How to enable cors in Node js

  • Posted by Sharad Jaiswal

    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) then 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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