Is SSI currently working with nodejs projects?

[Teodor]

You can check the docs for what's being implemented in beta 4:

Creating template based pages and layout in Wappler with NodeJS

When creating a website usually you want to include common elements like header/menu and a footer on all you pages. This was possible until now using SSI (server side includes) but this technique requires you to add your SSI on every page you create. With the new template based pages you can setup a main layout, which includes all your common elements and use it to create your site pages. This way you don’t have to include SSI on all the pages you create, as they will just use what’s included…

More options and improvements coming in the next versions.