How to Build a Full-Stack Mobile Application With Flutter, Fauna, and GraphQL

Building a Flutter App With a Fauna GraphQL Backend

Flutter’s cross-platform UI toolkit pairs naturally with Fauna, a serverless, transactional database with native GraphQL support. Together, they let you assemble a full-stack mobile application without provisioning servers or hand-rolling a REST API. This walkthrough covers the essential pipeline: creating a Fauna database, importing a GraphQL schema, wiring up a GraphQL client in Flutter, and running live queries and mutations from your widgets.

The example app is a simple character tracker where users can add, update, and delete favorite movie and TV characters. The complete source code is available on GitHub.

By the end, you’ll know how to:

• Provision a Fauna instance and generate an admin key.
• Define and import a GraphQL schema.
• Configure a GraphQL client inside Flutter.
• Execute queries and mutations against the Fauna backend.

Creating Your Fauna Database and Admin Key

Start by registering at fauna.com and creating a new database. Name it flutter_demo (or anything you prefer) and choose the classic region group. Fauna’s region groups allow low-latency reads and writes from distributed locations, functioning like a content delivery network for your data layer.

After the database exists, open the security tab and create a new key. For this project, use the admin role; it grants full management access to the database, including documents, indexes, and user-defined roles. Keep this key secret — you’ll need it for every GraphQL operation.

Defining the GraphQL Schema and Flutter Project

With the backend ready, create a new Flutter project and add a GraphQL schema file at graphql/schema.graphql. Fauna treats collections like SQL tables; we’ll define a single Character collection with typed properties such as name, description, and picture. You also define a query in the schema that returns a list of characters.

Back in the Fauna dashboard, open the GraphQL tab and import the schema. Fauna auto-generates the corresponding GraphQL queries and mutations for CRUD operations. If auto-generated operations don’t give you enough control, Fauna supports custom resolvers for more precise business logic.

Adding Dependencies and Client Configuration

To interact with GraphQL from Flutter, add two packages to pubspec.yaml: graphql_flutter (the GraphQL client) and hive (a local key-value store used to cache query results).

Next, create lib/client_provider.dart with a provider class holding your Fauna configuration. A GraphQLClient needs both a cache and a link. Use AuthLink to inject the admin key as a token in the request headers. For this demo the key is hardcoded — in production you must store security credentials outside the source tree.

Wrap the client in a ValueNotifier so it can be shared, then expose it to the widget tree. Finally, update main.dart to wrap the root widget with ClientProvider. Any widget downstream can now run queries and mutations against Fauna.

Building the App Pages and Hooking Up GraphQL

Start with a list widget to display the characters. A simple widget populated with placeholder data gets you running quickly, but the real goal is to replace those hardcoded strings with results fetched from the database.

Querying All Characters

From Fauna’s GraphQL playground, you can test the query that fetches every character. To call it inside the app, wrap the list widget in the Query widget from graphql_flutter. Pass the query string into the options argument. The pollInterval parameter controls how often the data refetches; set any float you like. The builder function receives the result, a refetch callback, and a fetch-more callback, which you can pass further down the widget tree.

Update the CharacterTile widget to render fields from the fetched character objects.

Adding New Characters

To insert data, run a createCharacter mutation. The Mutation widget works like Query, but adds an onComplete callback that returns the database result once the operation finishes. Build a simple form widget that submits user input through this mutation.

Deleting and Editing Records

Deletion is the matching deleteCharacter mutation, triggered from a button inside CharacterTile.

Editing follows the same pattern. Create an edit form at lib/screens/edit.dart that runs the updateCharacter mutation with the modified fields. The structure mirrors the add form; only the mutation name and pre-filled input change.

Next Steps With Flutter and Fauna

This tutorial only scratches the surface of the Fauna ecosystem. Fauna offers an autoscaling, transactional backend suitable for production mobile apps without pricing in operational overhead. For deeper work, consult Fauna’s official documentation and the graphql_flutter GitHub repository for advanced client features.