01
Paste or upload JSON
Add a JSON object or API response to the input panel. Use the sample button to load a realistic user and posts example.
GraphQL schema generator
JSON to GraphQL Schema Generator
Convert JSON objects and API responses into GraphQL type definitions instantly. Nested objects become separate types, id fields map to the ID scalar, and you can add a Query type with one click — all client-side with no upload needed.
100% client sideNested typesDownload .graphql
How to generate a GraphQL schema from JSON
Three steps02
Configure schema options
Toggle non-nullable fields, the ID scalar for id fields, an optional Query type, and rename the root type.
03
Copy or download schema
GraphQL types update live as you type. Copy the output or download a ready-to-use .graphql file.
Built for GraphQL developers
Bootstrap your GraphQL schema from existing REST API responses or JSON data models in seconds, then extend with resolvers and custom scalars.
100% client side
Your JSON never leaves the browser. No upload, no server, no logs.
Live generation
GraphQL types update instantly as you type or change options.
Nested types
Nested objects each get their own named type in PascalCase with all fields inferred.
Non-nullable control
Toggle the ! suffix on all fields to match your API's nullability requirements.
ID scalar
Fields named 'id' or ending in 'Id' are automatically mapped to the GraphQL ID scalar.
Download .graphql
Export a complete GraphQL schema file ready to use with Apollo or any GraphQL server.
Frequently asked questions
7 answersGraphQL Schema Generator from JSON Data
This tool infers GraphQL scalar types from JSON values: strings become String, integers become Int, floats become Float, and booleans become Boolean. Fields named id or ending in Id are mapped to the ID scalar. Nested objects generate separate named types in PascalCase. Arrays of objects produce list fields. All types are output in dependency order so nested types appear before the parent types that reference them. Download the result as a .graphql file to use directly with Apollo Server, GraphQL Yoga, or any schema-first GraphQL framework.