@Yoru@lemmy.ml - it has to do with CORS (says in the error message) - You generally can't make cross-origin requests in the browser unless it is explicitly allowed. This is purely a browser limitation, which is why it works in your node environment. But if you open the console on any random website and try to call fetch() to that API, it's going to fail on any site other than lemmy.world.

The error message tells you why it failed