JSON to GraphQL Schema Converter

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Pure Frontend · JSON to GraphQL Types · Smart Inference

Zero Dependencies · Works Offline

📝 JSON Data Input

🔒All processing happens in your browser

📤 GraphQL Schema Output

// Paste JSON to generate GraphQL Schema

What Does the JSON to GraphQL Schema Converter Do?

Writing GraphQL type definitions manually from existing JSON data is tedious and error-prone. This tool auto-analyzes JSON structure, infers field types, and generates standard GraphQL Schema type definitions with smart type inference for nested objects, arrays, and dates. All conversion happens in your browser.

Core Features

Smart Type Inference: Auto-detects String/Int/Float/Boolean/ID/DateTime
Nested Object Support: Recursive generation of complete schemas
Array Type Handling: Infers list types from array elements
Name Conversion: Auto snake_case to PascalCase
Live Preview: Instant schema generation as you type

How to Use

Step 1: Paste JSON data — API responses, mock data, or config files.

Step 2: Tool auto-infers types and generates GraphQL Schema.

Step 3: Copy schema or download as .graphql file. Shortcuts: Ctrl+Enter, Ctrl+Shift+C.

Use Cases

GraphQL API Development

Quickly generate type definitions from REST API JSON responses to accelerate API migration.

Frontend-Backend Collaboration

Frontend devs generate schemas from mock data to share type definitions with backend teams.

Database Modeling

Infer GraphQL types from sample JSON data to aid data model design.

Extended Knowledge

GraphQL Type System: GraphQL uses a strong type system. Scalar types include Int, Float, String, Boolean, and ID. Custom scalars like DateTime need resolver definitions. Enums for finite option sets. Interfaces and union types for polymorphism.

FAQ

What type inference is supported?

Auto-infers String, Int, Float, Boolean, ID, DateTime, nested objects, and arrays. Date strings become DateTime, 24-char hex strings become ID.

How are nested objects handled?

Recursively analyzed with independent GraphQL type definitions for each level.

How are arrays inferred?

First element type becomes the list element type, generating [Type!] format.

Will my data be uploaded?

No. All processing happens in your browser.

Can the generated Schema be used directly?

Yes. Compliant with GraphQL spec, works with Apollo Server, graphql-js, etc.