Hi @Nathan Hobbs ,

The issue is that the return inside the nested .then() only returns from that callback. Also, cache.match() gives you a Response object, so you need response.text() to retrieve the filename.

You can handle this directly in a JavaScript node using $resolve() and $reject(), without needing await. Set the output through $parameters before calling $resolve().

Documentation link: Defining Asynchronous JavaScript Code - OutSystems 11 Documentation

You can test this approach with the following code.

Writing to the cache:

• caches.open("my-cache")
•     .then(function (cache) {
•         return cache.put(
•             new Request("filename_777"),
•             new Response("test-image.png")
•         );
•     })
•     .then(function () {
•         $resolve();
•     })
•     .catch(function (error) {
•         $reject(error);
•     });

Reading from the cache:

• caches.open("my-cache")
•     .then(function (cache) {
•         return cache.match(
•             new Request("filename_777 )
•         );
•     })
•     .then(function (response) {
•         return response ? response.text() : "";
•     })
•     .then(function (filename) {
•         $parameters.Filename = filename;
•         $resolve();
•     })
•     .catch(function (error) {
•         $reject(error);
•     });

You can have each JS node in a different client action and call them from a button, and save the filename in a local variable for minimal testing. Also you can inspect the entry: F12 > Application > Cache Storage > my-cache .

If you need more help, it would be helpful to know the source of your images.