express/connect middleware which executes after the response is sent to the client

Question

Is it possible to write a middleware which executes after the response is sent to a client or after the request is processed and called just before sending the response to client?

Sinuous

Answer 1

pauljz gave the basic method but to expand on that here is an example of middleware

module.exports = function() {
  return function(req, res, next) {
    req.on("end", function() {
      // some code to be executed after another middleware
      // does some stuff
    });
    next(); // move onto next middleware
  }
}

In your main app

expressApp.use(require("./doneMiddleware"));
expressApp.use(express.logger());
expressApp.use(express.static.....

Steere

If I understand correctly, this event will trigger when the client completes sending request/data to server. But what I want is, after calling response.render or response.redirect etc, the middle ware should be executed. – Sinuous

No, this event is emitted once the entire request is done, including sending the response. So long as render/redirect call response.end the associated request will emit end. – Steere

@SelvarajMA The following approach may be better: https://mcmap.net/q/764107/-how-to-have-a-nodejs-connect-middleware-execute-after-responde-end-has-been-invoked. – Corunna

Answer 2

See if binding to req.on('end', function() {...}); will work for you.

Alabama

If I understand correctly, this event will trigger when the client completes sending request/data to server. But what I want is, after calling response.render or response.redirect etc, the middle ware should be executed. – Sinuous