Web Development

Dart GraphQL APIs

Building GraphQL APIs

Dart GraphQL APIs use graphql package for typed queries.

Introduction to GraphQL in Dart

GraphQL is a powerful query language for APIs that allows clients to request exactly the data they need. In Dart, the graphql package provides a robust solution for building GraphQL APIs with type-safe queries. This guide will walk you through setting up and using GraphQL in your Dart applications.

Setting Up the GraphQL Package

To begin using GraphQL in your Dart application, you first need to add the graphql package to your pubspec.yaml file:

After adding the dependency, run flutter pub get or pub get to install the package.

Creating a GraphQL Client

Once the package is installed, you can create a GraphQL client to communicate with your GraphQL server. Here's how you can set up a basic client:

Performing a Query

With the client set up, you can perform queries against your GraphQL server. Here is an example of how to perform a simple query:

This example defines a query to fetch the last 50 repositories for a user and then executes the query using the client.query method. The response data can be accessed from the result.data.

Mutations in GraphQL

Mutations are used in GraphQL to modify server-side data. Here is an example of how to perform a mutation using the graphql package in Dart:

This mutation example adds a star to a repository by its ID. The mutation uses variables to pass the required data to the server.

Conclusion

Integrating GraphQL into your Dart applications allows for efficient and flexible data queries. By using the graphql package, you can easily implement both queries and mutations with type safety, making your codebase more robust and maintainable.

Web Development

Previous: REST APIs
Next: WebSockets