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JSON to GraphQL Schema Generator

Convert JSON objects and arrays into structured GraphQL Schema Definition Language (SDL) types with automatic type inference and query generation.

Root Type Name:
Include Sample Query Type:
Make Fields Non-Null (!):
Valid Syntax

Quick Answer & Understanding Your Result

Source: GraphQL Foundation - Official Specification (October 2021)

A JSON to GraphQL Schema Generator converts JSON payload objects and arrays into strongly typed GraphQL Schema Definition Language (SDL) types, automatically inferring scalar types (String, Int, Float, Boolean, ID), nested types, and root query definitions.

Core GraphQL Schema Generation Capabilities

  • Scalar & ID Type Inference: Automatically maps string identifiers (id, _id, userId) to ID, whole numbers to Int, floating decimals to Float, and text to String.
  • Recursive Nested Type Extraction: Extracts embedded objects (e.g. profile, address, variants) into standalone, modular GraphQL types.
  • List & Array Handling: Inferred lists (e.g. [Post] or [String]) are structured with proper list wrapper notation.
  • Sample Query Type Generation: Auto-generates standard type Query { get<Type>(id: ID!): <Type> } definitions for immediate API prototyping.

Formula & Calculation Logic

Technical Specification & AST
Mathematical Formula
GraphQL Schema
= AST(JSON) → type Root ... , type SubType ... , type Query ...

Type inference pipeline:

  • Traverses JSON tree, extracts scalar primitives and sub-objects, and maps them to GraphQL Schema Definition Language (SDL) types.

Step-by-Step Guide

1

Paste JSON Payload

Paste raw JSON response or object into the left code editor.

2

Configure Schema Options

Specify Root Type Name (e.g. User, Product) and toggle sample Query generation.

3

Deterministic SDL Generation

The engine parses and synthesizes clean GraphQL SDL in 0ms.

4

Copy GraphQL Schema

Click 1-Click Copy to grab the schema for Apollo Server or schema.graphql.

Worked Examples Table

ExampleInput ValuesCalculated ResultExplanation
User Profile with Nested Address
Input: { "id": 101, "name": "Alex Rivera", "isActive": true, "address": { "city": "San Francisco", "zipCode": "94107" } }, Root Type Name: User, Include Query: true, Non Null: false
type Address { city: String zipCode: String } type User { id: ID name: String isActive: Boolean address: Address } type Query { getUser(id: ID!): User listUsers: [User] }
Inferred scalar types and extracted nested Address type with sample Query.
E-Commerce Product with Variants & Pricing
Input: { "id": "prod_9921", "title": "Wireless Noise-Canceling Headphones", "price": 299.99, "inStock": true, "category": "Electronics", "tags": ["audio", "bluetooth", "wireless"], "dimensions": { "width": 18.5, "height": 20.0, "depth": 8.2 }, "variants": [ { "sku": "WH-1000XM5-BLK", "color": "Matte Black", "inventory": 45 }, { "sku": "WH-1000XM5-SLV", "color": "Platinum Silver", "inventory": 20 } ] }, Root Type Name: Product, Include Query: true, Non Null: false
Accurate Operational Result
Provides instant quantitative evaluation for comparative practical analysis.

Frequently Asked Questions

Evidence-Based Methodology & Authoritative References

References & Methodology

GraphQL Foundation - Official Specification (October 2021)

View Reference

Apollo GraphQL - Defining a Schema

View Reference
Calculation Standard & Formulation

Standard: ISO / W3C / IETF Authoritative Domain Standard

Formula: GraphQL Schema = AST(JSON) → type Root ... , type SubType ... , type Query ...

Last Reviewed: August 21, 2026

Authoritative Sources & Peer Review

Primary Source: GraphQL Foundation - Official Specification (October 2021)

Reference Document: Apollo GraphQL - Defining a Schema

Computation Privacy: 100% client-side 0ms computation, zero data retention

Technical Standards & Execution Scope

All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.

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