How popular are Node.js and Python for web development?

According to this report not long ago, Node.js is used on 0.6% of websites, Python is used by 1.1% of websites:

PHP vs. Python usage statistics, December 2018

With PHP at 78% as the dominate backend language.

Node.js can probably creep up towards 1%, but I’m not really expecting it to.

I think Node.js has probably peaked, maybe if TypeScript gets a lift, it’ll take Node.js with it, but to beat Python, Node.js needs to almost double its market share, and I just don’t see that happening.

0.6% doesn’t sound like a lot, but remember it is 0.6% of all websites.

All things considered, I’d say they are already similarly popular.