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
new file mode 100644
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--- /dev/null
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/util/OpenstackUtil.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.openstacknetworking.util;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.openstack4j.core.transport.ObjectMapperSingleton;
+import org.openstack4j.model.ModelEntity;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.InputStream;
+
+import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+
+/**
+ * An utility that used in openstack networking app.
+ */
+public final class OpenstackUtil {
+
+    protected static final Logger log = LoggerFactory.getLogger(OpenstackUtil.class);
+
+    /**
+     * Prevents object instantiation from external.
+     */
+    private OpenstackUtil() {
+    }
+
+    /**
+     * Interprets JSON string to corresponding openstack model entity object.
+     *
+     * @param input JSON string
+     * @param entityClazz openstack model entity class
+     * @return openstack model entity object
+     */
+    public static ModelEntity jsonToModelEntity(InputStream input, Class entityClazz) {
+        ObjectMapper mapper = new ObjectMapper();
+        try {
+            JsonNode jsonTree = mapper.enable(INDENT_OUTPUT).readTree(input);
+            log.trace(new ObjectMapper().writeValueAsString(jsonTree));
+            return ObjectMapperSingleton.getContext(entityClazz)
+                    .readerFor(entityClazz)
+                    .readValue(jsonTree);
+        } catch (Exception e) {
+            throw new IllegalArgumentException();
+        }
+    }
+}