Node.JS - Get sent data at the end in a middleware

Question

Is it possible in a middleware to get the data just sent by my API ?

For exemple I have a nodejs Server with this middleware:

    var middleware = function(req, res, next) {
       res.on('finish', function() {
          console.log(res.statusCode); // display 200
          console.log(res.body); // display empty data
      });
      next();
   };

And my API:

    app.get('/url', function(req, res) {
       res.status(200).json({name:'john'}).end();
    });

But in my middleware, I only can get the statusCode '200', but not the object {name:'john'}.

Anyone can help me ?

Thanks.

score 2 · Accepted Answer · edited May 23 '17 at 12:32

2

Add the app.use(middleware); after the router.

Source : Connect or Express middleware to modify the response.body

EDIT : Sorry, the answer I link works for old versions of Express. I have read the Express source code, and body is never saved in res when res.json() or res.send() are called.

To edit the body in Express 4, you seem to need to override res methods, or use a package which do it, like express-mung (https://www.npmjs.com/package/express-mung).

edited May 23 '17 at 12:32

Community

1
1

answered Jul 26 '16 at 15:08

F. Kauder

879
5
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I already did it, my middleware display the correct statusCode but not the body – Sparw Jul 27 '16 at 08:53
Works fine ! Thank you very much :) – Sparw Jul 27 '16 at 10:00

Node.JS - Get sent data at the end in a middleware

1 Answers1