diff --git a/application/Mapping/GenderMapping.php b/application/Mapping/GenderMapping.php
new file mode 100644
index 0000000..e7385b2
--- /dev/null
+++ b/application/Mapping/GenderMapping.php
@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * GenderMapping for tests.
+ */
+return [
+    'id' => [
+        'column' => 'GenderID'
+    ],
+    'label' => [
+        'validation' => [
+            'required',
+        ]
+    ],
+];
diff --git a/application/Mapping/UserMapping.php b/application/Mapping/UserMapping.php
new file mode 100644
index 0000000..ebe7abe
--- /dev/null
+++ b/application/Mapping/UserMapping.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * UserMapping for tests.
+ */
+return [
+    'id' => [
+        'column' => 'UserID'
+    ],
+    'firstname' => [
+        'validation' => [
+            'required',
+            'size' => ['max' => 15]
+        ]
+    ],
+    'lastname' => [],
+    'hobbies' => [
+        'form' => [
+            'type' => 'textarea'
+        ]
+    ],
+    'genderID' => [
+        'column' => 'GenderID',
+        'form' => [
+            'type' => 'select',
+            'options' => ['1' => 'male', '2' => 'female', '3' => 'other'],
+            'label' => 'Choose gender'
+        ]
+    ],
+    'Gender' => [
+        'column' => 'GenderID',
+        'type' => 'Gender',
+        'form' => [
+            'hidden' => true
+        ]
+    ]
+];
diff --git a/src/Orm/Entity.php b/src/Orm/Entity.php
index 529e6da..45abe05 100644
--- a/src/Orm/Entity.php
+++ b/src/Orm/Entity.php
@@ -298,4 +298,45 @@ public function validate(): bool
 
         return $this->isValid();
     }
-}
\ No newline at end of file
+
+    /**
+     * toArray
+     * 
+     * Converts the Entity to an array.
+     * 
+     * @param bool $includeEntities Whether to include entity-type properties or not.
+     *
+     * @return array
+     */
+    public function toArray($includeEntities = false): array
+    {
+        $array = [];
+        foreach ($this->EntityMapping as $property => $value) {
+            if (!$value['isEntity']) {
+                $array[$property] = $this->$property ?? null;
+            } elseif ($includeEntities) {
+                if (!isset($this->$property)) {
+                    $array[$property] = null;
+                } else {
+                    $array[$property] = $this->$property->toArray();
+                }
+            }
+        }
+        return $array;
+    }
+
+    /**
+     * toJSON
+     * 
+     * Converts the Entity to JSON.
+     * 
+     * @param bool $includeEntities Whether to include entity-type properties or not.
+     *
+     * @return array
+     */
+    public function toJSON($includeEntities = false): string
+    {
+        $array = $this->toArray($includeEntities);
+        return json_encode($array);
+    }
+}
diff --git a/src/Orm/EntityCollection.php b/src/Orm/EntityCollection.php
index d7b519d..333e775 100644
--- a/src/Orm/EntityCollection.php
+++ b/src/Orm/EntityCollection.php
@@ -345,4 +345,34 @@ public function where(string $condition): EntityCollection
 
 		return $this;
 	}
+
+	/**
+	 * toArray
+	 *
+	 * Returns all previously loaded Entities of the EntityCollection as an array.
+	 *
+	 * @return array All entities previously loaded as an array.
+	 */
+    public function toArray($includeEntities = false): array
+    {
+		$all = $this->getAll();
+		$array = [];
+		foreach ($all as $entity) {
+			$array[] = $entity->toArray($includeEntities);
+		}
+		return $array;
+	}
+
+	/**
+	 * toJSON
+	 *
+	 * Returns all previously loaded Entities of the EntityCollection as a JSON string.
+	 *
+	 * @return array All entities previously loaded as a JSON string.
