diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackFloatingIpListCommand.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackFloatingIpListCommand.java
index 66cd2ea..a2ef491 100644
--- a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackFloatingIpListCommand.java
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackFloatingIpListCommand.java
@@ -18,13 +18,11 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.base.Strings;
 import com.google.common.collect.Lists;
 import org.apache.karaf.shell.commands.Command;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.openstacknetworking.api.OpenstackRouterService;
-import org.openstack4j.core.transport.ObjectMapperSingleton;
 import org.openstack4j.model.network.NetFloatingIP;
 import org.openstack4j.openstack.networking.domain.NeutronFloatingIP;
 
@@ -32,6 +30,7 @@
 import java.util.List;
 
 import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+import static org.onosproject.openstacknetworking.util.OpenstackUtil.modelEntityToJson;
 
 /**
  * Lists OpenStack floating IP addresses.
@@ -69,20 +68,8 @@
     private JsonNode json(List<NetFloatingIP> floatingIps) {
         ArrayNode result = mapper().enable(INDENT_OUTPUT).createArrayNode();
         for (NetFloatingIP floatingIp: floatingIps) {
-            result.add(writeFloatingIp(floatingIp));
+            result.add(modelEntityToJson(floatingIp, NeutronFloatingIP.class));
         }
         return result;
     }
-
-    private ObjectNode writeFloatingIp(NetFloatingIP floatingIp) {
-        try {
-            String strFloatingIp = ObjectMapperSingleton.getContext(NeutronFloatingIP.class)
-                    .writerFor(NeutronFloatingIP.class)
-                    .writeValueAsString(floatingIp);
-            log.trace(strFloatingIp);
-            return (ObjectNode) mapper().readTree(strFloatingIp.getBytes());
-        } catch (Exception e) {
-            throw new IllegalStateException();
-        }
-    }
 }
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java
index 49483f1..401dddc 100644
--- a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackNetworkListCommand.java
@@ -18,12 +18,10 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.collect.Lists;
 import org.apache.karaf.shell.commands.Command;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
-import org.openstack4j.core.transport.ObjectMapperSingleton;
 import org.openstack4j.model.network.Network;
 import org.openstack4j.model.network.Subnet;
 import org.openstack4j.openstack.networking.domain.NeutronNetwork;
@@ -33,6 +31,7 @@
 import java.util.stream.Collectors;
 
 import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+import static org.onosproject.openstacknetworking.util.OpenstackUtil.modelEntityToJson;
 
 /**
  * Lists OpenStack networks.
@@ -75,19 +74,8 @@
     private JsonNode json(List<Network> networks) {
         ArrayNode result = mapper().enable(INDENT_OUTPUT).createArrayNode();
         for (Network net: networks) {
-            result.add(writeNetwork(net));
+            result.add(modelEntityToJson(net, NeutronNetwork.class));
         }
         return result;
     }
-
-    private ObjectNode writeNetwork(Network net) {
-        try {
-            String strNet = ObjectMapperSingleton.getContext(NeutronNetwork.class)
-                    .writerFor(NeutronNetwork.class)
-                    .writeValueAsString(net);
-            return (ObjectNode) mapper().readTree(strNet.getBytes());
-        } catch (Exception e) {
-            throw new IllegalStateException();
-        }
-    }
 }
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackPortListCommand.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackPortListCommand.java
index e59169c..aa38ffe 100644
--- a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackPortListCommand.java
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackPortListCommand.java
@@ -18,14 +18,12 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.base.Strings;
 import com.google.common.collect.Lists;
 import org.apache.karaf.shell.commands.Argument;
 import org.apache.karaf.shell.commands.Command;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
-import org.openstack4j.core.transport.ObjectMapperSingleton;
 import org.openstack4j.model.network.IP;
 import org.openstack4j.model.network.Network;
 import org.openstack4j.model.network.Port;
@@ -36,6 +34,7 @@
 import java.util.stream.Collectors;
 
 import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+import static org.onosproject.openstacknetworking.util.OpenstackUtil.modelEntityToJson;
 
