devel-info

Collect dev-related data in node.js apps (environment, cluster, process, system, request...) and show it in pretty format. May be useful for overall application state overview in production environments.

Installation

Use npm to install it to your app:

npm install --save devel-info

Usage

As node server or connect/express middleware

Run following script:

var develInfo = require('devel-info');
 
// for node server
require('http')
    .createServer(develInfo())
    .listen(8011);
 
// or for connect middleware
require('connect')()
    .use(develInfo())
    .listen(8011);

and navigate to http://127.0.0.1:8011/devel-info after application starts.

Additional initialization should be applied on cluster setup to collect information about workers:

var develInfo = require('devel-info');
var cluster = require('cluster');
develInfo.initCluster(cluster);
 
if (cluster.isMaster) {
   // master init
} else {
   // workers init
}

See example for working solution.

As standalone function

var develInfo = require('devel-info');
 
develInfo(function(err, data) {
    if (!err) {
        console.log(data);
    }
});

Options

develInfo([config], [callback], [clientRequest|])

1. config could be an object with following options:

   • url — url for devel-info page (default: '/devel-info').
   • type — output format (default: 'html' for using as middleware or 'json' for using with callback)
   • sections — info sections collected from node app environment (default: ['package', 'proc', (config.custom), 'request', 'request.parsed', 'request.headers', 'request.headers.cookie', 'os', 'process', 'process.env', 'os.networkInterfaces'])
   • custom — custom object with any data to show in devel-info page (default: undefined)

   config could be String or Array and will be treated as sections option in this case. Also, config argument could be skipped — the defaults will be used.

2. callback is a function which called on info gathering finish. Use it if you want to control all this stuff manually ;)

3. clientRequest is a node object which represents an in-progress request. Used for collecting request-related information and make sense only when using callback.

Demo

Run directly from your application root for quick demonstration:

node node_module/devel-info/example

License

MIT license