diff --git a/go/operation/list_masters.go b/go/operation/list_masters.go
index ade975c71..491c79f20 100644
--- a/go/operation/list_masters.go
+++ b/go/operation/list_masters.go
@@ -7,9 +7,9 @@ import (
 )
 
 type ClusterStatusResult struct {
-	IsLeader bool
-	Leader   string
-	Peers    []string
+	IsLeader bool     `json:"IsLeader,omitempty"`
+	Leader   string   `json:"Leader,omitempty"`
+	Peers    []string `json:"Peers,omitempty"`
 }
 
 func ListMasters(server string) ([]string, error) {
diff --git a/go/weed/weed_server/master_server_handlers.go b/go/weed/weed_server/master_server_handlers.go
index cc83a748f..1b58e6e73 100644
--- a/go/weed/weed_server/master_server_handlers.go
+++ b/go/weed/weed_server/master_server_handlers.go
@@ -74,21 +74,21 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 	option, err := ms.getVolumeGrowOption(r)
 	if err != nil {
 		w.WriteHeader(http.StatusNotAcceptable)
-		writeJsonQuiet(w, r, AssignResult{Error: err.Error()})
+		writeJsonQuiet(w, r, operation.AssignResult{Error: err.Error()})
 		return
 	}
 
 	if !ms.Topo.HasWriableVolume(option) {
 		if ms.Topo.FreeSpace() <= 0 {
 			w.WriteHeader(http.StatusNotFound)
-			writeJsonQuiet(w, r, AssignResult{Error: "No free volumes left!"})
+			writeJsonQuiet(w, r, operation.AssignResult{Error: "No free volumes left!"})
 			return
 		} else {
 			ms.vgLock.Lock()
 			defer ms.vgLock.Unlock()
 			if !ms.Topo.HasWriableVolume(option) {
 				if _, err = ms.vg.AutomaticGrowByType(option, ms.Topo); err != nil {
-					writeJsonQuiet(w, r, AssignResult{Error: "Cannot grow volume group! " + err.Error()})
+					writeJsonQuiet(w, r, operation.AssignResult{Error: "Cannot grow volume group! " + err.Error()})
 					return
 				}
 			}
@@ -96,9 +96,9 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 	}
 	fid, count, dn, err := ms.Topo.PickForWrite(requestedCount, option)
 	if err == nil {
-		writeJsonQuiet(w, r, AssignResult{Fid: fid, Url: dn.Url(), PublicUrl: dn.PublicUrl, Count: count})
+		writeJsonQuiet(w, r, operation.AssignResult{Fid: fid, Url: dn.Url(), PublicUrl: dn.PublicUrl, Count: count})
 	} else {
 		w.WriteHeader(http.StatusNotAcceptable)
-		writeJsonQuiet(w, r, AssignResult{Error: err.Error()})
+		writeJsonQuiet(w, r, operation.AssignResult{Error: err.Error()})
 	}
 }
diff --git a/go/weed/weed_server/raft_server_handlers.go b/go/weed/weed_server/raft_server_handlers.go
index 66430fae7..6a3c58b29 100644
--- a/go/weed/weed_server/raft_server_handlers.go
+++ b/go/weed/weed_server/raft_server_handlers.go
@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"code.google.com/p/weed-fs/go/glog"
+	"code.google.com/p/weed-fs/go/operation"
 	"encoding/json"
 	"github.com/goraft/raft"
 	"io/ioutil"
@@ -51,13 +52,12 @@ func (s *RaftServer) redirectToLeader(w http.ResponseWriter, req *http.Request)
 }
 
 func (s *RaftServer) statusHandler(w http.ResponseWriter, r *http.Request) {
-	m := make(map[string]interface{})
-	m["IsLeader"] = s.topo.IsLeader()
-	if leader, e := s.topo.Leader(); e == nil {
-		m["Leader"] = leader
-	} else {
-		m["Leader"] = ""
+	ret := operation.ClusterStatusResult{
+		IsLeader: s.topo.IsLeader(),
+		Peers:    s.Peers(),
 	}
-	m["Peers"] = s.Peers()
-	writeJsonQuiet(w, r, m)
+	if leader, e := s.topo.Leader(); e == nil {
+		ret.Leader = leader
+	}
+	writeJsonQuiet(w, r, ret)
 }