JSON Schema to GraphQL Schema Converter

Transform JSON Schema data models, definitions, and enums into standardized GraphQL SDL in your browser.

At a glance

JSON Schema to GraphQL Schema Converter transforms JSON Schema specifications (Draft-07 and 2020-12) into valid GraphQL SDL types, inputs, enums, and unions. It translates primitive types, arrays, required fields into non-null assertions (!), and resolves definitions into clean GraphQL schemas.

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

Compile JSON Schema data models (Draft-07 & 2020-12) directly into clean, standardized GraphQL SDL schemas in browser memory.

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

Why Use This JSON Schema to GraphQL Schema Converter?

100% Client-Side Privacy: Your JSON schemas and data topologies never leave your browser sandbox.
Dual Declaration Modes: Generate strongly typed GraphQL object types or GraphQL input types.
Clean Nullability Mapping: Automatically applies non-null exclamation marks (!) to required fields.
Definitions & Enums Extraction: Translates $defs and definitions into standalone types, enums, and unions.

How to Use JSON Schema to GraphQL Schema Converter

1

Paste JSON Schema

Enter or paste your JSON Schema definition (Draft-04 through Draft 2020-12) into the editor.

2

Configure GraphQL Options

Select object type or input type mode, and customize your root type name or indentation.

3

Copy or Download SDL

Review generated GraphQL SDL, copy to your clipboard, or export as a .graphql file.

JSON Schema to GraphQL SDL Type Generation

Converts UserProfile JSON Schema into a GraphQL object type with required non-null fields and generates a RoleEnum definition.

JSON Schema (Draft 2020-12) Source 
{
  "$schema": "https://json-schema.org/draft-2020-12/schema",
  "title": "UserProfile",
  "description": "User account record",
  "type": "object",
  "properties": {
    "id": { "type": "string" },
    "username": { "type": "string" },
    "role": { "type": "string", "enum": ["ADMIN", "MEMBER"] }
  },
  "required": ["id", "username", "role"]
}
Generated GraphQL SDL Processed 
"User account record"
type UserProfile {
  id: String!
  username: String!
  role: RoleEnum!
}

enum RoleEnum {
  ADMIN
  MEMBER
}

Technical Specifications & Engine Details

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

Are my JSON Schema files uploaded to an external server?
No. All schema parsing and GraphQL SDL transpilation run 100% in your local browser sandbox. Your data models and schemas never leave your device.
How are required properties handled?
Property keys listed in your JSON Schema required array are appended with the GraphQL non-null modifier (!). Properties not in required remain nullable.
Can it generate GraphQL input types?
Yes. You can switch the declaration type option from Object Type (type) to Input Type (input) to generate mutation argument schemas.
Does it support nested $defs and definitions?
Yes. Sub-schemas and enums defined in $defs or definitions are extracted into standalone secondary GraphQL types, enums, and unions.

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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