GraphQL Schema to JSON Schema Converter

Transform GraphQL SDL types, inputs, unions, and enums into standard Draft-07 JSON Schema validation definitions.

At a glance

GraphQL to JSON Schema Converter is a free developer utility that transforms GraphQL Schema Definition Language (SDL) types, inputs, and enums into standard Draft-07 JSON Schema documents. It maps GraphQL scalar types, required fields, enums, and nested objects 100% client-side in browser memory.

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100% Client-Side GraphQL to JSON Schema Converter

Zero Server Uploads

Transform GraphQL Schema Definition Language (SDL) types, inputs, unions, and enums into standard Draft-07 & Draft 2020-12 JSON Schema.

Local Sandbox
Presets:
0 types 0 inputs 0 enums

Standard Draft Compliance

Supports standard JSON Schema Draft-07 (definitions) and Draft 2020-12 ($defs) schemas ready for validation libraries like Ajv and Hyperjump.

Accurate Nullability & Lists

Translates non-null GraphQL assertions (!) into JSON Schema required arrays and properly models list items and enums.

100% In-Memory Processing

Zero external API requests or server telemetries. All AST tokenization, traversal, and schema generation executes locally in browser JavaScript memory.

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Why Use This GraphQL Schema to JSON Schema Converter?

100% Client-Side Privacy: Your GraphQL schemas never leave your device or touch any server.
Draft-07 & Draft 2020-12: Full support for standard JSON Schema drafts with definitions or modern $defs.
Accurate Nullability Mapping: Automatically translates GraphQL non-null assertions (!) into JSON Schema required arrays.
Full Construct Support: Converts object types, input types, enums, unions, and custom scalars seamlessly.
Root as $ref Bundle Option: Easily package complete schemas into reusable root reference bundles.

How to Use GraphQL Schema to JSON Schema Converter

1

Input GraphQL SDL

Paste your GraphQL Schema Definition Language (SDL) or load one of the built-in presets.

2

Select Schema Draft

Choose between Draft-07 (definitions) or Draft 2020-12 ($defs) and customize root options.

3

Copy or Download

Copy the generated JSON Schema to clipboard or download it directly as schema.json.

GraphQL Schema to JSON Schema Conversion example

Demonstrates converting a GraphQL User type with required scalar fields and an enum into standard Draft-07 JSON Schema with definitions.

Sample GraphQL SDL Source 
type User {
  id: ID!
  name: String!
  email: String!
  role: Role!
}

enum Role {
  USER
  ADMIN
}
Generated JSON Schema Processed 
{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "title": "User",
  "properties": {
    "id": { "type": "string" },
    "name": { "type": "string" },
    "email": { "type": "string" },
    "role": { "$ref": "#/definitions/Role" }
  },
  "required": ["id", "name", "email", "role"],
  "definitions": {
    "Role": {
      "type": "string",
      "enum": ["USER", "ADMIN"]
    }
  }
}

Technical Specifications & Engine Details

Technical specifications and engine details for GraphQL Schema to JSON Schema Converter
Specification Details
Supported Formats TEXT, GRAPHQL → JSON
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Modern browser with JavaScript enabled.
Performance Constraints Runs 100% 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 GraphQL to JSON Schema?
Fields with the non-null assertion (!) in GraphQL SDL are added to the parent object's required array in JSON Schema. Unadorned nullable fields are omitted from required, and nullable list items are typed with ['type', 'null'].
Which JSON Schema drafts are supported?
The converter supports both Draft-07 (using the definitions keyword for secondary types) and modern Draft 2020-12 (using the $defs keyword).
Is my schema data private?
Yes. All conversion logic executes 100% client-side in your browser memory. No 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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