RM REST endpoints generate malformed JSON

% curl 'http://localhost:8088/ws/v1/cluster/apps'
{"apps":{"app":[{"id":"application_1510777276702_0001","user":"daniel","name":"QuasiMonteCarlo","queue":"root.daniel","state":"RUNNING","finalStatus":"UNDEFINED","progress":5.0,"trackingUI":"ApplicationMaster","trackingUrl":"http://dhcp-10-16-0-181.pa.cloudera.com:8088/proxy/application_1510777276702_0001/","diagnostics":"","clusterId":1510777276702,"applicationType":"MAPREDUCE","applicationTags":"","priority":0,"startedTime":1510777317853,"finishedTime":0,"elapsedTime":21623,"amContainerLogs":"http://dhcp-10-16-0-181.pa.cloudera.com:8042/node/containerlogs/container_1510777276702_0001_01_000001/daniel","amHostHttpAddress":"dhcp-10-16-0-181.pa.cloudera.com:8042","amRPCAddress":"dhcp-10-16-0-181.pa.cloudera.com:63371","allocatedMB":5120,"allocatedVCores":4,"reservedMB":0,"reservedVCores":0,"runningContainers":4,"memorySeconds":49820,"vcoreSeconds":26,"queueUsagePercentage":62.5,"clusterUsagePercentage":62.5,"resourceSecondsMap":{"entry":{"key":"test2","value":"0"},"entry":{"key":"test","value":"0"},"entry":{"key":"memory-mb","value":"49820"},"entry":{"key":"vcores","value":"26"}},"preemptedResourceMB":0,"preemptedResourceVCores":0,"numNonAMContainerPreempted":0,"numAMContainerPreempted":0,"preemptedMemorySeconds":0,"preemptedVcoreSeconds":0,"preemptedResourceSecondsMap":{},"resourceRequests":[{"priority":20,"resourceName":"dhcp-10-16-0-181.pa.cloudera.com","capability":{"memory":1024,"vCores":1},"numContainers":8,"relaxLocality":true,"nodeLabelExpression":"","executionTypeRequest":{"executionType":"GUARANTEED","enforceExecutionType":true},"enforceExecutionType":false},{"priority":20,"resourceName":"/default-rack","capability":{"memory":1024,"vCores":1},"numContainers":8,"relaxLocality":true,"nodeLabelExpression":"","executionTypeRequest":{"executionType":"GUARANTEED","enforceExecutionType":true},"enforceExecutionType":false},{"priority":20,"resourceName":"*","capability":{"memory":1024,"vCores":1},"numContainers":8,"relaxLocality":true,"nodeLabelExpression":"","executionTypeRequest":{"executionType":"GUARANTEED","enforceExecutionType":true},"enforceExecutionType":false}],"logAggregationStatus":"DISABLED","unmanagedApplication":false,"amNodeLabelExpression":"","timeouts":{"timeout":[{"type":"LIFETIME","expiryTime":"UNLIMITED","remainingTimeInSeconds":-1}]}}]}}