Detecting AJAX requests on NodeJS with Express

Ajaxnode.jsExpress

Ajax Problem Overview

I'm using NodeJS with Express. How can I tell the difference between an ordinary browser request and an AJAX request? I know I could check the request headers but does Node/Exprsss expose this information?

Ajax Solutions

Solution 1 - Ajax

Most frameworks set the X-Requested-With header to XMLHttpRequest, for which Express has a test: 

app.get('/path', function(req, res) {
  var isAjaxRequest = req.xhr;
  ...
});

Solution 2 - Ajax

In case the req.xhr is not set, say in frameworks such as Angularjs, where it was removed, then you should also check whether the header can accept a JSON response (or XML, or whatever your XHR sends as a response instead of HTML).

if (req.xhr || req.headers.accept.indexOf('json') > -1) {
  // send your xhr response here
} else {
  // send your normal response here
}

Of course, you'll have to tweak the second part a little to match your usecase, but this should be a more complete answer.

Ideally, the angular team should not have removed it, but should have actually found a better solution for the CORS' pre-flight problem, but that's how it rests now...

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionmichaelView Question on Stackoverflow
Solution 1 - AjaxrobertklepView Answer on Stackoverflow
Solution 2 - AjaxkumarharshView Answer on Stackoverflow