In php you use <?php ?> to execute php code inside an html doc. How do you do that in Nodejs
You should use template engine. See ejs, or jade for example.
If you are using Express nodejs framework, then it is very comfortable to use jade. There is also template engine called Bliss which is like Razor Engine in ASP.NET
if template engine is ejs then <%- nameofvariable %>
you can use the template jade useing express framework for nodejs. https://github.com/visionmedia/jade#readme