CODEWITHSUNDEEP
node.jsexpress
Pete perpetual motion machine
Pete perpetual motion machine

Reputation: 31

Express js middleware on app level

im using expressJs and want to execute some middleware at the end of each request.

Is it possible to define this on app-level to avoid defining it on each route?

Upvotes: 0

Views: 750

Answers (2)

Gökay Gürcan
Gökay Gürcan

Reputation: 1092

You can use app.use([path,] function [, function...]) for this.

Here's an example from Express' docs:

// this middleware will be executed for every request to the app
app.use(function (req, res, next) {
  console.log('Time: %d', Date.now());
  next();
})

And of course, you can define a function elsewhere and pass it to the use method.

function middleware(req, res, next) {
  console.log('middleware!');
  next();
}

// some other codes maybe

app.use(middleware);

Upvotes: 0

Roberto Pitocchi
Roberto Pitocchi

Reputation: 27

Check this example. The code "console.log('Response sent')" will be executed on the end of each request to any route.

var express    = require('express');
var app        = express();

function myMiddleware (req, res, next) {
    res.on('finish', function() {
        console.log('Response sent.');
    });
    next();
}

app.use(myMiddleware);

app.get('/first', function(req, res, next) {
    console.log('[/first] New request recieved.');
    res.end('Hi!');
});

app.get('/second', function(req, res, next) {
    console.log('[/second] New request recieved.');
    res.end('Hi!');
});

app.listen(3000, function(req, res) {
    console.log('Listening port 3000');
});

Upvotes: 2

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