GraphQL Schema to TypeScript Generator

Convert GraphQL schema definitions (SDL) into type-safe TypeScript interfaces, enums, unions, and input types.

At a glance

GraphQL Schema to TypeScript Generator is a free developer tool that converts GraphQL Schema Definition Language (SDL) into type-safe TypeScript interfaces. It transforms object types, inputs, enums, unions, and scalars with accurate nullability and array wrapping 100% client-side in browser memory.

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100% Client-Side GraphQL Schema to TypeScript Generator

Zero Server Uploads

Transform GraphQL Schema Definition Language (SDL) into type-safe TypeScript interfaces, enums, unions, and input types with inverted nullability mapping.

Local Sandbox
Presets:
0 types 0 enums 0 unions

Complete SDL Specification

Full AST parsing for Object types, Input types, Enums, Unions, Custom Scalars, and Interface implements clauses.

Inverted Nullability Engine

Strict adherence to GraphQL nullability conventions: non-null types (!) produce required fields, while unadorned types map to type | null.

100% In-Browser Privacy

All code generation executes client-side in browser RAM. Proprietary internal API schemas and backend data contracts never leave your machine.

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Why Use This GraphQL Schema to TypeScript Generator?

100% Client-Side Privacy: Your private API schemas never leave your device or reach external servers.
Complete GraphQL SDL Coverage: Parses types, interfaces, inputs, enums, unions, and custom scalars.
Inverted Nullability Engine: Accurately converts non-null (!) to required types and unadorned types to type | null.
Flexible Configuration: Configurable nullability strategies (null, optional, hybrid) and enum formats.
Docstring Preservation: Converts GraphQL description strings and triple-quote blocks into clean JSDoc comments.

How to Use GraphQL Schema to TypeScript Generator

1

Enter GraphQL Schema

Paste your GraphQL SDL into the editor or pick one of the pre-loaded templates.

2

Configure Generation Options

Select your preferred nullability strategy and enum representation format.

3

Copy or Download TypeScript

Copy the generated TypeScript interfaces to your clipboard or download as a schema.d.ts file.

GraphQL Schema to TypeScript Interface example

Demonstrates converting a GraphQL object type with non-null ID, required name, nullable email, and a non-null list of non-null strings into a type-safe TypeScript interface.

Sample GraphQL SDL Source 
type User {
  id: ID!
  name: String!
  email: String
  tags: [String!]!
}
Generated TypeScript Interface Processed 
export interface User {
  id: string;
  name: string;
  email: string | null;
  tags: string[];
}

Technical Specifications & Engine Details

Technical specifications and engine details for GraphQL Schema to TypeScript Generator
Specification Details
Supported Formats TEXT/PLAIN, .GRAPHQL, .GQL → TEXT/PLAIN, .TS, .D.TS
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Modern browser with JavaScript enabled.
Performance Constraints Runs client-side in browser memory. Performance and file limits are bounded by available local device RAM.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

Your schema remains strictly on your local device. Zero data is transmitted to external servers.

Frequently Asked Questions

How does this generator handle GraphQL nullability?
In GraphQL, fields without an exclamation mark are nullable by default. This tool maps non-null fields (String!) to required TypeScript types (string) and nullable fields (String) to string | null (or optional fields based on your options).
Can I convert custom GraphQL scalars like DateTime or JSON?
Yes. Built-in defaults map Date, DateTime, and Time to string, and JSON/JSONObject to Record<string, any>. Unknown custom scalars default to type alias any.
Is my GraphQL schema kept private?
Yes. All parsing and code generation executes 100% locally in your browser memory. No schema definitions or proprietary API models are ever sent to an external server.

Methodology

This tool runs entirely in your browser. The example above shows a representative input and the result it produces.

Last updated .

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