What error is it returning?

i attached a screenshot. says it can't read undefined of "my" but that's not part of my code.

could be some error from minification, are you making sure to have nixpacks build and run your app with the same version of node that you developed the app with?

yups.

do you have any other suggestions?

Are you missing some service variables?

I am not.

incorrect build or start command?

could you elaborate? all the settings are the same as production. i only changed the code in my app.

Then it looks like your code has broken something.

My code run's fine in local and prod.

Unfortunately, that doesn't rule out a code or config issue. Please make sure you have the container's environment as close to your local environment as possible.

how do i do that? the configurations on the railway dashboard are exactly the same.

Then I'm not sure what else could it be besides a difference in the code.

Are you sure it's not the build process in the staging environment that railway setup?

You are in near full control of them, if there are issues in that regard it would point to a code or config issue.

ok thanks.