Add header to allow CORS in Node JS

gistfile1.txt

/**
 * Add header to allow CORS in node
 * Require express
 *
 * Quoting from http://stackoverflow.com/questions/18310394/no-access-control-allow-origin-node-apache-port-issue
 */

app.use(function (req, res, next) {

    // Website you wish to allow to connect
    res.setHeader('Access-Control-Allow-Origin', 'http://localhost:8888');

    // Request methods you wish to allow
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

    // Request headers you wish to allow
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

    // Set to true if you need the website to include cookies in the requests sent
    // to the API (e.g. in case you use sessions)
    res.setHeader('Access-Control-Allow-Credentials', true);

    // Pass to next layer of middleware
    next();
});

app.listen(3000);

its not working though I have included above code in my NODE App and making POST request in Angular. I am using Chrome
Access to XMLHttpRequest at 'http://localhost:8080/employees/create' from origin 'http://localhost:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
employee.service.ts:53 Error HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: "Unknown Error", url: "http://localhost:8080/employees/create ", ok: false, …}