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OpenAPI Specification

The library includes support for the OpenAPI Specification.

Validating a request / response defined in an OpenAPI document

The library can be used to validate requests and responses with the use of the appropriate meta-schema.

Dialect Meta-schema
https://spec.openapis.org/oas/3.0/dialect com.networknt.schema.oas.OpenApi30.getInstance()
https://spec.openapis.org/oas/3.1/dialect/base com.networknt.schema.oas.OpenApi31.getInstance() 
JsonSchemaFactory factory = JsonSchemaFactory.getInstance(VersionFlag.V202012,
        builder -> builder.metaSchema(OpenApi31.getInstance())
                .defaultMetaSchemaIri(OpenApi31.getInstance().getIri()));
JsonSchema schema = factory.getSchema(SchemaLocation.of(
        "classpath:schema/oas/3.1/petstore.yaml#/components/schemas/PetRequest"));
String input = "{\r\n"
        + "  \"petType\": \"dog\",\r\n"
        + "  \"bark\": \"woof\"\r\n"
        + "}";
Set<ValidationMessage> messages = schema.validate(input, InputFormat.JSON);

Validating an OpenAPI document

The library can be used to validate OpenAPI documents, however the OpenAPI meta-schema documents are not bundled with the library.

It is recommended that the relevant meta-schema documents are placed in the classpath and are mapped otherwise they will be loaded over the internet.

The following are the documents required to validate a OpenAPI 3.1 document

  • https://spec.openapis.org/oas/3.1/schema-base/2022-10-07
  • https://spec.openapis.org/oas/3.1/schema/2022-10-07
  • https://spec.openapis.org/oas/3.1/dialect/base
  • https://spec.openapis.org/oas/3.1/meta/base
SchemaValidatorsConfig config = new SchemaValidatorsConfig();
config.setPathType(PathType.JSON_POINTER);
JsonSchema schema = JsonSchemaFactory
        .getInstance(VersionFlag.V202012,
                builder -> builder.schemaMappers(schemaMappers -> schemaMappers
                        .mapPrefix("https://spec.openapis.org/oas/3.1", "classpath:oas/3.1")))
        .getSchema(SchemaLocation.of("https://spec.openapis.org/oas/3.1/schema-base/2022-10-07"), config);
Set<ValidationMessage> messages = schema.validate(openApiDocument, InputFormat.JSON);