---
title: "GraphQL to TypeScript"
description: "Convert GraphQL schema definitions to TypeScript interfaces and types. Generate type-safe code from your GraphQL API schema instantly."
url: https://findutils.com/developers/graphql-to-typescript/
category: developers
---

# GraphQL to TypeScript

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

**Use this tool:** [GraphQL to TypeScript](https://findutils.com/developers/graphql-to-typescript/)

## Programmatic access

- REST id `graphql-to-typescript`: POST https://api.findutils.com/api/tools/graphql-to-typescript/execute (reference: https://findutils.com/api/graphql-to-typescript/)
- MCP tool `graphql_to_typescript` on https://mcp.findutils.com (reference: https://findutils.com/mcp/graphql-to-typescript/)

## 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.

## Tips for Better GraphQL to TypeScript Conversion

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

## FAQ

### 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.

### 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.

### 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.

### 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.

### 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<T> or urql's hooks for full type safety on query results and variables.

### Is my GraphQL schema uploaded to a server?

No. All conversion happens entirely in your browser using client-side JavaScript. Your schema never leaves your machine, making this tool safe for proprietary or sensitive API schemas.

### How does this compare to graphql-codegen?

graphql-codegen is a full build-step tool with plugins, config files, and CI integration. This online converter is a lightweight alternative for quick one-off conversions, prototyping, or when you do not want to set up a codegen pipeline.

### Does it handle GraphQL unions and fragment types?

Union types are converted to TypeScript union types using the pipe operator. For example, a GraphQL union 'SearchResult = User | Post' becomes 'type SearchResult = User | Post' in TypeScript.

### Can I convert only part of a schema?

Yes. You can paste a subset of your schema containing only the types you need. The converter processes whatever valid type definitions it finds without requiring a complete schema.

### What file formats can I upload?

You can upload.graphql.gql, or plain.txt files containing GraphQL SDL. The tool reads the file content and processes it the same way as pasted text.

## Related Tools

- [GraphQL Schema Validator](https://findutils.com/developers/graphql-schema-validator/)
- [JSON to TypeScript](https://findutils.com/developers/json-to-typescript/)
- [JSON to Zod Schema](https://findutils.com/developers/json-to-zod-schema/)
- [OpenAPI Validator](https://findutils.com/developers/openapi-validator/)
- [Swagger to OpenAPI](https://findutils.com/developers/swagger-to-openapi/)
- [API Docs Generator](https://findutils.com/developers/api-docs-generator/)
- [JSON Schema Generator](https://findutils.com/developers/json-schema-generator/)
- [JSON Schema Validator](https://findutils.com/developers/json-schema-validator/)