Generate GraphQL schema

Generate GraphQL SDL for object types, inputs, enums, and relationships.

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ToolGraphQL Schema Generator
Input
Output
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How it works

Entities and fields are serialized into SDL with type wrappers and optional descriptions. The output defines a contract but does not create resolvers or validate backing data.

  • Object and input types separate read and write shapes.
  • Explicit nullability communicates missing-value handling.

Worked example

Schema from User JSON
Generate a GraphQL schema from a sample user JSON object
Input
											{"id":1,"name":"Alice","email":"alice@example.com","active":true,"age":30}
Output
												# Generated GraphQL Schema

type Root {
  id: Int
  name: String
  email: String
  active: Boolean
  age: Int
}

type Query {
  root(id: ID!): Root
  roots(limit: Int, offset: Int): [Root!]!
}

When to use this

Schema-first APIs, mock servers, and versioned documentation generate SDL.

Edge cases

  • List and item nullability are independent.
  • Circular references are legal but affect client traversal.
  • Duplicate type or field names invalidate SDL.

References