Dev
Générateur de schéma GraphQL
A GraphQL schema generator turns a list of fields into a valid GraphQL type definition, saving you from writing the SDL boilerplate by hand. Enter a type name and your fields as name:Type pairs — id:ID!, name:String!, age:Int — and it returns a clean type block ready to drop into your schema. Backend developers use it to scaffold object types for an API, sketch a schema during design, and teach how GraphQL types are written. The type name is capitalised to follow convention, field names are cleaned to valid identifiers, and any field without a type defaults to String. Standard scalar types and non-null markers work as you would expect. Everything runs in your browser with nothing uploaded. Paste the output into your schema file and connect it to resolvers. It handles the repetitive formatting so you can focus on modelling your data and writing the logic behind it.
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Enter the GraphQL type name.
- List fields as name:Type pairs, separated by commas.
- Click Generate to produce the type definition.
- Paste it into your schema and wire up resolvers.
Use Cases
- •Scaffolding an object type for a GraphQL API
- •Sketching a schema quickly during API design
- •Converting a field list into valid GraphQL SDL
- •Teaching how GraphQL type definitions are structured
- •Saving boilerplate when defining several related types
Tips
- →Append an exclamation mark, like String!, to mark a field non-null.
- →Use list syntax such as [Comment!]! for array fields.
- →Capitalise type names to follow GraphQL convention.
- →Remember you still need resolvers to back the type.
FAQ
which graphql types can i use
Use any GraphQL type after the colon: scalars like ID, String, Int, Float, and Boolean, plus your own types and lists such as [Post!]!. Append an exclamation mark to mark a field non-null, exactly as you would in a hand-written schema.
does it generate resolvers too
No. It produces only the type definition, the SDL part of your schema. You still need to write resolvers that fetch the data for each field. The generator handles the structure so you can focus on the resolver logic.
how are field types defaulted
Any field you write without a colon defaults to the String scalar, and field names are cleaned to valid identifiers. Review the output to confirm nullability and types match your data before adding it to your schema.
What is GraphQL SDL?
SDL (Schema Definition Language) is GraphQL's human-readable syntax for describing a schema — the types, fields, queries, and mutations an API exposes — independent of any programming language. The generator produces schemas in SDL, so the output is the same format you would write in a .graphql file, ready for testing tooling, codegen, or learning how a schema is structured.
What is the difference between a query and a mutation type in a schema?
The Query type defines the read operations a client can request, while the Mutation type defines the writes (create, update, delete); both are special root types that are the entry points into the schema. The generator can include these root types alongside object types, so the schema it produces reflects how a real GraphQL API separates reading data from changing it.
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