JSON to GraphQL Schema

What is JSON → GraphQL?

This tool converts a JSON object into GraphQL SDL type definitions, inferring field types (String, Int, Float, Boolean) and generating nested types for nested objects.

How it works

The tool walks the JSON object, maps each value to a GraphQL scalar type, and generates separate type definitions for nested objects. All processing is local.

1. Paste JSON. Paste a JSON object.
2. Configure. Set the root type name and nullability preference.
3. Copy. Copy the generated GraphQL schema.

Examples

API response to schema

Convert {id:1,name:"Alice"} into a type Root { id: Int!, name: String! }.

Common mistakes

Passing an array

The input must be a single JSON object, not an array.

Alternatives

Manual schema writing

Write the GraphQL schema by hand for full control.

Frequently asked questions