diff --git a/src/js/app.js b/src/js/app.js
index a89f2fc..175e833 100644
--- a/src/js/app.js
+++ b/src/js/app.js
@@ -8,11 +8,22 @@ const port = 3000;
 const mongoClient = new MongoClient();
 
 app.get('/test', (request, response) => {
-    mongoClient.insert('test', {creationDate: new Date()}, () => {
-        mongoClient.find('test', {}, results => {
-            console.log(results);
-            response.send(JSON.stringify(results));
-        });
+    mongoClient.find('test', {}, results => {
+        response.json(results);
+    });
+});
+
+app.get('/test2', (request, response) => {
+    // mongoClient.insert('test', {address: 'localhost'}, (result) => {
+    //     response.json(result);
+    // });
+
+    // mongoClient.update('test', {_id: '5f54b1c0f4dca82b7ad825bc', address: '127.0.0.1', updated: new Date()}, (result) => {
+    //     response.json(result);
+    // });
+
+    mongoClient.delete('test', '5f54b6c52d9355311a4e68a0', () => {
+        response.status(200).send('Deleted');
     });
 });
 
diff --git a/src/js/mongoClient.js b/src/js/mongoClient.js
index df3ec58..1b60bf4 100644
--- a/src/js/mongoClient.js
+++ b/src/js/mongoClient.js
@@ -1,4 +1,5 @@
 const mongodb = require('mongodb');
+const ObjectID = require('mongodb').ObjectID;
 const assert = require('assert');
 
 const mongoConfig = {
@@ -21,7 +22,6 @@ class MongoClient {
         this.db.collection(collectionName).find(query).toArray()
             .then(results => {
                 console.log(`Entities ${collectionName} founded.`);
-                console.log(results);
                 callback(results);
             })
             .catch(error => console.error(error));
@@ -36,19 +36,19 @@ class MongoClient {
         });
     }
 
-    update(collectionName, entity, query, callback) {
-        this.db.collection(collectionName).update(query, entity, (error, result) => {
+    update(collectionName, entity, callback) {
+        this.db.collection(collectionName).save(entity, (error) => {
             assert.equal(null, error, `Unable to update ${collectionName} entity: ${error}.`);
             console.log(`Entity ${collectionName} updated.`);
-            callback(result);
+            callback();
         });
     }
 
     delete(collectionName, entityId, callback) {
-        this.db.collection(collectionName).deleteOne({id: entityId}, (error, result) => {
+        this.db.collection(collectionName).deleteOne({id: new ObjectID(entityId)}, (error) => {
             assert.equal(null, error, `Unable to delete ${collectionName} entity with id ${entityId}: ${error}.`);
             console.log(`Entity ${collectionName} with id ${entityId} deleted.`);
-            callback(result);
+            callback();
         });
     }
 }