GraphQL to TypeScript

Convert GraphQL schema definitions to TypeScript interfaces and types. Generate type-safe code from your GraphQL API schema instantly.

Generation Options

GraphQL Schema

How to Convert GraphQL to TypeScript

  1. 1

    Paste Your GraphQL Schema

    Copy your GraphQL schema definition language (SDL) and paste it into the input editor. You can also upload a .graphql or .gql file directly using the upload button.
  2. 2

    Configure Generation Options

    Choose whether to generate TypeScript interfaces or type aliases, enable export keywords for module usage, toggle readonly properties for immutability, and decide whether to include input types.
  3. 3

    Generate TypeScript Output

    Click the Generate TypeScript button to convert your schema. The tool parses all type definitions, enums, input types, and scalar mappings into clean TypeScript code.
  4. 4

    Copy or Download the Result

    Review the generated TypeScript in the output panel. Copy it to your clipboard with one click and paste it directly into your project's type definition files.

Common Use Cases

1

Frontend API Integration

Generate TypeScript types that match your GraphQL API responses. Use the generated interfaces in React, Vue, or Angular components to get full autocomplete and compile-time type checking on every query result.
2

Backend Resolver Type Safety

Create shared type definitions between your GraphQL server and client code. Ensure resolver return types match the schema contract, catching mismatches before they reach production.
3

Schema-First Development

Design your API schema first, then generate TypeScript types for both frontend and backend teams. This approach keeps all stakeholders aligned on the data contract from day one.
4

Migration and Refactoring

When migrating from REST to GraphQL or refactoring an existing schema, regenerate TypeScript types to quickly identify breaking changes and update dependent code paths.

Why Generate TypeScript from GraphQL?

Type-safe code reduces runtime errors and improves developer experience. Generating TypeScript types from your GraphQL schema ensures your frontend code stays in sync with your API contract.

Converting GraphQL schemas to TypeScript types is an essential step in building type-safe full-stack applications. When your frontend code knows the exact shape of every API response, you eliminate an entire class of runtime errors caused by mismatched data structures. This free online converter parses your GraphQL SDL and produces clean, ready-to-use TypeScript interfaces or type aliases in seconds.

GraphQL's type system maps naturally to TypeScript. Object types become interfaces, enums translate to TypeScript enums or union types, and nullable fields are expressed with proper | null annotations. The converter handles scalar type mapping automatically, turning GraphQL's String, Int, Float, Boolean, and ID into their TypeScript equivalents. For teams using a schema-first workflow, this tool bridges the gap between API design and implementation. You can also validate your schema first with the GraphQL Schema Validator to catch syntax errors before generating types.

If you work with JSON-based APIs alongside GraphQL, you may find the JSON to TypeScript converter useful for REST endpoints, or the JSON to Zod Schema tool for runtime validation. For teams managing OpenAPI specs, the OpenAPI Validator and Swagger to OpenAPI Converter help keep REST documentation accurate. All processing happens entirely in your browser with no data uploaded to any server.

How It Compares

Manual type creation from GraphQL schemas is tedious and error-prone. Every time the schema changes, developers must update TypeScript types by hand, risking mismatches that only surface at runtime. Dedicated code generation tools like graphql-codegen are powerful but require complex configuration, plugin management, and a Node.js build step. This online converter provides a lightweight, zero-setup alternative for quick conversions and prototyping.

Unlike CLI-based codegen pipelines, this browser-based tool requires no installation, no configuration files, and no dependencies. Paste your schema, click generate, and copy the result. For production workflows with continuous integration, a build-step tool may be more appropriate, but for one-off conversions, schema exploration, or onboarding new team members, this instant converter saves significant time.

Tips for Better GraphQL to TypeScript Conversion

1
Use descriptive type names in your GraphQL schema since they become your TypeScript interface names directly.
2
Enable the readonly option when generating types for query responses to prevent accidental mutation of API data.
3
Prefer interfaces over type aliases if you plan to extend or merge your generated types with additional local properties.
4
Run this converter after every schema change to keep your frontend types synchronized with the API contract.
5
Combine this tool with the GraphQL Schema Validator to catch schema errors before generating TypeScript types.

FAQ

1

What GraphQL types are converted?

The converter handles type/interface definitions, input types, enums, and scalar types. It properly maps GraphQL scalars (String, Int, Float, Boolean, ID) to TypeScript equivalents.
2

How are nullable fields handled?

GraphQL fields without ! are treated as nullable and become 'type | null' in TypeScript. Optional markers (?) are added for nullable fields to match GraphQL semantics.
3

Should I use interfaces or type aliases?

Both work well. Interfaces are more common in OOP-style code and allow extension. Type aliases are more flexible for union types. Most teams prefer interfaces for GraphQL types.
4

Does this tool support custom scalar types?

Custom scalars are mapped to 'any' by default since the tool cannot know the underlying type. You can manually replace these with the correct TypeScript type after generation, such as Date for a DateTime scalar.
5

Can I use the generated types with Apollo Client or urql?

Yes. The generated interfaces work with any GraphQL client library. You can use them as generic type parameters in Apollo's useQuery or urql's hooks for full type safety on query results and variables.

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