Not when your application needs to read the response. mode: "no-cors" can produce an opaque response whose body and headers are not normally available to your JavaScript. It does not grant permission to bypass another API’s policy. 1
The fix depends on who owns the API
For your own API, check allowed origins, methods and headers on the server. Some requests require a preflight before the real request. Credentialed requests cannot simply use a wildcard Access-Control-Allow-Origin: *. 2
For someone else’s API, use its supported browser interface or an authorized server-side integration within the provider’s terms. Do not send customer data through a random public CORS proxy.
Inspect the actual failure
Compare the console message with the response in the Network panel. Determine whether the failure occurs on preflight, a redirect or the final response. Sometimes the visible CORS error accompanies a server error page that lacks the expected headers.
Do not remove authentication or open the entire API to every origin just to make one test succeed. The configuration should match the intended site and operation.
Making a browser warning disappear is not the same as establishing a safe, readable and correctly authorized data exchange.
Related reading
Frontend development and integrations