 /**
  * Lists OpenStack ports.
@@ -85,19 +84,8 @@
     private JsonNode json(List<Port> ports) {
         ArrayNode result = mapper().enable(INDENT_OUTPUT).createArrayNode();
         for (Port port: ports) {
-            result.add(writePort(port));
+            result.add(modelEntityToJson(port, NeutronPort.class));
         }
         return result;
     }
-
-    private ObjectNode writePort(Port port) {
-        try {
-            String strPort = ObjectMapperSingleton.getContext(NeutronPort.class)
-                    .writerFor(NeutronPort.class)
-                    .writeValueAsString(port);
-            return (ObjectNode) mapper().readTree(strPort.getBytes());
-        } catch (Exception e) {
-            throw new IllegalStateException();
-        }
-    }
 }
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackRouterListCommand.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackRouterListCommand.java
index f72853e..772fa9b 100644
--- a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackRouterListCommand.java
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackRouterListCommand.java
@@ -18,13 +18,11 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.collect.Lists;
 import org.apache.karaf.shell.commands.Command;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
 import org.onosproject.openstacknetworking.api.OpenstackRouterService;
-import org.openstack4j.core.transport.ObjectMapperSingleton;
 import org.openstack4j.model.network.IP;
 import org.openstack4j.model.network.Port;
 import org.openstack4j.model.network.Router;
@@ -37,6 +35,7 @@
 import java.util.stream.Collectors;
 
 import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+import static org.onosproject.openstacknetworking.util.OpenstackUtil.modelEntityToJson;
 
 /**
  * Lists OpenStack routers.
@@ -100,19 +99,8 @@
     private JsonNode json(List<Router> routers) {
         ArrayNode result = mapper().enable(INDENT_OUTPUT).createArrayNode();
         for (Router router: routers) {
-            result.add(writeRouter(router));
+            result.add(modelEntityToJson(router, NeutronRouter.class));
         }
         return result;
     }
-
-    private ObjectNode writeRouter(Router osRouter) {
-        try {
-            String strNet = ObjectMapperSingleton.getContext(NeutronRouter.class)
-                    .writerFor(NeutronRouter.class)
-                    .writeValueAsString(osRouter);
-            return (ObjectNode) mapper().readTree(strNet.getBytes());
-        } catch (Exception e) {
-            throw new IllegalStateException();
-        }
-    }
 }
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackSecurityGroupListCommand.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackSecurityGroupListCommand.java
index 4cd216d..9342bca 100644
--- a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackSecurityGroupListCommand.java
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackSecurityGroupListCommand.java
@@ -18,13 +18,11 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.collect.Lists;
 import org.apache.karaf.shell.commands.Argument;
 import org.apache.karaf.shell.commands.Command;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.openstacknetworking.api.OpenstackSecurityGroupService;
-import org.openstack4j.core.transport.ObjectMapperSingleton;
 import org.openstack4j.model.network.SecurityGroup;
 import org.openstack4j.openstack.networking.domain.NeutronSecurityGroup;
 
@@ -32,6 +30,7 @@
 import java.util.List;
 
 import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+import static org.onosproject.openstacknetworking.util.OpenstackUtil.modelEntityToJson;
 
 /**
  * Lists OpenStack security groups.
@@ -72,19 +71,8 @@
     private JsonNode json(List<SecurityGroup> securityGroups) {
         ArrayNode result = mapper().enable(INDENT_OUTPUT).createArrayNode();
         for (SecurityGroup sg: securityGroups) {
-            result.add(writeSecurityGroup(sg));
+            result.add(modelEntityToJson(sg, NeutronSecurityGroup.class));
         }
         return result;
     }
-
-    private ObjectNode writeSecurityGroup(SecurityGroup sg) {
-        try {
-            String strSg = ObjectMapperSingleton.getContext(NeutronSecurityGroup.class)
-                    .writerFor(NeutronSecurityGroup.class)
-                    .writeValueAsString(sg);
-            return (ObjectNode) mapper().readTree(strSg.getBytes());
-        } catch (Exception e) {
-            throw new IllegalArgumentException();
-        }
-    }
 }
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/util/OpenstackUtil.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/util/OpenstackUtil.java
index ec976c4..5fee7cc 100644
--- a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/util/OpenstackUtil.java
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/util/OpenstackUtil.java
@@ -17,6 +17,7 @@
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import org.openstack4j.core.transport.ObjectMapperSingleton;
 import org.openstack4j.model.ModelEntity;
 import org.slf4j.Logger;
@@ -58,4 +59,24 @@
             throw new IllegalArgumentException();
         }
     }
+
+    /**
+     * Converts openstack model entity object into JSON object.
+     *
+     * @param entity openstack model entity object
+     * @param entityClazz openstack model entity class
+     * @return JSON object
+     */
+    public static ObjectNode modelEntityToJson(ModelEntity entity, Class entityClazz) {
+        ObjectMapper mapper = new ObjectMapper();
+        try {
+            String strModelEntity = ObjectMapperSingleton.getContext(entityClazz)
+                    .writerFor(entityClazz)
+                    .writeValueAsString(entity);
+            log.trace(strModelEntity);
+            return (ObjectNode) mapper.readTree(strModelEntity.getBytes());
+        } catch (Exception e) {
+            throw new IllegalStateException();
+        }
+    }
 }