Beginner to Jira API: fetching issues with a serverless React.js app

Hey, sorry if this question sounds dumb but I’ve already spent days trying to figure this supposedly simple thing out on my own from the documentation/google. :exploding_head:

I have a very basic, static React.js app that doesn’t have a Node server and sits on Netlify.

What I want is to fetch all the issues currently assigned to me, using a search query such as this:

I have been trying this one with and without the Authorization header, but getting blocked by Cors ‘Access-Control-Allow-Origin’.

      headers: {
        Authorization: `Basic ${Buffer.from(`${API_USER}:${API_KEY}`).toString(
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Methods": "GET,PUT,POST,DELETE,PATCH,OPTIONS",
  .then((res) => {

What solutions are there (if any) if I do not want to run an express server behind my app?

Kind regards,