GraphQL to TypeScript

GraphQL's schema system and TypeScript's type system are natural complements — both define the shape of data with typed fields, nested objects, arrays, and nullable values. The AllTools GraphQL to TypeScript converter generates TypeScript interfaces from GraphQL schema types and operations, producing type definitions that match exactly what the API returns. GraphQL scalar types map to TypeScript primitives: String becomes string, Int and Float become number, Boolean becomes boolean, and ID becomes string. Object types become TypeScript interfaces with their fields typed recursively. Nullable fields (without ! in GraphQL) become optional properties or union types with null. Lists become typed arrays. Enums map directly to TypeScript enum types. Union types and interfaces in GraphQL generate discriminated union types in TypeScript. The generated types enable IntelliSense autocompletion for query results, compile-time error detection when accessing non-existent fields, and refactoring safety when schema changes affect client code. All code generation runs in the browser — your GraphQL schemas, which define your API's data model and may reveal proprietary business entity structures, never leave your device.

In production GraphQL projects, code generation from schemas is a standard practice that the AllTools converter simplifies for quick tasks. The full GraphQL code generation ecosystem includes tools like graphql-codegen (by The Guild) which generates types, hooks, and document nodes from schemas and operations, Apollo CLI which generates types specifically for Apollo Client usage, and Relay compiler which generates types for the Relay framework. These tools run as part of the build pipeline, watching for schema and query changes. The AllTools converter serves the ad-hoc use case — quickly generating types from a schema snippet when you don't have the full codegen pipeline running, when exploring a new API's schema to understand its structure, when creating types for a proof-of-concept before setting up proper codegen, or when generating types for a one-off script that queries a GraphQL API. The generated types follow the same patterns used by graphql-codegen, producing compatible TypeScript that can later be replaced by automated code generation without refactoring consumer code. For teams evaluating GraphQL adoption, the converter demonstrates the type safety benefits of combining GraphQL schemas with TypeScript.