I've recently read an interesting article, talking about the job market for JavaScript in 2016.
While the article presented great points on why Web Developers should invest some time and work with JavaScript, the job & market related information was US-centric. I wanted to see how things look like on the European front.

Numbers of JavaScript related jobs in major EU cities

Indeed (the website that was used in the original article to count jobs) has localized versions for most EU countries.
I looked into each capital and/or major tech city in the EU, and searched for jobs that have the keyword JavaScript.

City	JavaScript jobs
London, UK	8440
Paris, France	3409
Berlin, Germany	1426
Dublin, Ireland	1304
Amsterdam, Netherlands	1227
Munich, Germany	1136
Madrid, Spain	1088
Warsaw, Poland	1049
Brussels, Belgium	495
Stockholm, Sweden	479
Budapest, Hungary	479
Rome, Italy	451
Prague, Czech Republic	443
Helsinki, Finland	310
Vienna, Austria	288
Copenhagen, Denmark	113

It's important to note that Indeed is not as popular in Europe as it is in the US.
I was on a search for some data that could give me a better indication into how lively the JavaScript community really is in these cities.

Meetups strength

After looking at a few websites, and talking to a few colleagues, I've realized that Meetup.com is a pretty good indication into how active a local community can be. It's not a 100% accurate, but it's surprisingly close.
Here's the same table as before, with the added number of members on the local AngularJS + Meteor Meetup groups:

City	JavaScript jobs	JavaScript Meetup members
London, UK	8440	4714
Paris, France	3409	4151
Berlin, Germany	1426	1893
Dublin, Ireland	1304	857
Amsterdam, Netherlands	1227	1536
Munich, Germany	1136	957
Madrid, Spain	1088	2200
Warsaw, Poland	1049	892
Brussels, Belgium	495	688
Stockholm, Sweden	479	949
Budapest, Hungary	479	565
Rome, Italy	451	151
Prague, Czech Republic	443	158
Helsinki, Finland	310	338
Vienna, Austria	288	844
Copenhagen, Denmark	113	417

Short note about Brussels: Brussels doesn't have an AngularJS group, but AngularJS Belgium has 2 out of 5 meetings in Brussels, so I multiplied their number of members by 2/5 (to factor that in).

It's all relative

There's something we're forgetting here - these cities have very different sizes.
Amsterdam, for example, has a population of only ~832,000 people, yet it has 1227 JavaScript related Job postings. That's far more impressive then most other cities!
For the final table, I've decided to show the Indeed and Meetup numbers (separately),
relative to each city's population:

City	# of people per 1 Job	# of people per 1 Meetup Member
London, UK	1011	1811
Paris, France	657	539
Berlin, Germany	2498	1881
Dublin, Ireland	404	615
Amsterdam, Netherlands	678	542
Munich, Germany	1239	1471
Madrid, Spain	2909	1438
Warsaw, Poland	1658	1950
Brussels, Belgium	354	255
Stockholm, Sweden	1915	966
Budapest, Hungary	3669	3110
Rome, Italy	5866	17523
Prague, Czech Republic	2842	7968
Helsinki, Finland	2020	1852
Vienna, Austria	6340	2163
Copenhagen, Denmark	5162	1398

Conclusion

I wasn't surprised to see Amsterdam & London among the top cities.
Brussels was quite a shocker to be honest. I've heard that the city is quite concentrated when it comes to Tech,
but I had no idea that it would come on top on the final table.

Seeing Vienna almost at the bottom did reflect my assumptions towards the local scene there - while very much alive and kicking, it's not very substantial when you're reminded that Vienna has a population of 1.8 Million.

By the way, the 2nd and 3rd tables are sortable.

Here's my Jingle Bells post from Christmas 2013, if you are looking for something more festive :)