Process API call in Controller

gistfile1.groovy

def list = {
    def domainNameInPluralForm = params.domainInPlural
    def domainName = retrieveDomainName(domainNameInPluralForm)
    def entity = grailsApplication.getArtefacts("Domain").find {
        it.getShortName() == domainName
    }?.clazz

    def result = entity.list(params)
    def converter = [domainNameInPluralForm:result] as JSON
    
    render text: converter.toString(), contentType: 'application/json'
}