Building full-stack GraphQL applications with Hasura and Vue 3

GraphQL is a query language for APIs that provides a more efficient, powerful, and flexible alternative to the traditional REST API. It allows clients to request exactly the data they need, making it possible to get all required data in a single request, whereas REST typically requires multiple requests to different endpoints to gather related data.

Hasura is a GraphQL engine that instantly provides a real-time GraphQL API on top of a new or existing database. It allows you to connect multiple databases, manage CRUD operations with real-time capabilities, and handle complex queries efficiently. Additionally, it integrates authentication and permission management, making it easier to secure your data.

Key features of Hasura include automatic generation of CRUD GraphQL APIs from your databases, real-time queries through subscriptions, built-in support for handling database migrations, permission and role-based access control, and the ability to join data across multiple databases.

GraphQL subscriptions in Hasura allow you to maintain a real-time link with the database. When data changes in the database that matches the subscription query, Hasura sends the updated data to the client instantly. This feature is particularly useful for applications that require real-time functionalities like live updates.

Hasura supports various authentication methods including webhooks and JWT (JSON Web Tokens). You configure Hasura with your authentication provider, and it validates JWTs or webhook responses to authenticate and authorize users. This system allows you to implement complex security models including role-based access control.

GraphQL Code Generators are tools that automatically generate code for client-side GraphQL operations. You define your queries and mutations, and the tool generates corresponding types and hooks that you can use directly in your application. This helps maintain type safety and reduces boilerplate code.

Yes, Hasura can be connected to existing databases. It provides a flexible and powerful way to instantly create a real-time GraphQL API on top of existing database schemas. This makes it an ideal choice for projects that need to leverage existing database assets.

GraphQL Zeus provides a unique approach to working with GraphQL APIs by generating an SDK that allows for type-safe, dynamic query construction. It enables you to write queries that automatically adjust their types based on the fields you request, ensuring type safety and reducing the chance of runtime errors.

In GraphQL applications using Apollo, state can be managed using Apollo Client's local state management features. This allows you to manage both server-side and client-side state through a unified interface, using GraphQL for all data management. The approach can optimize data fetching and caching, although it may introduce complexity regarding cache management.