javascript help: using the melonland API to get itch.io RSS feeds & display them

[ribose]

hello! i'm trying to make a page that displays everything made on itch.io by melonland forum members using the shiny new MelonLand API, but my javascript skills are insufficient!

here's what i have so far...

• part one: get the data (i almost have this)
• fetch the list of forum member's itch.io usernames from https://forum.melonland.net/api.php?itch
• i can get the results to show up in the console log, but i'm still not sure how to get an array of just the usernames
• part two: generate list of RSS feeds from the username list (totally stuck)
• on itch.io, you can get an RSS feed for any account! for example: https://itch.io/games/by-melonking.xml
• i think i should be able to write a loop to plop the usernames into "itch.io/games/by-[USERNAME].xml", but i have no idea how to format it. i've looked over w3schools, mdn, and stackoverflow but can't seem to find anything that resembles what i'm trying to do.
• part three: generate HTML from RSS items (basically done)
• this javascript feed reader/aggregator was almost exactly what i wanted! easy 
• i added some known feeds to the array to test out the idea (it works)
• adjusted the code to include images in addition to the text and links

the page is on everyone site at everyone.melonland.net/arcade, so you can view the source and make edits at https://forum.melonland.net/pad.php?p=arcade (everyone is welcome to make edits to the style, too!)

to summarize where i'm stuck in one question: how do i connect the username list to the RSS list?
(also, is this even the right way to be thinking about this? maybe there's a better/easier/more efficient way i'm missing?)

[Melooon]

I pushed a small API fix so that itch usernames are properly filtered when people put their itch url instead 

I also added some loading logic you can see in the code, it actually fully works now, but it takes almost a full minute to render the page because the itch RSS feeds, are quite slow to load. So its looks like its not loading!

So you defo wanna add a loading alert (maybe even a loading bar!), but its a cool page! 

EDIT: I think if we split it up into a page system, so it only loaded 20 games at a time, that would be a lot faster! (you can script the pages into it, they don't need to be literally different pages) Just put a limit on the for loop of the RSS fetch, then offset the loop every time you click a forward or back button.

EDIT EDIT: Done!

[ribose]

EDIT EDIT: Done!

amazing!! thank you so much for your help with this, Melon!
i'm learning a lot from your code, and i'm also so excited that the page WORKS!!!

whenever i see a post from someone here with an itch page linked, i always visit, but this makes it so much easier to browse through them all. it's an impressive collection! i hope i can set aside some time to play a bunch of them soon!

the itch RSS feeds, are quite slow to load

oooh yeah, i wondered if there would be performance issues but i didn't expect the feeds to be the slow part! maybe itch is throttling the requests? their anti-bot measures are pretty strict... i get that cloudflare security verification thing every time i look at one of their browse pages