reverted:
--- b/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
+++ a/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
@@ -455,10 +455,7 @@
       'serial:medium' => 'serial',
       'serial:big' => 'bigserial',
       'serial:normal' => 'serial',
+      ];
-
-      'json:normal' => 'json',
-      'jsonb:normal' => 'jsonb',
-    ];
     return $map;
   }
 
diff -u b/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php b/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php
--- b/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php
@@ -306,8 +306,8 @@
         $this->schema->createTable('test_json', $table_specification);
 
         $this->connection->insert('test_json')
-         ->values(['test_field' => $insertData])
-         ->execute();
+          ->values(['test_field' => $insertData])
+          ->execute();
         $query = $this->connection->select('test_json')
           ->addExpression($selectField, NULL, $selectPlaceholder)
           ->range(0, 1);