Sometimes, we want to allow CORS in JavaScript.

In this article, we’ll look at how to allow CORS in JavaScript.

How to allow CORS in JavaScript?

To allow CORS in JavaScript, we can use the res.header method.

For instance, we write

const app = express();

app.use((req, res, next) => {
  res.header("Access-Control-Allow-Origin", "*");
  res.header(
    "Access-Control-Allow-Headers",
    "Origin, X-Requested-With, Content-Type, Accept"
  );
  next();
});

to call app.use with a callback that sends the headers to enable CORS.

We send the Access-Control-Allow-Origin and Access-Control-Allow-Headers headers to enable CORS.

Conclusion

To allow CORS in JavaScript, we can use the res.header method.