CODE EXAMPLE FOR TYPESCRIPT

cors npm typescript

$ npm i cors

const cors = require('cors');

const app = express();

app.use((req, res, next) => {
  res.setHeader("Access-Control-Allow-Origin", "*");
  res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization");
  res.setHeader("Access-Control-Allow-Methods", "GET, POST, PATCH, PUT, DELETE, OPTIONS");
  res.setHeader("Access-Control-Allow-Headers", "append,delete,entries,foreach,get,has,keys,set,values,Authorization");
  next();
});

app.use(cors());