diff --git a/src/Enum.php b/src/Enum.php
index 7b73b73..c73486b 100644
--- a/src/Enum.php
+++ b/src/Enum.php
@@ -5,6 +5,7 @@
 namespace IW;
 
 use InvalidArgumentException;
+use JsonSerializable;
 use ReflectionClass;
 use function array_keys;
 use function array_values;
@@ -53,7 +54,7 @@
  *   case Hash::SHA1: ...
  * }
  */
-abstract class Enum
+abstract class Enum implements JsonSerializable
 {
     /** @var string */
     private $key;
@@ -145,6 +146,16 @@ final public function getValue()
         return $this->value;
     }
 
+    /**
+     * Returns value for JSON serialization
+     *
+     * @return mixed
+     */
+    final public function jsonSerialize()
+    {
+        return $this->value;
+    }
+
     /**
      * Returns list of names of constants
      *
diff --git a/tests/EnumTest.php b/tests/EnumTest.php
index 0f87199..a0e6dd2 100644
--- a/tests/EnumTest.php
+++ b/tests/EnumTest.php
@@ -6,6 +6,7 @@
 
 use InvalidArgumentException;
 use PHPUnit\Framework\TestCase;
+use function json_encode;
 
 class EnumTest extends TestCase
 {
@@ -81,4 +82,11 @@ public function testMethodSearch() : void
         $this->assertSame(IntraWorldsEnum::NEW_YORK(), IntraWorldsEnum::search(42));
         $this->assertNull(IntraWorldsEnum::search(null));
     }
+
+    public function testJsonEncode() : void
+    {
+        $this->assertSame('true', json_encode(IntraWorldsEnum::PILSEN()));
+        $this->assertSame('0.3333333333333333', json_encode(IntraWorldsEnum::TAMPA()));
+        $this->assertSame('{"foo":["bar"]}', json_encode(IntraWorldsEnum::MUNICH()));
+    }
 }