GraphQL API Certification

Module 1: Introduction to GraphQL

• GraphQL overview
• API development concepts
• GraphQL architecture
• GraphQL ecosystem
• Common use cases
• GraphQL workflow

Module 2: GraphQL vs REST

• REST architecture
• GraphQL architecture
• Endpoint differences
• Data fetching
• Over-fetching
• Under-fetching

Module 3: GraphQL Environment Setup

• Development environment
• GraphQL server
• Project structure
• Development tools
• GraphQL IDE
• First GraphQL operation

Module 4: GraphQL Schema Fundamentals

• Schema Definition Language
• Schema structure
• Object types
• Fields
• Scalar types
• Schema design

Module 5: GraphQL Type System

• Scalar types
• Object types
• Enumeration types
• List types
• Non-null types
• Custom scalars

Module 6: GraphQL Queries

• Query operations
• Fields
• Nested fields
• Query execution
• Response structure
• Query design

Module 7: Arguments & Variables

• Field arguments
• Query arguments
• Variables
• Default values
• Input validation
• Dynamic queries

Module 8: Aliases & Fragments

• Field aliases
• Reusable fragments
• Inline fragments
• Fragment variables
• Query organisation
• Reducing duplication

Module 9: GraphQL Mutations

• Mutation concepts
• Creating data
• Updating data
• Deleting data
• Mutation responses
• Mutation design

Module 10: Input Types

• Input objects
• Input fields
• Required inputs
• Optional inputs
• Nested inputs
• Input validation

Module 11: Resolvers

• Resolver functions
• Parent arguments
• Resolver arguments
• Context
• Resolve information
• Resolver organisation

Module 12: Database Integration

• Database connectivity
• Data models
• CRUD operations
• Resolver integration
• Data relationships
• Persistence strategies

Module 13: Authentication

• Authentication concepts
• User login
• Token authentication
• JWT concepts
• Authentication context
• Protected operations

Module 14: Authorisation

• Roles and permissions
• Field-level access
• Resolver-level access
• Resource ownership
• Access control
• Authorisation strategies

Module 15: Error Handling

• GraphQL errors
• Validation errors
• Resolver errors
• Custom errors
• Error responses
• Error logging

Module 16: Interfaces & Unions

• GraphQL interfaces
• Implementing interfaces
• Union types
• Type resolution
• Polymorphic data
• Advanced schema modelling

Module 17: Pagination, Filtering & Sorting

• Pagination concepts
• Offset pagination
• Cursor-based pagination
• Filtering
• Sorting
• Query parameters

Module 18: GraphQL Subscriptions

• Subscription concepts
• Real-time APIs
• Events
• WebSocket concepts
• Subscription resolvers
• Real-time updates

Module 19: GraphQL Security

• Query validation
• Query depth
• Query complexity
• Rate limiting
• Input security
• Access protection

Module 20: Testing GraphQL APIs

• Query testing
• Mutation testing
• Resolver testing
• Authentication testing
• Error testing
• Integration testing

Module 21: Performance & Optimisation

• N+1 query problem
• DataLoader concepts
• Batching
• Caching
• Query optimisation
• Performance monitoring

Module 22: Production-Ready GraphQL APIs

• API architecture
• Schema organisation
• Logging
• Monitoring
• Deployment considerations
• Maintenance practices