Online reader script, where can I get it?

Question

PHP

Hello. There is an electronic library created in the Yukoz system. I'm thinking about embedding an online reader that would load book files from vps. Each book has links in fb2, epub, pdf and txt formats. All book files are in zip archives. Is there any script that would allow us to implement our plans?
In particular, it is desirable without the use of php, since it is very problematic to work with it inside Yukoz itself. As a last resort, of course, you can place the script on a VPS, and from there, somehow upload its result to the site, but apart from the iframe, I have no idea how this could be implemented.
The link was not thrown for advertising, some of the books there have an online reader from Litres, it is implemented through JS. Something like this is what I would like to find.

Answer 1

Something like this?
https://github.com/search?l=JavaScript&o=desc&q=fb...

Answer 2

You can use a service like: omnireader.ru