What’s the Best URL Structure: Slugs and IDs?

Honestly, I think this decision is about user preference. The first one has better SEO implications since it avoids unnecessary directories, but some argue for semantic clarity in the second option. Maybe simplifying it further by dropping 'news' could make the URLs cleaner too.

If the reference number is essential, I’d say go with the second format. It allows you to change the slug without affecting the URL. This way, you can keep links intact even if you update your article titles.

I personally prefer the first format. The second option suggests that there could be more articles under '12345', which might not be the case. The first one feels cleaner and more straightforward for users sharing links.

The first option makes sense as the slug is mainly for human readability. Ideally, the URL should be functional even without the slug, so that both /news/12345-slug-here-blah-blah/2 and /news/12345/2 should work just fine. Just remember to set a canonical URL in your headers to avoid duplicate content issues. I also think using /news/12345-slug-here-blah-blah/page/2 makes it clearer that you’re on a different page.

It really depends on what the reference number signifies. If it's just an id for the article, then using /news/{id}/{slug}?page=1 might be more organized. But if you need older versions, consider a canonical URL that could help in browsing past versions.