Outputs variables in a visual, easy to read format based on Adobe ColdFusion's CFDump tag with enhancements unique to node.js such as the syntax highlighting of functions. Think of it as console.log on steroids.
For example, simply doing nodedump(user) gives us:
The above is a dump of the variable user created like so:
signIn = function(username, password){
// validate username and password
if(!validate(username, password))
return false;
else
updateSession();
// user is signedIn
this.signedIn = true;
return true;
};
var user = {
firstName: 'Charles'
,lastName: 'Teague'
,age: 21
,signedIn: false
,signIn: signIn
,projects: [
{
name: 'Allaire Spectra'
,status: 'Horrible death'
}
,{
name: 'ColdFusion 4.5'
,status: 'Been there done that'
}
]
};With console.log(user) we get:
{ firstName: 'Charles',
lastName: 'Teague',
age: 21,
signedIn: false,
signIn: [Function],
projects:
[ { name: 'Allaire Spectra', status: 'Horrible death' },
{ name: 'ColdFusion 4.5', status: 'Been there done that' } ] }Which is the typical output we have to rely on usually to do our debugging. As our variables become more complicated this becomes a painful way to know what's going on within them.
nodedump is based on the CFDump tag of Adobe's ColdFusion which has long been a unique feature allowing developers to understand what's in any variable. Once you get accustomed to the color coding and layout of dumped output, your brain will be able to quickly see and understand what's in any variable you dump with just a glance. Pretty much all the options available for CFDump have been included in nodedump.
Run this from your bash or command line:
$ [sudo] npm install nodedumpFirst, require nodedump:
require('nodedump');This will create a global function called nodedump. Then in your view or wherever you output to the browser, whenever you want to dump the contents of a variable do:
nodedump(vartodump);See the calling nodedump section section for the various ways to call and name the function that is used for dumping.
The following example sets up a server, creates a test object and dumps it to the browser. Try it!
var http = require('http');
nodedump = require('nodedump').dump;
signIn = function(username, password){
// validate username and password
if(!validate(username, password))
return false;
else
updateSession();
// user is signedIn
this.signedIn = true;
return true;
};
var server = http.createServer(function(request, response) {
console.log('Request received',new Date());
console.log('url:',request.url);
// skip requests for favicon
if (request.url.indexOf('favicon.ico') > -1) {
console.log('favicon requested');
response.writeHead(500);
response.end();
console.log('Request ended');
return;
}
// start output to the browser
response.writeHead(200, {"Content-Type": "text/html"});
var user = {
firstName: 'Charles'
,lastName: 'Teague'
,age: 21
,signedIn: false
,signIn: signIn
,projects: [
{
name: 'Allaire Spectra'
, status: 'Horrible death'
}
,{
name: 'ColdFusion 4.5'
,status: 'Been there done that'
}
]
};
//capture dump
var output = nodedump(user);
// write response to the browser
response.write(
'<html>'
+ '<head>'
+ '<title>nodedump example!</title>'
+ '</head>'
+'<body>'
+output
+'</body>'
+'</html>'
);
response.end();
console.log('Request ended');
//console.log('global.bnodedumpinited',global.bnodedumpinited);
}).listen(3000);
console.log("Server has started.");Options can be passed as an object whenever you nodedump a variable as the second parameter, e.g. nodedump(vartodump, options)
The available options are:
label- String. Output on the header of the dump.expand- Boolean/Array. Defaults totrue. The dump can be collapsed entirely by passingfalse. Simply click on the headers in order to expand them. An array of types can be passed and the keys of those objects will be expanded while everything else collapsed. For e.g.['Array', 'Object', 'Function']show- Array. A list of object keys / array positions to show. Others not in the list will be hidden.hide- Array. A list of object keys / array positions to hide.top- Number. The number of array positions of the dump variable to show. For objects, this is the number of keys of the top level to show.levels- Number. How many nested levels of an object to dump down to.sortKeys- Boolean. Defaults totrue. Tells nodedump to output the keys of objects sorted alphabetically. Iffalse, keys will be output in whatever order node.js returns them (usually the order in which they were added).syntaxHighlight- Boolean. Defaults totrue. Tells whether or not the dump of functions should be syntax highlighted (color-coded).dumpFunctionName- String. Defaults to'nodedump'. Name to use for the nodedump function. E.g. if this is changed to'dump'then in addition to doingnodedump(vartodump)you can dodump(vartodump).
###expand and label
nodedump(user1, {expand: false, label: 'User1'});
nodedump(user2, {expand: false, label: 'User 2'});Outputs:
Clicking on the header of collapsed sections will expand them.
###top with an object
nodedump(user, {top:4});Outputs:
Notice that though the object has 6 keys, only the top 4 were output.
###top with an array
nodedump(user.projects, {top:1});Outputs:
###levels
nodedump(user, {levels:2});Outputs:
Notice that in the projects sub-array that the 3rd level is not shown.
###show
nodedump(user, {show:['signedIn','age','lastName']});Outputs:
###hide
nodedump(user, {hide:['projects']});Outputs:
Default options can be overriden by calling the init method on nodedump. E.g.
require('nodedump').init({
dumpFunctionName: 'dump'
,top: 100
,sortKeys: false
,expand: false
});The above would set the default for all nodedumps as follows:
- You could do
dump(vartodump)insteadnodedump(vartodump). Keep in mind that the latter would still work. - Output no more than 100 top keys.
- Not sort object keys.
- Show all nodedumps collapsed.
require('nodedump') will create the global function nodedump that can be used to dump variables. As you've seen with the dumpFunctionName option you can add another name for the function and use that instead. Another way to do this is to set your variable directly to the dump function. E.g.:
d = require('nodedump').dump;So now you'd be able to dump variables using d(vartodump).
You can do this even when initializing nodedump with default options:
d = require('nodedump').init({ expand: false }).dump;