Hi there,
Thank you for contacting pdf.js express forums,
For the hyperlinks in the PDF, you can see them as an annotation, for example in the demo site: PDF.js Viewer Demo | PDF.js Express
And these are types of link annotations we support:
Please note that the above guide is for express Pro, and the Viewer does not support link annotations: Internal links don't work in PDF.js Express viewer - #3 by system
Best regards,
Kevin Kim