random_searx_uxp_plugin/start.js

let answer = [];

fetch('https://searx.space/data/instances.json')
.then(response => response.json())
.then(response => {
    searx_data = response.instances;
    for (var key in searx_data)
        if (searx_data[key]['http']['grade']=='A+')
            if ('tls' in searx_data[key])
                if (searx_data[key]['tls']['grade']=='A+')
                    if ('html' in searx_data[key]) {
                      temp = searx_data[key]['html']['grade'];
                      if (temp=='V' || temp=='C')
                          answer.push(key);
                    }
    const randomInstance = answer[Math.floor(Math.random() * answer.length)];
  // to see selected instance
  // console.log(randomInstance)
})