I recently updated to OJS 3.5 and PDF viewer stopped working. I can download PDFs but viewer is not working. I already tried to reinstall pdfJsViewer, adding MIME type application/javascript with an mjs extension, modifying the .htaccess file with Add Type codes, and nothing seems to work. I already…

I don’t have cpanel. Here is my .htaccess file, PDF is still not working. [Screen Shot 2025-11-16 at 10.11.36 a.m.] Also added to httpd.conf the following, with no results: [Screen Shot 2025-11-17 at 9.09.39 a.m.] I’ve tried everything and still not working. Please help

Hi @Ana , This is a web server configuration issue, and will depend on your host’s support e.g. for .htaccess files – I can’t give much guidance here. But to narrow the problem down, send your browser to the .mjs file directly, e.g.: http://[your host]/path/to/ojs/plugins/generic/pdfJsViewer/pdf.js…

What is weird it that I’m getting different results in Firefox and in Chrome. Firefox: [Screen Shot 2025-11-18 at 8.27.55 a.m.] Chrome: [Screen Shot 2025-11-18 at 8.30.09 a.m.] How can I configure my server correctly? I don’t know what I’m doing wrong. Please help.

A stupid idea is that the browser serves you the cached version of pdf.mjs with the wrong mime type even after you reconfigured the server (provided that everything’s configured right). This would explain the different results in different browsers. Have you tried clearing the cache or, e.g., incogn…

Hi all, :up_arrow: That’s not a stupid idea at all! Regards, Alec Smecher Public Knowledge Project Team

I think that was the problem. Thank you

PKP Community Forum

PDF viewer not working on OJS 3.5

Software Support

asmecher November 16, 2025, 2:42pm 2

Hi @Ana,

See e.g.: Articles not opening in browser - #8 by asmecher

Regards,
Alec Smecher
Public Knowledge Project Team