diff --git a/src/core/ResourcesAPI.ts b/src/core/ResourcesAPI.ts
index 199e23c..a7d001a 100644
--- a/src/core/ResourcesAPI.ts
+++ b/src/core/ResourcesAPI.ts
@@ -211,7 +211,6 @@ export class ResourcesAPIBase {
     const collection = this.collectionName;
     let result = [];
     try {
-      let result = [];
       // check if all the required fields are present
       if (this.requiredFields) {
         const requiredFieldsResult = this.checkRequiredFields(
@@ -239,7 +238,7 @@ export class ResourcesAPIBase {
         await this.db.addVertexCollection(collection);
         let createVertexResp = await this.db.createVertex(collection, documents);
         for (let document of documents) {
-          if (this.edgeCfg && _.isArray(this.edgeCfg) && this.edgeCfg.length > 0) {
+          if (this.edgeCfg && Array.isArray(this.edgeCfg) && this.edgeCfg.length > 0) {
             for (let eachEdgeCfg of this.edgeCfg) {
               const fromIDkey = eachEdgeCfg.from;
               const from_id = document[fromIDkey];
@@ -254,7 +253,7 @@ export class ResourcesAPIBase {
                 toVerticeName = collection;
               }
               if (from_id && to_id) {
-                if (_.isArray(to_id)) {
+                if (Array.isArray(to_id)) {
                   for (let toID of to_id) {
                     await this.db.createEdge(eachEdgeCfg.edgeName, null,
                       `${fromVerticeName}/${from_id}`, `${toVerticeName}/${toID}`);
@@ -267,7 +266,7 @@ export class ResourcesAPIBase {
             }
           }
         }
-        if (_.isArray(createVertexResp)) {
+        if (Array.isArray(createVertexResp)) {
           createVertexResp.forEach((eachVertexResp) => result.push(eachVertexResp));
         } else {
           result.push(createVertexResp);
@@ -314,26 +313,18 @@ export class ResourcesAPIBase {
    * @param requiredFields
    * @param documents
    */
-  checkRequiredFields(requiredFields: string[], documents: any, result: any[]): any {
-    documents.forEach((document) => {
-      requiredFields.forEach((eachField) => {
-        const isArray = _.isArray(eachField);
-        if (!document[eachField]) {
+  checkRequiredFields(requiredFields: string[], documents: any[], result: any[]): any {
+    documents = documents.filter((document) => {
+      return requiredFields.every((eachField) => {
+        if (document[eachField] === undefined || (Array.isArray(document[eachField]) && document[eachField].length === 0)) {
           result.push({
             error: true,
             errorNum: 400,
             errorMessage: `Field ${eachField} is necessary for ${this.resourceName} for documentID ${document.id}`
           });
-          documents = documents.filter(doc => doc.id != document.id);
-        }
-        if ((isArray && document[eachField].length == 0)) {
-          result.push({
-            error: true,
-            errorNum: 400,
-            errorMessage: `Field ${eachField} is necessary for ${this.resourceName} for documentID ${document.id}`
-          });
-          documents = documents.filter(doc => doc.id != document.id);
+          return false;
         }
+        return true;
       });
     });
     return { documents, result };
@@ -347,7 +338,7 @@ export class ResourcesAPIBase {
   async delete(ids: string[]): Promise<any> {
     let deleteResponse = [];
     try {
-      if (!_.isArray(ids)) {
+      if (!Array.isArray(ids)) {
         ids = [ids];
       }
       if (this.isGraphDB(this.db)) {
@@ -510,10 +501,10 @@ export class ResourcesAPIBase {
             const toIDkey = eachEdgeCfg.to;
             let modified_to_idValues = doc[toIDkey];
             let db_to_idValues = dbDoc[toIDkey];
-            if (_.isArray(modified_to_idValues)) {
+            if (Array.isArray(modified_to_idValues)) {
               modified_to_idValues = _.sortBy(modified_to_idValues);
             }
-            if (_.isArray(db_to_idValues)) {
+            if (Array.isArray(db_to_idValues)) {
               db_to_idValues = _.sortBy(db_to_idValues);
             }
