JSON has JSON Object Signing and Encryption (JOSE), compare that to XML-Dsig and XML-Enc. It has OpenAPI/Swagger, which is close to SOAP/WSDL. It has JSON-Schem

JSON has JSON Object Signing and Encryption (JOSE), compare that to XML-Dsig and XML-Enc. It has OpenAPI/Swagger, which is close to SOAP/WSDL. It has JSON-Schema, which is close to XML-Schema. It has OpenID Connect, which is literally SAML, but with JSON instead of XML. If you're missing anything out of WS-* in JSON, you can be sure somebody is working on a spec for it.