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How to enable cors in Node js

Enabling CORS in Node js

In this article, we are going to see how to enable CORS ( Cross-Origin Resource Sharing ) in Node JS. CORS essentially means cross-domain requests.

Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HTTP headers to let a user agent gain permission to access selected resources from a server on a different origin (domain) than the site currently in use. A user agent makes a cross-origin HTTP request when it requests a resource from a different domain, protocol, or port than the one from which the current document originated.

To enable CORS in NODE Js simply add below line of code. It will set a header on your response in result  CORS are enabled.

res.header("Access-Control-Allow-Origin", "*");

Use following code snippet to enable CORS for all resources on your Node server.

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

Here is the complete code to enable CORS in Node Js:

var app = express();
app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});
app.get('/', function (req, res) {
  var data = {
    "results": [
      "Anil",
      "Amit"    ]
  };
  res.json(data);
});
app.get('/testCors', function(req, res){
  var file = __dirname + '/ZipFile.zip';
  res.download(file); // Set disposition and send it.
});

That it, Thanks for Reading. Also, Read Node js interview questions

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