javascript - How to check the HOST using ExpressJS? - Stack Overflow

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I have to check the HOST of the http request, if it's equal to example or www.example, I have to do a 301 redirect.

How can I do this using Node.js and Express Web Framework?

I have to check the HOST of the http request, if it's equal to example.com or www.example.com, I have to do a 301 redirect.

How can I do this using Node.js and Express Web Framework?

• javascript
• linux
• node.js
• express

Share Improve this question Follow edited Jun 29, 2011 at 17:10 MPelletier 16.6k1818 gold badges8989 silver badges140140 bronze badges asked Jun 28, 2011 at 7:55 daildail 20711 gold badge22 silver badges55 bronze badges 2

• 5 The HOST of an http request is part of the header. The request object passed to your callback has a .header() method. Did you try reading the documentation at all? – Karl Knechtel Commented Jun 28, 2011 at 8:00
• Does this answer your question? Get hostname of current request in node.js Express – Jason Commented Apr 27, 2024 at 20:27

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5 Answers 5

Sorted by: Reset to default 19

Use

req.headers.host;

or

req.header('host');

Both will return you host name. e.g localhost:3000

req.header('host')

Use that in your request handlers.

Express.js guide - request.hostname

Express.js guide - request.redirect

Do a string search, using a regular expression, as so:

if ( req.headers.host.search(/^www/) !== -1 ) {
  res.redirect(301, "http://example.com/");
}

The search method accepts a regular expression as the first argument, denoted by surrounding slashes. The first character, ^, in the expression means to explicitly look at the beginning of the string. The rest of the expression is looking for three explicit w's. If the string begins with "www", then the search method will return the index of match, if any (0), or -1, if it wasn't found.

Today for me it's req.host, req.hostname and req.headers.host - I'm going with req.host though. update vscode tells me req.host is deprecated and use req.hostname instead

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