/Javascript/React/Access to XMLHttpRequest has been blocked by CORS policy React

Access to XMLHttpRequest has been blocked by CORS policy React

/*
npm i cors
or
 yarn add cors
then in your node app
*/
const cors = require('cors');
const corsOptions ={
    origin:'http://localhost:3000', 
    credentials:true,            //access-control-allow-credentials:true
    optionSuccessStatus:200
}
app.use(cors(corsOptions));

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