JSON to Language Struct / Class Generator
About GraphQL → TypeScript
The GraphQL Schema to TypeScript Types & Codegen Studio converts GraphQL SDL definitions (`type`, `input`, `enum`, `union`, `interface`) into strongly-typed TypeScript interfaces, type aliases, and Apollo/Relay query types.
How to Use GraphQL → TypeScript
Step 1
Paste your GraphQL SDL schema or query document.
Step 2
Select output style (Interfaces or Type Aliases) and null handling.
Step 3
Review the generated TypeScript code.
Step 4
Click "Copy TypeScript".
Practical Use Cases for GraphQL → TypeScript
End-to-End Type Safety for React & Next.js GraphQL Clients
Convert GraphQL backend schemas into TypeScript types for Apollo Client, URQL, TanStack Query, and GraphQL Request clients.
Generating Typed GraphQL Resolvers
Auto-generate TypeScript resolver signature interfaces and context types for Apollo Server and Yoga GraphQL backends.
Input & Output Examples
Converting GraphQL Type to TypeScript Interface
`type User { id: ID! name: String! email: String roles: [UserRole!]! } enum UserRole { ADMIN USER }``export interface User {\n id: string;\n name: string;\n email?: string | null;\n roles: UserRole[];\n}\n\nexport type UserRole = "ADMIN" | "USER";`Key Features & Performance
- ✓Maps GraphQL types, inputs, enums, unions, and interfaces to idiomatic TypeScript declarations.
- ✓Scalar mappings: `ID` $\\rightarrow$ `string`, `String` $\\rightarrow$ `string`, `Int`/`Float` $\\rightarrow$ `number`, `Boolean` $\\rightarrow$ `boolean`.
- ✓Configurable nullable modifiers (optional `?` or `| null`).
- ✓100% Client-Side memory execution.
- ✓1-Click Copy TypeScript code.
Key Terminology & Definitions
GraphQL Codegen
The automated generation of typed code (TypeScript, Flow, Java) directly from GraphQL schema definitions and operation documents.
Nullable vs Optional in GraphQL
In GraphQL, fields without `!` are nullable (can return null); in TypeScript they can be represented as `T | null` or optional `T?`.