Cannot load Deezer API resources from localhost with the Fetch API

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You can make the request through a public CORS proxy; to do that try changing your code to:

fetch('https://cors-anywhere.herokuapp.com/http://api.deezer.com/search/track/autocomplete?limit=1&q=eminem')

That sends the request through https://cors-anywhere.herokuapp.com, which forwards the request to http://api.deezer.com/search/track/autocomplete?limit=1&q=eminem and then receives the response. The https://cors-anywhere.herokuapp.com backend adds the Access-Control-Allow-Origin header to the response and passes that back to your requesting frontend code.

The browser will then allow your frontend code to access the response, because that response with the Access-Control-Allow-Origin response header is what the browser sees.

You can also set up your own CORS proxy using https://github.com/Rob–W/cors-anywhere/

For details about what browsers do when you send cross-origin requests from frontend JS code using XHR or the Fetch API or AJAX methods from JavaScript libraries—and details about what response headers must be received in order for browsers to allow frontend code to access the responses—see https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS.

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