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JSON to GraphQL Schema Generator

Infer and generate complete GraphQL Schema Definition Language (SDL) types, queries, and mutations directly from sample JSON data.

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📐JSON to GraphQL Schema Generator Documentation & Guide

Web & Developer
Infer and generate complete GraphQL Schema Definition Language (SDL) types, queries, and mutations directly from sample JSON data. Automatically identifies ID fields, nested child models, primitive scalars (Int, Float, String, Boolean), and arrays.

📋How to Generate GraphQL SDL from JSON

  1. 1. Paste Sample JSON: Paste any valid JSON payload, API response, or select an example preset (User Profile, Product, Article).
  2. 2. Set Root Model Name: Define your top-level GraphQL type name (e.g. User, Product, Order) to anchor the schema hierarchy.
  3. 3. Choose Boilerplate Options: Select whether to generate types only, or append type Query and type Mutation operational contracts.
  4. 4. Generate & Copy Schema: Click 📐 Generate GraphQL Schema to inspect the synthesized SDL and copy it to your backend codebase.

⚙️Recursive Type Derivation & Scalar Inference

Schema inference walks the structural JSON object graph to synthesize normalized GraphQL types:

• Scalar Disambiguation: Employs `Number.isInteger()` to distinguish between `Int` and `Float` scalars, and maps strings, booleans, and nulls to canonical GraphQL primitives.
• Semantic ID Resolution: Automatically maps keys matching `id`, `_id`, or ending in `Id` to the standard GraphQL `ID` scalar.
• Recursive Object Decomposition: Disassembles nested JSON objects into discrete named `type SubTypeName` definitions to prevent schema duplication.
• Non-Null Constraint Control: Configurable enforcement of exclamation marks (`!`) on non-null fields to establish strict backend type guarantees.

Pairs directly with the GraphQL SDL to TypeScript Converter for complete end-to-end type synchronization.

💡Practical Use Cases

  • GraphQL API Bootstrapping: Rapidly draft server-side GraphQL schemas from existing REST API JSON payloads.
  • Backend Migration: Transition legacy Node.js or Python REST backends to Apollo Server, Yoga, or Mercurius without writing types manually.
  • Full-Stack Prototyping: Scaffold frontend mock schemas for Apollo Client, Urql, and Relay during application planning.
100% Client-Side Privacy Guarantee:JSON traversal and GraphQL SDL synthesis execute entirely within your browser sandbox. Confidential data payloads and API responses are never uploaded to any server.
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