US troops are given a cost of living allowance (COLA) while stationed in Germany. It is (or was while I was there) tied to the USD/Euro exchange rate. Even so, we always tried to avoid shopping "on the local economy" and stick to base facilities for groceries and such as much as possible.
- Social security is far better. You of course need to save for bad times, but getting sick will cost you practically nothing (you're always insured and the insurance will pay you 2/3rds of your wage) and when loosing your job (which is already far harder than in the US) you'll be covered quite good for 18 months and fall back to basic social support after that
- Generally a bit lower standard of living. It's not bad, of course, but 100k$+ cars, for example, are usually only leased via work, and 2k$+ laptops are a rather large expense to many people.
I consistently see JavaScript SEng roles at startups and large companies going for 40-60k.
The big cities are quite expensive, and you're not going to buy a mansion with that kind of money but it's still pretty good, especially compared to the national median.
You should check Spain. I'm paying more to the hires in latin america than I got offered while trying to work in Spain