GraphQL Schema to JSON Schema Converter — Map SDL to Type Validation Trees
Convert GraphQL type definitions to JSON Schema draft-07 instantly. Paste any SDL with types, enums, unions, and inputs and get a valid JSON Schema with $ref links, required arrays, and enum constraints. 100% client-side and free.
How to Use GraphQL Schema to JSON Schema Converter — Map SDL to Type Validation Trees
How to Use the GraphQL to JSON Schema Converter
Step 1: Paste Your GraphQL SDL
Paste any GraphQL type definition into the input panel. Conversion happens instantly as you type.
Example input:
type Product {
id: ID!
name: String!
price: Float!
description: String
tags: [String!]!
}
Output:
{
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"Product": {
"type": "object",
"properties": {
"id": { "type": "string" },
"name": { "type": "string" },
"price": { "type": "number" },
"description": { "oneOf": [{ "type": "string" }, { "type": "null" }] },
"tags": { "type": "array", "items": { "type": "string" } }
},
"required": ["id", "name", "price", "tags"]
}
}
}
Step 2: Copy or Download
- Copy JSON Schema — copies the output to your clipboard
- Download — saves a
schema.jsonfile
How GraphQL Types Map to JSON Schema
| GraphQL | JSON Schema |
|---|---|
String, ID | { "type": "string" } |
Int | { "type": "integer" } |
Float | { "type": "number" } |
Boolean | { "type": "boolean" } |
FieldName! (non-null) | Added to required array |
FieldName (nullable) | Wrapped in oneOf: [..., { type: "null" }] |
[Type!]! (list) | { "type": "array", "items": ... } |
enum Foo { A B } | { "type": "string", "enum": ["A", "B"] } |
union Foo = A | B | { "oneOf": [{ "$ref": "..." }, ...] } |
| Custom type reference | { "$ref": "#/definitions/TypeName" } |
scalar Foo | { "type": "string", "description": "Custom scalar" } |
Tips
- All types in the SDL (including
Query,Mutation,interface,input) are converted to definitions - Custom scalars become
{ "type": "string" }— update the output if you need a more specific constraint - The tool works entirely in your browser — safe for proprietary API schemas
Frequently Asked Questions
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