GraphQL Schema to Java Converter
Paste a GraphQL SDL schema to instantly generate matching Java POJO classes and enums, with getters and setters stubbed out for every field. Free online developer tool.
Paste GraphQL Schema (SDL)
Java Classes
Java output will appear here...
Free GraphQL Schema to Java Converter
Paste a GraphQL SDL schema to instantly generate matching Java POJO classes and enums, with getters and setters stubbed out for every field.
How to Use It
Paste your GraphQL schema definition language (SDL) into the input box, or click "Load Example" to see a sample run. The tool builds a real schema with GraphQL.js, then walks every object, interface, and input type into a plain Java class with private fields plus public getters and setters, and every enum into a real Java enum. Scalars map onto boxed Java types (String, Integer, Double, Boolean), and list types become List<T>.
Example
A Post type with id: ID! and title: String! generates a public class Post with private String id; and private String title;, plus matching getId()/setId() and getTitle()/setTitle() methods.
Common Use Cases
- Bootstrapping Java DTOs for a GraphQL client or server implementation on the JVM.
- Speeding up manual POJO authoring when adopting a GraphQL schema in a Java codebase.
- Reviewing how a schema's types would map onto a statically typed, object-oriented language.
- Generating a starting point for graphql-java resolver return types.
FAQs
Are GraphQL non-null and list rules reflected in the Java output?
List types become List<T> regardless of nullability, since Java has no built-in non-null type annotation without an extra dependency — the tool keeps the generated classes simple and lets you add validation or @NonNull annotations yourself where needed.
How are custom scalars handled?
Any scalar beyond the five built-ins (String, Int, Float,Boolean, ID) maps to Java's Object as a safe fallback — replace it with your actual scalar's Java representation by hand.
Is my schema uploaded anywhere?
No — parsing and code generation happen entirely client-side in your browser. Nothing you paste is sent to a server.