diff --git a/doc/json_schema.json b/doc/json_schema.json
index 5804b2292..419c0a74b 100644
--- a/doc/json_schema.json
+++ b/doc/json_schema.json
@@ -1117,6 +1117,9 @@
                                                 "maxItems": 2
                                             }
                                         }
+                                    },
+                                    "key": {
+                                        "$ref": "#/$defs/key"
                                     }
                                 }
                             },
@@ -1174,10 +1177,7 @@
                                         "description": "Text to print",
                                         "type": "string"
                                     }
-                                },
-                                "required": [
-                                    "format"
-                                ]
+                                }
                             },
                             {
                                 "title": "Display",
diff --git a/src/modules/custom/custom.c b/src/modules/custom/custom.c
index b68e19bb9..81e5aa416 100644
--- a/src/modules/custom/custom.c
+++ b/src/modules/custom/custom.c
@@ -6,12 +6,6 @@
 
 void ffPrintCustom(FFCustomOptions* options)
 {
-    if (options->moduleArgs.outputFormat.length == 0)
-    {
-        ffPrintError(FF_CUSTOM_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "output format must be set for custom module");
-        return;
-    }
-
     ffPrintLogoAndKey(FF_CUSTOM_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT);
     ffStrbufWriteTo(&options->moduleArgs.outputFormat, stdout);
     puts(FASTFETCH_TEXT_MODIFIER_RESET);