             // delete and recreate only if there is a difference in references
@@ -531,16 +522,16 @@ export class ResourcesAPIBase {
 
               const edgeCollectionName = eachEdgeCfg.edgeName;
               let outgoingEdges: any = await db.getOutEdges(edgeCollectionName, `${collectionName}/${dbDoc.id}`);
-              if (_.isArray(outgoingEdges.edges)) {
+              if (Array.isArray(outgoingEdges.edges)) {
                 await Promise.all(outgoingEdges.edges.map((outgoingEdge) => db.removeEdge(edgeCollectionName, outgoingEdge._id)));
               }
               let incomingEdges: any = await db.getInEdges(edgeCollectionName, `${collectionName}/${dbDoc.id}`);
-              if (_.isArray(incomingEdges.edges)) {
+              if (Array.isArray(incomingEdges.edges)) {
                 await Promise.all(incomingEdges.edges.map((incomingEdge) => db.removeEdge(edgeCollectionName, incomingEdge._id)));
               }
               // Create new edges
               if (from_id && modified_to_idValues) {
-                if (_.isArray(modified_to_idValues)) {
+                if (Array.isArray(modified_to_idValues)) {
                   await Promise.all(modified_to_idValues.map((toID) => db.createEdge(eachEdgeCfg.edgeName, null,
                     `${fromVerticeName}/${from_id}`, `${toVerticeName}/${toID}`)));
                 } else {
diff --git a/src/core/ServiceBase.ts b/src/core/ServiceBase.ts
index 30f1161..56a57ea 100644
--- a/src/core/ServiceBase.ts
+++ b/src/core/ServiceBase.ts
@@ -231,7 +231,7 @@ export class ServiceBase<T extends ResourceListResponse, M extends ResourceList>
     let docs: any = {};
     try {
       const createDocs = _.cloneDeep(request.items);
-      let createResponse = await this.resourceapi.create(createDocs, request.subject);
+      const createResponse = await this.resourceapi.create(createDocs, request.subject);
       const dispatch = [];
       const events: Topic = this.events;
       if (this.isEventsEnabled) {
@@ -242,7 +242,7 @@ export class ServiceBase<T extends ResourceListResponse, M extends ResourceList>
         });
         await Promise.all(dispatch);
       }
-      let createResponseWithStatus = this.generateResponseWithStatus(createResponse, createDocs);
+      const createResponseWithStatus = this.generateResponseWithStatus(createResponse, createDocs);
       const operation_status = {
         code: 200,
         message: 'success'
diff --git a/test/cfg/config.json b/test/cfg/config.json
index 2e66e07..3e97ede 100644
--- a/test/cfg/config.json
+++ b/test/cfg/config.json
@@ -80,13 +80,13 @@
   },
   "client": {
     "test": {
-      "address": "localhost:50051"
+      "address": "localhost:50151"
     },
     "testBufferedService": {
-      "address": "localhost:50052"
+      "address": "localhost:50152"
     },
     "graphsTestService": {
-      "address": "localhost:50051"
+      "address": "localhost:50151"
     }
   },
   "events": {
@@ -180,7 +180,7 @@
       {
         "name": "pipeline",
         "provider": "grpc",
-        "addr": "localhost:50051"
+        "addr": "localhost:50151"
       }
     ]
   },
@@ -250,7 +250,7 @@
       {
         "name": "pipeline",
         "provider": "grpc",
-        "addr": "localhost:50052"
+        "addr": "localhost:50152"
       }
     ]
   },
@@ -263,7 +263,7 @@
     "timeStampFields": [
       {
         "fields": ["created", "meta.created", "meta.modified"],
-        "entities": ["resources"]
+        "entities": ["resource"]
       }
     ],
     "requiredFields": {
diff --git a/test/crud.spec.ts b/test/crud.spec.ts
index 8be23db..5a11293 100644
--- a/test/crud.spec.ts
+++ b/test/crud.spec.ts
@@ -234,7 +234,7 @@ describe('ServiceBase', () => {
     }
     resourceFieldConfig['timeStampFields'] = [];
     for (let timeStampFiledConfig of timeStampFieldsConfigs) {
-      if (timeStampFiledConfig.entities.includes(`${resourceName}s`)) {
+      if (timeStampFiledConfig.entities.includes(resourceName)) {
         resourceFieldConfig['timeStampFields'].push(...timeStampFiledConfig.fields);
       }
     }