscription(Request request, Snapshot snapshot) {}

@override Future onTryAgain(HasuraConnect connect) {} }


Now you can intercept all requests, erros, subscritions.... all states of your hasura_connect connection.

  • onConnected
  • onDisconnected
  • onError
  • onRequest
  • onResponse
  • onSubscription
  • onTryAgain


Now you will need to create a Interceptor or use a Cache Interceptor Package made to help you like: InMemory , Hive or SharedPreference

//In Memory
import 'package:hasura_cache_interceptor/hasura_hive_cache_interceptor.dart';

final storage = MemoryStorageService(); final cacheInterceptor = CacheInterceptor(storage); final hasura = HasuraConnect( "", interceptors: [cacheInterceptor], httpClient: httpClient, )

import 'package:hasura_connect/hasura_connect.dart';
import 'package:hasura_hive_cache_interceptor/hasura_hive_cache_interceptor.dart';

final cacheInterceptor = HiveCacheInterceptor(" (optional)"); final hasura = HasuraConnect( "", interceptors: [cacheInterceptor], httpClient: httpClient, )

//Shared Preference
import 'package:hasura_connect/hasura_connect.dart';
import 'package:shared_preferences_cache_interceptor/shared_preferences_cache_interceptor.dart';

final cacheInterceptor = SharedPreferencesCacheInterceptor(); final hasura = HasuraConnect( "", interceptors: [cacheInterceptor], httpClient: httpClient, )


HasuraConnect provides a dispose() method for use in Provider or BlocProvider. Subscription will start only when someone is listening, and when all listeners are closed HasuraConnect automatically disconnects.

Therefore, we only connect to Hasura when we are actually using it;


This is currently our roadmap, please feel free to request additions/changes.

| Feature | Progress | | :------------------------------------- | :------: | | Queries | ✅ | | Mutations | ✅ | | Subscriptions | ✅ | | Change Variable in Subscriptions | ✅ | | Auto-Reconnect | ✅ | | Dynamic JWT Token | ✅ | | bloc_pattern Integration | ✅ | | Provider Integration | ✅ | | Variables | ✅ | | Cache Subscription | ✅ | | Cache Mutation | ✅ | | Cache Query | ✅ |

Features and bugs

Please send feature requests and bugs at the issue tracker.

Created from templates made available by Stagehand under a BSD-style license.

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