diff --git a/src/Parameters.php b/src/Parameters.php
index d3cc999..5cae1c1 100644
--- a/src/Parameters.php
+++ b/src/Parameters.php
@@ -27,10 +27,23 @@ class Parameters
      */
     public static function json(string $name, object|array $document): array
     {
-        return [$name => match (is_object($document) && method_exists($document, 'toJson')) {
-            true  => $document->toJson(),
-            false => json_encode($document, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES)
-        }];
+        $flags = JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES;
+
+        if (is_object($document)) {
+            return [
+                $name => method_exists($document, 'toJson') ? $document->toJson($flags) : json_encode($document, $flags)
+            ];
+        }
+        if (empty($document)) return [$name => json_encode($document, $flags)];
+
+        $key = array_key_first($document);
+        if (is_array($document[$key]) && method_exists($document[$key][array_key_first($document[$key])], 'toJson')) {
+            return [
+                $name => sprintf('{%s:[%s]}', json_encode($key, $flags),
+                    implode(',', array_map(fn($it) => $it->toJson($flags), $document[$key])))
+            ];
+        }
+        return [$name => json_encode($document, $flags)];
     }
 
     /**
diff --git a/tests/unit/ParametersTest.php b/tests/unit/ParametersTest.php
index 03e7134..97685da 100644
--- a/tests/unit/ParametersTest.php
+++ b/tests/unit/ParametersTest.php
@@ -50,6 +50,13 @@ class ParametersTest extends TestCase
             'JSON parameter not constructed correctly');
     }
 
+    public function testJsonSucceedsForArrayOfPjsonClass(): void
+    {
+        $this->assertEquals([':it' => '{"pjson":[{"id":"997","name":"another test","num_value":94}]}'],
+            Parameters::json(':it',
+                ['pjson' => [new PjsonDocument(new PjsonId('997'), 'another test', 94, 'nothing')]]),
+            'JSON parameter not constructed correctly');
+    }
 
     public function testNameFieldsSucceeds(): void
     {