Hi, cloudflare is blocking access to the API. It only works without querystring parameters. For example open an incognito window and this URL works
https://umod.org/plugins/search.json
This gets verified by cloudflare and so it doesn't work programmatically:
https://umod.org/plugins/search.json?query=&page=1&sort=title&sortdir=asc&filter=&author=