GraphQL Schema to JSON Schema Converter

Convert GraphQL SDL types, inputs, enums, and unions into standardized JSON Schema specifications in your browser.

At a glance

GraphQL Schema to JSON Schema Converter transforms GraphQL SDL types, inputs, enums, and unions into valid JSON Schema (Draft-07 and 2020-12) specifications. It maps scalar types, lists, non-null assertions to required arrays, and extracts sub-types into compliant $defs schemas in browser memory.

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100% Client-Side In-Browser GraphQL to JSON Schema Converter

Compile GraphQL SDL types, inputs, enums, and unions directly into standard JSON Schema (Draft-07 & 2020-12) documents in browser memory.

Pure In-Browser
Presets:
Valid SDL 0 chars
JSON Schema Generation Options
0 chars
0 definitions
SDL Topology:
Types 0
Inputs 0
Enums 0
Unions 0

Why Use This GraphQL Schema to JSON Schema Converter?

100% Client-Side Privacy: Your GraphQL schemas and data models never leave your browser sandbox.
Full SDL Grammar Support: Handles types, inputs, interfaces, enums, unions, and custom scalars.
Dual Draft Output: Generate modern Draft 2020-12 ($defs) or legacy Draft-07 (definitions) schemas.
Docstrings Preservation: Preserves block and inline GraphQL descriptions directly into schema descriptions.

How to Use GraphQL Schema to JSON Schema Converter

1

Paste GraphQL SDL

Enter or paste your GraphQL schema definition containing types, inputs, enums, or unions.

2

Select Schema Draft

Choose between Draft 2020-12 ($defs) or Draft-07 (definitions) and select your target root type.

3

Copy or Download Schema

Review generated JSON Schema, copy to clipboard, or export as a .json file.

GraphQL SDL to JSON Schema Draft 2020-12 Output

Converts GraphQL User type into a JSON Schema object with required fields and extracts the Role enum into $defs.

GraphQL SDL Input Source 
"""
User account record
"""
type User {
  id: ID!
  username: String!
  role: Role!
  tags: [String!]!
}

enum Role {
  ADMIN
  MEMBER
}
Generated JSON Schema (Draft 2020-12) Processed 
{
  "$schema": "https://json-schema.org/draft-2020-12/schema",
  "title": "User",
  "description": "User account record",
  "type": "object",
  "properties": {
    "id": { "type": "string" },
    "username": { "type": "string" },
    "role": { "$ref": "#/$defs/Role" },
    "tags": { "type": "array", "items": { "type": "string" } }
  },
  "required": ["id", "username", "role", "tags"],
  "$defs": {
    "Role": {
      "type": "string",
      "enum": ["ADMIN", "MEMBER"]
    }
  }
}

Technical Specifications & Engine Details

Technical specifications and engine details for GraphQL Schema to JSON Schema Converter
Specification Details
Supported Formats TEXT/PLAIN, APPLICATION/GRAPHQL, .GRAPHQL, .GQL → APPLICATION/JSON, TEXT/PLAIN, .JSON
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

Are my GraphQL schemas transmitted to any remote servers?
No. All SDL lexing, AST parsing, and JSON Schema generation execute 100% locally in your browser. Your API structures and entity designs remain strictly private.
How does it handle non-null exclamation marks (!)?
Fields with a non-null modifier (such as id: ID!) are automatically mapped to the JSON Schema object's required array. Optional fields without ! are omitted from required.
Where are secondary types and enums stored in the schema?
When using Draft 2020-12, secondary types, inputs, and enums are registered in the $defs dictionary. When using Draft-07, they are registered under definitions.
How are GraphQL unions converted?
GraphQL unions (e.g. union SearchResult = User | Post) are converted into anyOf arrays referencing each member definition in $defs or definitions.

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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