📝 JSON Data Input
🔒All processing happens in your browser
📤 GraphQL Schema Output
// Paste JSON to generate GraphQL Schema
Pure Frontend · JSON to GraphQL Types · Smart Inference
Zero Dependencies · Works OfflineWriting 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.
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.
Quickly generate type definitions from REST API JSON responses to accelerate API migration.
Frontend devs generate schemas from mock data to share type definitions with backend teams.
Infer GraphQL types from sample JSON data to aid data model design.
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.
Auto-infers String, Int, Float, Boolean, ID, DateTime, nested objects, and arrays. Date strings become DateTime, 24-char hex strings become ID.
Recursively analyzed with independent GraphQL type definitions for each level.
First element type becomes the list element type, generating [Type!] format.
No. All processing happens in your browser.
Yes. Compliant with GraphQL spec, works with Apollo Server, graphql-js, etc.