JSON to GraphQL Schema Generator

Generate GraphQL type definitions from JSON data samples. Perfect for building GraphQL APIs from existing data.

GraphQL schema will appear here...

What Is JSON to GraphQL Schema Generation?

GraphQL schemas define the types and fields available in your API. Writing them manually from existing JSON data is error-prone and tedious. This tool analyzes your JSON sample and automatically generates the corresponding GraphQL type definitions, inferring scalar types (String, Int, Float, Boolean) and nested object types.

How to Generate a GraphQL Schema from JSON

  1. Paste a representative JSON sample of your API response or data model.
  2. Click Generate Schema to produce GraphQL type definitions. The tool creates a type Root with fields matching your JSON keys and inferred types.
  3. Copy the schema into your GraphQL server's type definitions or use it as a starting point for further customization.

Frequently Asked Questions

Does it handle nested objects?

Yes. Nested JSON objects are converted into separate GraphQL types with appropriate field types and relationships.

What about arrays?

Arrays are converted to list types ([String], [Int], etc.) based on the type of the first array element.

Can I convert a GraphQL schema back to JSON?

Yes, use the Swap button to generate sample JSON data from a GraphQL schema definition.

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