CODEWITHSUNDEEP
javascriptnode.jsexpress
Nicola Peluchetti
Nicola Peluchetti

Reputation: 76880

How do I get the domain originating the request in express.js?

I'm using express.js and I need to know the domain which is originating the call. This is the simple code

app.get(
    '/verify_license_key.json',
    function( req, res ) {
        // do something

How do I get the domain from the req or the res object? I mean I need to know if the API was called by somesite.example or someothersite.example. I tried doing a console.dir of both req and res but I got no idea from there, also read the documentation but it gave me no help.

Upvotes: 134

Views: 210738

Answers (5)

Jonathan Lonowski
Jonathan Lonowski

Reputation: 123463

You have to retrieve it from the HOST header.

const host = req.get('host');

It is optional with HTTP 1.0, but required by 1.1. And, the app can always impose a requirement of its own.

If this is for supporting cross-origin requests, you would instead use the Origin header.

const origin = req.get('origin');

Note that some cross-origin requests require validation through a "preflight" request:

req.options('/route', function (req, res) {
    const origin = req.get('origin');
    // ...
});

If you're looking for the client's IP, you can retrieve that with:

const userIP = req.socket.remoteAddress;

Note that, if your server is behind a proxy, this will likely give you the proxy's IP. Whether you can get the user's IP depends on what info the proxy passes along. But, it'll typically be in the headers as well.

Upvotes: 221

hoogw
hoogw

Reputation: 5525

Year 2022, I use express v4.17.1 get following result

var host = req.get('host'); // works, localhost:3000

var host = req.headers.host; // works, localhost:3000

var host = req.hostname; // works, localhost

var origin = req.get('origin'); // not work, undefined

var origin = req.headers.origin; // not work, undefined

enter image description here

Upvotes: 6

molagbal
molagbal

Reputation: 331

req.get('host') is now deprecated, using it will give Undefined.

Use,

    req.header('Origin');
    req.header('Host');
    // this method can be used to access other request headers like, 'Referer', 'User-Agent' etc.

Upvotes: 6

DiegoRBaquero
DiegoRBaquero

Reputation: 1274

In Express 4.x you can use req.hostname, which returns the domain name, without port. i.e.:

// Host: "example.com:3000"
req.hostname
// => "example.com"

See: http://expressjs.com/en/4x/api.html#req.hostname

Upvotes: 17

Michiel
Michiel

Reputation: 4260

Instead of:

var host = req.get('host');
var origin = req.get('origin');

you can also use:

var host = req.headers.host;
var origin = req.headers.origin;

Upvotes: 59

Related Questions