Did you know YouTube has RSS feeds? No? Probably because YouTube makes them nearly impossible to find. But here's an easy way to get the RSS feed for any YouTube user. Inspired by <https://eggfreckles.net/notes/youtube-rss/>

youtube-rss.sh

#!/usr/bin/env zsh -f
# Purpose: 	get the RSS feed for a YouTube page
# Inspired By: 	https://eggfreckles.net/notes/youtube-rss/
# Gist: 	https://gist.github.com/tjluoma/fdbc63ceb78a2aecd3d638fd18b6ec6e
#
# From:	Timothy J. Luoma
# Mail:	luomat at gmail dot com
# Date:	2020-01-17; updated 2021-01-10

# 2021-01-10 YouTube currently has both 'rssUrl' and
# 	link rel="alternate" type="application/rss+xml" title="RSS" href="…"
# 	which I do not believe where there a year ago when I first wrote this
# 	I am looking for the latter, and if I don't find it, I fallback to the
# 	former. If neither are found, an error is reported to the user.
#
# 2021-01-10 (Update 2): The previous comment only applies if you are looking
#	at a channel page, i.e. "https://www.youtube.com/512pixels" but NOT if you
#	are looking an an individual video such as 'https://www.youtube.com/watch?v=gQgSdwkvaDg'
#
# Version 2021-01-10.2 -- This script _should_ now work on either of those kinds of pages

NAME="$0:t:r"

if [[ -e "$HOME/.path" ]]
then
	source "$HOME/.path"
else
	PATH="/usr/local/scripts:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin"
fi

COUNT='0'

for URL in "$@"
do

	LINK_REL=$(curl -sfLS "${URL}" \
				| tr '<|>|,|\r' '\n' \
				| awk -F'"' '/application\/rss\+xml/{print $8}')

	if [[ "$LINK_REL" == "" ]]
	then

## Do Not Indent
CHANNEL_ID=$(curl -sfLS "$URL" \
| sed -e 's#<#\
<#g' \
-e 's#>#>\
#g' \
| awk -F'"' '/meta itemprop="channelId"/{print $4}')
## END - Do Not Indent

		if [[ "$CHANNEL_ID" == "" ]]
		then

			echo "$NAME: '\$CHANNEL_ID' and '\$LINK_REL' are both empty for '${URL}'." >>/dev/stderr

			((COUNT++))

			continue

		else

			FEED="https://www.youtube.com/feeds/videos.xml?channel_id=$CHANNEL_ID"

		fi

	else
		FEED="$LINK_REL"
	fi

	echo "$FEED"

			# copy URL to clipboard
	echo -n "$FEED" | pbcopy

done

if [[ "$COUNT" == "0" ]]
then
	# echo "$NAME: No errors"
	exit 0
elif [[ "$COUNT" == "1" ]]
then
	echo "$NAME: One error"
else
	echo "$NAME: $COUNT errors"
fi

exit $COUNT

#EOF

Thanks! I checked again and YouTube seems to have made the RSS feeds easier to find (for now?) so I updated the script to look for the two most-common places it now appears.

BAH! No, I'm an idiot. My new script only works if you are already on the homepage for a channel, not the page of an individual video.

basically searching for externalId which seems to work better... ref:

I'm not finding externalId at all in URLs of YouTube videos. I do find them on the home pages of YouTube channels, but that's not what I wanted. My idea was to go from "I like this video, I want to find the RSS feed for this channel" not "I have a channel, show me the feed dor it.

Ok, as of 2021-01-10 around 5:55 pm US/Eastern, it should be working again, and should work better than before because you can use it both on homepages such as https://www.youtube.com/512pixels as well as individual videos such as https://www.youtube.com/watch?v=3oeM_x11mog

Hey, thanks for sharing.
I've tested with a few channels and noticed that not all the videos from youtube are available in the RSS feed.
Has anyone else also encountered this and know why that is the case?

If you just want to extract the URL with an Javascript Bookmarklet, just copy the following snippet in a bookmark link:

javascript:(()=>{alert(ytInitialData.metadata.channelMetadataRenderer.rssUrl);})();

Thanks @tjluoma for the hint in your comments