TypeScript to GraphQL Schema Converter

Convert TypeScript interfaces, types, and enums into valid GraphQL Schema Definition Language (SDL) queries.

At a glance

TypeScript to GraphQL Schema Converter is a free developer utility that transforms TypeScript interfaces, types, and enums into standard GraphQL Schema Definition Language (SDL). It automatically maps scalar types, optional fields, arrays, and unions 100% client-side in browser memory.

Universal Switcher:
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Developer Suite: TypeScript to GraphQL GraphQL to TypeScript Drizzle to Prisma Prisma to Drizzle Zod to Prisma Prisma to Zod Drizzle to SQL

100% Client-Side TypeScript to GraphQL Schema Converter

Zero Server Uploads

Transform TypeScript interfaces, types, and enums into standard GraphQL Schema Definition Language (SDL) with automatic inverted nullability.

Local Sandbox
Presets:
0 interfaces 0 enums 0 unions

TypeScript Construct Parsing

Seamlessly converts interface, type object literals, TypeScript enums, union types, and inheritance hierarchies.

Inverted Nullability Engine

Maps required TypeScript fields to non-null GraphQL types (!), and optional (?) or null fields to unadorned nullable types.

100% In-Browser Privacy

Zero server calls or cloud dependencies. Your proprietary TypeScript data models and domain types never leave your local device.

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Why Use This TypeScript Interface to GraphQL Schema Converter?

100% Client-Side Privacy: Your private data models never leave your browser or touch remote servers.
Automatic Inverted Nullability: Seamlessly converts TypeScript required fields to non-null (!) and optional/null fields to standard nullable types.
Intelligent Input Inversion: Automatically maps *Input and *Args interfaces to GraphQL input blocks.
Comprehensive SDL Support: Accurately converts interfaces, object types, enums, unions, and ID scalar detection.
JSDoc Description Preservation: Transforms /** ... */ docstrings into standard GraphQL multi-line descriptions.

How to Use TypeScript Interface to GraphQL Schema Converter

1

Enter TypeScript Interfaces

Paste your TypeScript interfaces, types, or enums into the input editor or load a preset.

2

Configure Schema Options

Toggle ID property detection, input suffix mapping, default numeric scalar, and JSDoc preservation.

3

Copy or Download Schema

Copy the generated GraphQL SDL directly to your clipboard or download it as schema.graphql.

TypeScript Interface to GraphQL Schema example

Demonstrates converting a TypeScript interface with required ID and name, optional bio, and a non-null string array into standard GraphQL SDL with inverted nullability.

Sample TypeScript Interface Source 
interface User {
  id: string;
  name: string;
  bio?: string;
  tags: string[];
}
Generated GraphQL Schema Processed 
type User {
  id: ID!
  name: String!
  bio: String
  tags: [String!]!
}

Technical Specifications & Engine Details

Technical specifications and engine details for TypeScript Interface to GraphQL Schema Converter
Specification Details
Supported Formats TEXT/PLAIN, .TS, .TSX → TEXT/PLAIN, .GRAPHQL, .GQL
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 files remain strictly on your local device. Zero data is transmitted to external servers.

Frequently Asked Questions

How does nullability mapping work from TypeScript to GraphQL?
In TypeScript, fields are required by default, while in GraphQL fields are nullable by default. This converter inverts the convention: standard TypeScript fields become non-null (String!), while optional (? or | null) fields become nullable (String).
How are input types distinguished from object types?
By default, interfaces or types whose names end in Input or Args (such as CreateUserInput) are automatically generated as input blocks instead of standard type blocks.
Is my TypeScript code kept private?
Yes. All conversion logic executes 100% locally in your browser memory. No code or schema data is ever transmitted over the network.

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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