diff --git a/packages/core/src/routes/logto-config.openapi.json b/packages/core/src/routes/logto-config.openapi.json
index 64fd081b7523..479d100d4e33 100644
--- a/packages/core/src/routes/logto-config.openapi.json
+++ b/packages/core/src/routes/logto-config.openapi.json
@@ -188,6 +188,55 @@
           }
         }
       }
+    },
+    "/api/configs/jwt-customizer/test": {
+      "post": {
+        "summary": "Test JWT customizer",
+        "description": "Test the JWT customizer script with the given context and token payload.",
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "properties": {
+                  "tokenType": {
+                    "description": "The token type to test the JWT customizer for."
+                  },
+                  "payload": {
+                    "properties": {
+                      "contextSample": {
+                        "description": "The sample context for the JWT customizer script testing purpose."
+                      },
+                      "tokenSample": {
+                        "description": "The sample token payload for the JWT customizer script testing purpose."
+                      },
+                      "envVars": {
+                        "description": "The environment variables for the JWT customizer."
+                      },
+                      "script": {
+                        "description": "The code snippet of the JWT customizer."
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "The result of the JWT customizer script."
+          },
+          "400": {
+            "description": "Zod errors in cloud service (data type does not match expectation, can be either request body or response body)."
+          },
+          "422": {
+            "description": "Cloud service syntax error."
+          },
+          "500": {
+            "description": "Cloud service internal error."
+          }
+        }
+      }
     }
   }
 }
diff --git a/packages/core/src/routes/logto-config.ts b/packages/core/src/routes/logto-config.ts
index 9dc6592cc647..32a491690e78 100644
--- a/packages/core/src/routes/logto-config.ts
+++ b/packages/core/src/routes/logto-config.ts
@@ -309,11 +309,6 @@ export default function logtoConfigRoutes<T extends AuthedRouter>(
         }),
       ]),
       response: jsonObjectGuard,
-      /**
-       * Code 400 indicates Zod errors in cloud service (data type does not match expectation, can be either request body or response body).
-       * Code 422 indicates syntax errors in cloud service.
-       * Code 500 indicates internal server errors in cloud service.
-       */
       status: [200, 400, 422, 500],
     }),
     async (ctx, next) => {