script snippt to get slaves from jenkins to json format

jenkins_script_get_slaves.groovy

import hudson.model.Hudson.instance.slaves
import groovy.json.JsonOutput
def getSlaves() {
    slaves = []
    hudson.model.Hudson.instance.slaves.each{val->
        slave = [:]
        slave['name'] = val.getNodeName()
        slave['home_dir'] = val.getRemoteFS()
        launcher = val.getLauncher()
        slave['host'] = launcher.getHost()
        // not cloudbees ssh plugin
        // slave['port'] = launcher.getPort()
        // slave['credential'] = launcher.getCredentialsId()
        slave['credential'] = 'linux-root'
        slave['port'] = 22
        slave['nodeDescription'] = val.getNodeDescription()
        slave['numExecutors'] = val.getNumExecutors()
        slave['labelString'] = val.getLabelString()
        slave['mode'] = val.getMode().getName()
        // temparrly we undocumented here
        // slave['retentionStrategy'] = val.getRetentionStrategy()
        slaves.add(slave)
    }
    return JsonOutput.toJson(slaves)    
}
print(getSlaves())