You might get the “Unexpected token ‘T’” error or “404 (Not Found)” error when calling an endpoint from a client App like React. This might be because the request is blocked by the browser due to a CORS error or “same-origin” policy. Example error from a react application calling a .Net Core API endpoint: TheContinue reading “Error: Uncaught (in promise) SyntaxError: Unexpected token ‘T’, “The resour”… is not valid JSON”