How to pass data from JS to Jade?

Question

JavaScript

Good afternoon.
Data in .json -> JS (XMLHttpRequest) -> Jade templates -> html ,
how to set up data transfer from JSON to Jade templates?
(without modules like gulp-jade-template, i.e. XMLHttpRequest is a required link in the chain)

There are examples in the Jade doc , but at a low level, all jade.anyMethod methods use fs methods, I have it installed and require( 'fs') via browserify to my js app, but any of its methods throw an error fs.anyMethod is not a functioneven though the IDE sees its methods. There is no need to emphasize the error, I am looking for an answer to the question of how it is possible to establish the above circuit, thanks!