Strange behavious with length() function

Setup: Node/ docker/ development server

Not reporting as but as I suspect the issue lies elsewhere
Length() returns value in app connect mode

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but not shown in browser (error seen in dev tools)

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See video

ALSO
I see the same is happening with count()
App Connect
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Browser
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Error

Formatter is present

Are you sure you uploaded everything to your server?

That was my first thought, missing js file but this is running locally on the internal wappler node server/ docker on localhost. I haven’t even deployed to a remote server yet

I have tried hitting deploy with no effect but I assume that this should not actually be be necessary when running totally on localhost?

Just deploying to production server on DO to see what happens, have noticed some minor differences between dev and production before with docker based projects. Will advise

Check if the dmxFormatter.js is included on the page and check in the network tab if it was loaded correctly.

Thanks @patrick, tracked down the issue.
dmxFormatter.js was included in the parent layout page but the directive in the content page directive “components=”{dmxFormatter:{}}" was missing.
Resaved again and it was added

Now working correctly, many thanks, you pointed me in the right direction