diff --git a/common/util/src/main/java/org/thingsboard/common/util/JacksonUtil.java b/common/util/src/main/java/org/thingsboard/common/util/JacksonUtil.java
index 18b7abb67e..5ccfbd1461 100644
--- a/common/util/src/main/java/org/thingsboard/common/util/JacksonUtil.java
+++ b/common/util/src/main/java/org/thingsboard/common/util/JacksonUtil.java
@@ -23,6 +23,8 @@ import com.fasterxml.jackson.databind.node.ObjectNode;
 
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Created by Valerii Sosliuk on 5/12/2017.
@@ -118,4 +120,25 @@ public class JacksonUtil {
     public static <T> JsonNode valueToTree(T value) {
         return OBJECT_MAPPER.valueToTree(value);
     }
+
+    public static String validateFieldsToTree(JsonNode nodeCredentialsValue, String[] fields, String delimiter) {
+        try {
+            Set msgSet = ConcurrentHashMap.newKeySet();
+            for (String field : fields) {
+                String[] keys = field.split(delimiter);
+                JsonNode nodeVal = nodeCredentialsValue;
+                for (String key : keys) {
+                    if (!nodeVal.hasNonNull(key)) {
+                        msgSet.add(keys[keys.length - 1]);
+                        break;
+                    } else {
+                        nodeVal = nodeVal.get(key);
+                    }
+                }
+            }
+            return String.join(", ", msgSet);
+        } catch (Exception e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
 }
diff --git a/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java b/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java
index 9d0ff83491..1974f970cc 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java
@@ -260,14 +260,14 @@ public class DeviceCredentialsServiceImpl extends AbstractEntityService implemen
 //            LwM2MCredentialsValid credentials = JacksonUtil.fromString(deviceCredentials.getCredentialsValue(), LwM2MCredentialsValid.class);
             JsonNode nodeCredentialsValue = JacksonUtil.toJsonNode(deviceCredentials.getCredentialsValue());
             String [] fields = {"client", "bootstrap", "bootstrap:bootstrapServer", "bootstrap:lwm2mServer"};
-            String validateMsg = validateNodeCredentials (nodeCredentialsValue,  fields);
+            String validateMsg = JacksonUtil.validateFieldsToTree(nodeCredentialsValue,  fields, ":");
             if (validateMsg.isEmpty()) {
                 checkClientKey(nodeCredentialsValue.get("client"));
                 checkServerKey(nodeCredentialsValue.get("bootstrap").get("bootstrapServer"), "Client`s by bootstrapServer");
                 checkServerKey(nodeCredentialsValue.get("bootstrap").get("lwm2mServer"), "Client`s by lwm2mServer");
             }
             else {
-                throw new DataValidationException(validateMsg);
+                throw new DataValidationException("Device credentials are missing fields or mandatory value in this fields: " + validateMsg);
             }
         } catch (DataValidationException | DecoderException e) {
             throw new DataValidationException(e.getMessage());
@@ -286,27 +286,6 @@ public class DeviceCredentialsServiceImpl extends AbstractEntityService implemen
         }
     }
 
-    private String validateNodeCredentials (JsonNode nodeCredentialsValue,  String [] fields) {
-        Set  msgSet = ConcurrentHashMap.newKeySet();
-        String msg = "";
-        for (String field : fields) {
-            if (field.contains(":")) {
-                String [] keys = field.split(":");
-                if (!nodeCredentialsValue.hasNonNull(keys[0])) {
-                    msgSet.add(keys[1]);
-                }
-                else {
-                    if (!nodeCredentialsValue.get(keys[0]).hasNonNull(keys[1])) msgSet.add(keys[1]);
-                }
-            }
-            else {
-                if (!nodeCredentialsValue.hasNonNull(field)) msgSet.add(field);
-            }
-        }
-        if (msgSet.size() > 0) msg = "Device credentials are missing fields or mandatory value in this fields: " + String.join(", ", msgSet);
-        return  msg;
-    }
-
     private void checkClientKey (JsonNode node) throws DataValidationException, DecoderException {
         String modeName = node.get("securityConfigClientMode").asText();
         // checks security config