chore: specify the route ID in the error message during development when making a form action request to a route without form actions (#13167)

closes #11876

Author: teemingc

.changeset/ninety-taxis-bathe.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+chore: specify the route ID in the error message during development when making a form action request to a route without form actions

packages/kit/src/runtime/server/page/actions.js

@@ -1,4 +1,5 @@
 import * as devalue from 'devalue';
+import { DEV } from 'esm-env';
 import { json } from '../../../exports/index.js';
 import { get_status, normalize_error } from '../../../utils/error.js';
 import { is_form_content_type, negotiate } from '../../../utils/http.js';
@@ -27,8 +28,9 @@ export async function handle_action_json_request(event, options, server) {
 		const no_actions_error = new SvelteKitError(
 			405,
 			'Method Not Allowed',
-			'POST method not allowed. No actions exist for this page'
+			`POST method not allowed. No form actions exist for ${DEV ? `the page at ${event.route.id}` : 'this page'}`
 		);
+
 		return action_json(
 			{
 				type: 'error',
@@ -153,7 +155,7 @@ export async function handle_action_request(event, server) {
 			error: new SvelteKitError(
 				405,
 				'Method Not Allowed',
-				'POST method not allowed. No actions exist for this page'
+				`POST method not allowed. No form actions exist for ${DEV ? `the page at ${event.route.id}` : 'this page'}`
 			)
 		};
 	}

packages/kit/test/apps/basics/test/server.test.js

@@ -373,7 +373,9 @@ test.describe('Errors', () => {
 		expect(await res_json.json()).toEqual({
 			type: 'error',
 			error: {
-				message: 'POST method not allowed. No actions exist for this page (405 Method Not Allowed)'
+				message: process.env.DEV
+					? 'POST method not allowed. No form actions exist for the page at /errors/missing-actions (405 Method Not Allowed)'
+					: 'POST method not allowed. No form actions exist for this page (405 Method Not Allowed)'
 			}
 		});
 	});