GraphQL Fundamentals Training in Dhaka, Bangladesh

This course introduces the core concepts of GraphQL, a modern query language for APIs, enabling clients to request only the data they need. Participants will explore the architecture, syntax, types, schemas, and resolvers of GraphQL, and learn how to build and consume GraphQL APIs. The course also includes practical sessions on integrating GraphQL with frontend and backend technologies.

Course Agenda

Introduction to GraphQL

• What is GraphQL and why use it?

• GraphQL vs REST

• GraphQL architecture overview

Core GraphQL Concepts

• Types, Fields, and Arguments

• Queries and Mutations

• Aliases and Fragments

• Variables and Directives

Schema Design

• Defining schema with types

• Input types and enums

• Structuring modular and scalable schemas

Setting Up a GraphQL Server

• Apollo Server or Express integration

• Creating resolvers

• Connecting GraphQL to databases

Querying GraphQL APIs

• Using GraphQL Playground

• Nested queries and pagination

• Handling errors and custom responses

Security, Caching & Tooling

• Query complexity and depth limiting

• Authentication and authorization

• Caching strategies and introspection

• Popular tools and ecosystem overview

Hands-on Exercises