GraphQL

By the end of the graphql course, you’ll understand the full lifecycle of a GraphQL service — from schema design and query creation to client integration and performance optimisation. You’ll gain the confidence to build, test, and maintain GraphQL APIs, write advanced queries, and apply best practices effectively in real-world development environments.

From rest to graphql

Start by exploring the evolution of APIs and the role GraphQL plays in modern web development. You’ll review the fundamentals of APIs, HTTP, and JSON to understand how REST-based systems operate and where they encounter limitations. Then, discover how GraphQL overcomes these challenges by eliminating over-fetching, improving query precision, and streamlining client-server communication.

Core principles and service design

Learn the essential building blocks of GraphQL, including queries, mutations, types, and schemas. This section focuses on how these components interact to form a complete GraphQL service. You’ll explore service architecture, schema design, and the request-response lifecycle, gaining a clear understanding of how GraphQL’s strongly typed structure improves consistency, scalability, and developer experience.

Service creation and client integration

Develop and deploy your own GraphQL services using frameworks suited to your preferred language — such as Apollo (JavaScript), Ariadne (Python), or Spring Boot (Java). You’ll also build clients using HttpClient, Apollo Client, or GQL, depending on your environment. This hands-on section allows you to design, implement, and test complete GraphQL workflows using guided exercises and practical labs.

Writing queries and mastering types

Dive deeper into creating complex queries and mutations. Learn how to work with GraphQL’s powerful type system to manage relationships, nested data, and reusable fragments. You’ll also cover variables, arguments, and interfaces to build efficient and flexible data requests that scale with your applications.