AngularJS with Express Templates or pure HTML? Pros and Cons?

This is very much an opinion question and Stack Overflow admins hate anything that smacks of opinion, but here's my experience and opinion nevertheless.

I've done a couple of apps now using purely static files (HTML, CSS, and JavaScript) with those calling a service on the back-end to deliver the data. It reduces the back-end, whatever it is (I've used both Java and Node.js), to just being a set of service URLs but it works very very well.

• You've got a fantastic hard line between the responsibilities of thetwo systems
• It's very easy to work on and test each one independently
• Bugs are usually very clearly in the front-end or the back-end (allyou have to do is look at the data transferred to know)
• The back-end services are ready to be reused to support alternative UIs from thecommand line or something mobile specific if you want
• You can use one technology for the back-end to start with (say Node.js or Ruby on Rails) and then switch to something else later if you need to. As long as the API stays the same the front-end never knows.

I personally use AngularJS with Express/Jade. The setup is actually pretty simple and I find writing Jade much more enjoyable than writing HTML. I've also adopted writing my Angular code in CoffeeScript as, again, it makes for quicker development. If you are looking to save keystrokes then Jade is a great solution and its integration with Express makes it a no brainer. If you aren't worried about producing code more quickly then there is absolutely no problem with using HTML.

I will point out that one of the greatest benefits I have found to using Jade over HTML is the ability to develop a single page in multiple files, then use include to have them concated before compiling into HTML. This allows you to take larger pages and break them into more manageable chunks. Together with Angular's templating, this can relieve much frustration.

Really it is all a matter of opinion, but since I decided to give Jade a shot, I have not regretted it and I have never ran into a situation where my HTML was rendered incorrectly when using Angular.

I went with option 1 because I didn't want to deal with any potential issues with jade or ejs converting the template incorrectly and interfering with Angular. My app essentially has the index page (which is really just the basic page template with my css and js includes) come out of Express as jade and then angular takes it come there and all my angular templates are in a separate location than my jade template.