javascript - Allow multiple CORS domain in express js

Question

How do I allow multiple domains for CORS in express in a simplified way.

I have

 cors: {
        origin: "www.one.com";
    }

    app.all('*', function(req, res, next) {
            res.header("Access-Control-Allow-Origin", cors.origin);
            res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
            next();
        });

This works when there is only one domain mentioned in origin

But if I want to have origin as an array of domains and I want to allow CORS for all the domains in the origin array, I would have something like this -

cors: {
            origin: ["www.one.com","www.two.com","www.three.com"];
        }

But then the problem is this below code would not work -

app.all('*', function(req, res, next) {
                res.header("Access-Control-Allow-Origin", cors.origin);
                res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
                next();
            });

How do I make res.header take an array of domains via cors.origin ?

Answer 1

I would recommend the cors-module: https://www.npmjs.org/package/cors It does this kind of stuff for you - check the "Configuring CORS w/ Dynamic Origin"-Section