GraphQL Schema Design
Types, Interfaces, Pagination & Schema Evolution
A well-designed GraphQL schema is the contract between your API and every client that consumes it. This page explores the type system hierarchy, the difference between interfaces and unions, pagination patterns (offset vs cursor vs keyset), and strategies for evolving your schema without breaking existing clients. Every section is interactive — click, toggle, and page through live examples.
Type System Visualization
Explore how GraphQL types connect. Click any type to expand its fields and resolver info.
Interfaces vs Unions
Toggle between interface and union mode to see how query syntax and type resolution differ.
Schema Definition
Query
Response
Type Resolution
Pagination Patterns
Compare offset, cursor, and keyset pagination. See what happens when data is inserted mid-pagination.
Query
Data List
Result
Schema Evolution
Step through schema versions and see how deprecation keeps clients working during migrations.