Convert GraphQL Schema to REST API Online Free

Each GraphQL type becomes a REST resource with standard CRUD endpoints. For example, a 'User' type generates /users (GET list), /users/{id} (GET single), POST /users (create), PUT /users/{id} (update), and DELETE /users/{id} (remove).

GraphQL queries become GET endpoints with query parameters for filtering and field selection. Nested queries create related resource endpoints like /users/{id}/posts for accessing user posts.

Mutations are mapped to appropriate HTTP methods: create operations become POST, update operations become PUT/PATCH, and delete operations become DELETE. Custom mutations are mapped based on their naming conventions.

Yes. GraphQL field arguments become query parameters for GET requests or request body parameters for POST/PUT requests. Complex input types are converted to request schemas.

GraphQL relationships become either embedded objects in REST responses or separate related resource endpoints. One-to-many relationships typically generate nested endpoints like /users/{id}/orders.

Yes. GraphQL unions and interfaces are converted to REST endpoints with polymorphic response schemas. Type discrimination is handled through response metadata or separate type-specific endpoints.

The conversion follows REST conventions automatically. GraphQL types become plural resource names (User → /users), and relationships follow standard nested patterns. Custom naming requires manual adjustment of the output.

Important directives are converted to appropriate REST metadata. @deprecated fields become deprecated in OpenAPI specs, authorization directives become security requirements, and validation directives become parameter constraints.

The output is an OpenAPI 3.0 specification in JSON format, including endpoint definitions, request/response schemas, parameter descriptions, and security requirements. This can be imported into Swagger UI or other API tools.

GraphQL subscriptions are converted to webhook endpoints or polling-based REST endpoints. Real-time subscriptions become webhook registration endpoints that push updates to registered callback URLs.

Yes. Federation directives are preserved as API metadata, and service boundaries are reflected in the endpoint organization. Related services may generate separate OpenAPI files or tagged endpoint groups.

The conversion captures the essential API structure, but some GraphQL-specific features like field-level queries and dynamic response shaping are simplified in REST. The output provides a solid foundation but may need manual refinement.