+	 */
+    public function toJSON($includeEntities = false): string
+    {
+		$array = $this->toArray($includeEntities);
+		return json_encode($array);
+	}
 }
diff --git a/tests/Orm/EntityTest.php b/tests/Orm/EntityTest.php
new file mode 100644
index 0000000..52b74ea
--- /dev/null
+++ b/tests/Orm/EntityTest.php
@@ -0,0 +1,174 @@
+<?php
+/**
+ * AVOLUTIONS
+ *
+ * Just another open source PHP framework.
+ *
+ * @copyright   Copyright (c) 2019 - 2021 AVOLUTIONS
+ * @license     MIT License (https://avolutions.org/license)
+ * @link        https://avolutions.org
+ */
+
+namespace {
+    use PHPUnit\Framework\TestCase;
+
+    use Application\Model\User;
+
+    class EntityTest extends TestCase
+    {
+        /**
+         * @var User
+         */
+        private $Entity;
+
+        protected function setUp(): void
+        {
+            // Create a new entity
+            $this->Entity = new User([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging',
+                'genderID' => 1,
+                'Gender' => [
+                    'id' => 1,
+                    'label' => 'male',
+                ],
+            ]);
+        }
+
+        public function testConvertEntityToArray()
+        {
+            // Convert entity to array
+            $array = $this->Entity->toArray();
+
+            $this->assertEquals([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging',
+                'genderID' => 1,
+            ], $array);
+
+            // Update entity properties
+            $this->Entity->hobbies = 'Blogging, Video Games';
+
+            $array = $this->Entity->toArray();
+            $this->assertEquals([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging, Video Games',
+                'genderID' => 1,
+            ], $array);
+        }
+
+        public function testConvertEntityIncludingEntityTypeProperties()
+        {
+            // Convert entity to array
+            $array = $this->Entity->toArray(true);
+
+            $this->assertEquals([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging',
+                'genderID' => 1,
+                'Gender' => [
+                    'id' => 1,
+                    'label' => 'male',
+                ],
+            ], $array);
+
+            // Update entity properties
+            $this->Entity->hobbies = 'Blogging, Video Games';
+
+            $array = $this->Entity->toArray(true);
+            $this->assertEquals([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging, Video Games',
+                'genderID' => 1,
+                'Gender' => [
+                    'id' => 1,
+                    'label' => 'male',
+                ],
+            ], $array);
+        }
+
+        public function testConvertEntityToJSON()
+        {
+            // Convert entity to JSON string
+            $json = $this->Entity->toJSON();
+
+            $this->assertEquals(json_encode([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging',
+                'genderID' => 1,
+            ]), $json);
+
+            // Update entity properties
+            $this->Entity->hobbies = 'Blogging, Video Games';
+
+            $json = $this->Entity->toJSON();
+            $this->assertEquals(json_encode([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging, Video Games',
+                'genderID' => 1,
+            ]), $json);
+        }
+
+        public function testConvertEntityToJSONIncludingEntityTypeProperties()
+        {
+            // Convert entity to JSON string
+            $json = $this->Entity->toJSON(true);
+
+            $this->assertEquals(json_encode([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging',
+                'genderID' => 1,
+                'Gender' => [
+                    'id' => 1,
+                    'label' => 'male',
+                ],
+            ]), $json);
+
+            // Update entity properties
+            $this->Entity->hobbies = 'Blogging, Video Games';
+
+            $json = $this->Entity->toJSON(true);
+            $this->assertEquals(json_encode([
+                'id' => 1,
+                'firstname' => 'John',
+                'lastname' => 'Doe',
+                'hobbies' => 'Blogging, Video Games',
+                'genderID' => 1,
+                'Gender' => [
+                    'id' => 1,
+                    'label' => 'male',
+                ],
+            ]), $json);
+        }
+    }
+}
+
+namespace Application\Model {
+    use Avolutions\Orm\Entity;
+
+    if (!\class_exists(User::class)) {
+        class User extends Entity
+        {
+        }
+    
+        class Gender extends Entity
+        {
+        }
+    }
+}