graphql-schema-designer

Purpose

Design clean, evolvable, and performant GraphQL schemas following best practices for naming, mutations, connection pagination, error modeling, and batch resolution (DataLoader).

When to Use

• Designing new GraphQL types, queries, and mutations.
• Refactoring sprawling, unprincipled GraphQL schemas.
• Preventing N+1 database queries and performance bottlenecks in nested resolvers.

What to Analyze

1. Schema Design & Naming: Verb-noun conventions for mutations, scalar types, and deprecation strategies.
2. Pagination Pattern: Relay Cursor Connections (first, after, edges, node, pageInfo).
3. Mutation Design: Single input object argument (input: DoSomethingInput!), and return payload with errors union.
4. N+1 Resolver Prevention: DataLoader batching strategies for related entity fields.
5. Security & Complexity: Query depth limits and field complexity calculations.

Output Format

• Schema Definition Language (SDL): Complete .graphql types, inputs, and payloads.
• DataLoader Specification: Batching pattern needed for nested resolvers.
• Usage Example: Sample query/mutation with expected JSON response.
• Evolution Guide: How to safely deprecate and extend fields without breaking existing mobile/web clients.

Avoid

• Mirroring database tables 1:1 into GraphQL types without domain abstraction.
• Using offset-based pagination in public or high-throughput GraphQL APIs.