express-trace

Express tracer and middleware profiler.

Installation

 $ npm install express-trace

NOTE: supports express >= 2.3.5

Example

Suppose we have the following express app with a few routes that can satisfy a url with the form GET /user/NAME, and some middlware

app.use(express.favicon());
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(express.cookieParser());
app.use(express.session({ secret: 'foo' }));
app.use(express.static(__dirname));

app.get('/user/:name', ensureUsername('tj'), function(req, res, next){
  res.send('loaded tj');
});

app.get('/user/:name', function(req, res, next){
  setTimeout(next, 1000);
});

app.get('/user/:name', function(req, res, next){
  setTimeout(next, 200);
});

app.get('/user/tobi', function(req, res, next){
  res.send('loaded tobi');
});

all we need to do before we listen(), is require() express-trace and apply it to the app. This essentially wraps all of the middleware and routes with functions used for reporting.

require('express-trace')(app);

stderr for GET /user/tobi:

  GET /user/tobi
  middleware / anonymous 1ms
  middleware / favicon 0ms
  middleware / bodyParser 0ms
  middleware / methodOverride 0ms
  middleware / cookieParser 0ms
  middleware / session 1ms
  middleware / static 0ms
  middleware / router
    app.get(/user/:name) 0ms
      middleware ensureUsername 73ms
    app.get(/user/:name) 1000ms
    app.get(/user/:name) 200ms
    app.get(/user/tobi) 
  responded to GET /user/tobi in 1279ms with 200 "OK"

License

(The MIT License)

Copyright (c) 2011 TJ Holowaychuk <tj@vision-media.ca>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.