expressJS

  const app = express();

/**
* Changes made to enable CORS
*/

const allowCrossDomain = (req, res, next) => {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, token');

    // intercept OPTIONS method
    if ('OPTIONS' == req.method) {
        res.sendStatus(200);
    }
    else {
        next();
    }
};

//Allow cross domain.
app.use(allowCrossDomain);