Configure CORS in Express using middleware

express-cors.js

const app = express();
app.use(async (req, res, next) => {
	res.setHeader("Access-Control-Allow-Origin", process.env.ALLOW_ORIGIN);
	res.setHeader("Access-Control-Allow-Credentials", true);
	res.setHeader("Access-Control-Allow-Headers", "Authorization, Origin, X-Requested-With, Content-Type, Accept, X-Slug, X-UID");
	res.setHeader("Access-Control-Allow-Methods", "OPTIONS, POST, PUT, PATCH, GET, DELETE");
	next();
});