Wordpress-Plugin Twitch Stream Status with outdated API

API
4

Because you didn’t read the docs and constructed the Helix URL incorrectly

https://api.twitch.tv/helix/streams?user_login=?

fetch(
    'https://api.twitch.tv/helix/streams?user_login='+nickname,
    {
        headers: {
            'client-id': 'ls2awgx5gfg9m1q6iopdqb1b7d0y6a'
        }
    }
)
.then(resp => { return resp.json() })
.then(resp => {
                if (resp.data && resp.data[0] {
                    // show if offline (unless 'Hide when not streaming' option enabled)
                    <?php if( get_theme_mod('sst_offline_hide') != '') { ?><?php } else { ?>jQuery('.sst-main-wrapper, .sst-main-widget-wrapper').addClass('sst-main-wrapper-active');<?php } ?>
                    // animations
                    jQuery('.sst-status-text-offline').addClass('sst-current-status');
                    setTimeout(function() {
                        jQuery('.sst-status-text-offline').addClass('sst-current-status-active');
                        jQuery('.sst-status-wrapper').addClass('sst-status-wrapper-active');
                    }, 25);
                } else {
                    // show if online
                    jQuery('.sst-main-wrapper, .sst-main-widget-wrapper').addClass('sst-main-wrapper-active');
                    // animations
                    jQuery('.sst-status-text-live').addClass('sst-current-status');
                    setTimeout(function() {
                        jQuery('.sst-status-text-live').addClass('sst-current-status-active');
                        jQuery('.sst-status-wrapper').addClass('sst-status-wrapper-active');
                    }, 25);
                }
})
.catch(err => { console.log(err) });

May work