diff --git a/src/JWT.php b/src/JWT.php
index 4de393c..cc02eb2 100644
--- a/src/JWT.php
+++ b/src/JWT.php
@@ -211,4 +211,15 @@ private static function b64encode(array $data): string
         }
         return rtrim(strtr(base64_encode($json), '+/', '-_'), '=');
     } // b64encode
+
+    public function __debugInfo(): array
+    {
+        return [
+            'headers' => $this->headers,
+            'claims' => $this->claims,
+            'signature' => isset($this->signature) ? $this->signature : '(not signed)',
+            'verified' => $this->is_verified,
+            'keyContainer' => isset($this->keys) ? '(set)' : '(not set)',
+        ];
+    }
 }
diff --git a/src/KeyContainer.php b/src/KeyContainer.php
index a65412b..d582b92 100644
--- a/src/KeyContainer.php
+++ b/src/KeyContainer.php
@@ -52,4 +52,14 @@ public function getKey($id = null): array
         list($alg, $secret) = $this->keys[$id];
         return [$alg, $secret, $id];
     }
+
+    public function __debugInfo(): array
+    {
+        return [
+            'keys' => array_values(array_map(function ($keyInfo, $id) {
+                return ['id' => $id, 'alg' => $keyInfo[0]];
+            }, $this->keys, array_keys($this->keys))),
+            'default' => $this->default,
+        ];
+    }
 }