JAVASCRIPT

Can’t connect Express.js server to the Angular frontend

constructor() {
  this.app = express()
}

Initialize{
    this.app.use((req, res, next) => {
      res.header('Access-Control-Allow-Origin', '*');
      res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
      res.header('Access-Control-Allow-Methods', 'OPTIONS, GET, POST, PUT');
      if('OPTIONS' === req.method){
        res.sendStatus(200);
      }
      else {
          next();
      }
    })

  this.app.use(RouterWebservices)

    this.app.listen(your.HttpPort, your.Ip, () => {
      console.log('Server now listening at ', your.HttpPort, 'IP ', your.Ip);
    })
}

Can’t connect Express.js server to the Angular frontend

export const RouterWebservices = express.Router()

RouterWebservices.get('/fetchdata', FetchWebservice)