node.js memcached client (fork to support binary values in memcached)
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node.js memcached client

A pure-JavaScript memcached library for node.

Note: this library is a derivative work of the parent project to support binary values stored in memcache (the original would mangle them with utf8 conversions). It has 2 significant behavoral changes.

  • get returns a Buffer object instead of a String object
  • all errors return proper Javascript Error objects instead of strings


To run the test suite, first insall expresso, then run make test.

If you have node-jscoverage you can also make test-cov for coverage, but that's pretty nerdy.


Create a Client object to start working. Host and port can be passed to the constructor or set afterwards. They have sensible defaults.

var Memcache = require('memcache');

var mc = new Memcache(port, host);
mc.port = 11211; = 'localhost';

The Client object emits 4 important events - connect, close, timeout and error.

mc.on('connect', function(){
	// no arguments - we've connected

mc.on('close', function(){
	// no arguments - connection has been closed

mc.on('timeout', function(){
	// no arguments - socket timed out

mc.on('error', function(e){
	// there was an error - exception is 1st argument

// connect to the memcache server after subscribing to some or all of these events

After connecting, you can start to make requests.

mc.get('key', function(error, result){
	// all of the callbacks have two arguments.
	// 'result' may contain things which aren't great, but
	// aren't really errors, like 'NOT_STORED'

mc.set('key', 'value', function(error, result){
	// lifetime is optional. the default is
	// to never expire (0)
}, lifetime);

mc.delete('key', function(error, result){
	// delete a key from cache.

mc.version(function(error, result)){
	// grab the server version

There are all the commands you would expect.

// all of the different "store" operations
// (lifetime & flags are both optional)
mc.set(key, value, callback, lifetime, flags);
mc.add(key, value, callback, lifetime, flags);
mc.replace(key, value, callback, lifetime, flags);
mc.append(key, value, callback, lifetime, flags);
mc.prepend(key, value, callback, lifetime, flags);
mc.cas(key, value, unique, callback, lifetime, flags);

// increment and decrement (named differently to the server commands - for now!)
// (value is optional, defaults to 1)
mc.increment('key', value, callback);
mc.decrement('key', value, callback);

// statistics. the success argument to the callback
// is a key=>value object
mc.stats('settings', callback);
mc.stats('items', callback);
mc.stats('mongeese', callback);

Once you're done, close the connection.


There might be bugs. I'd like to know about them.

I bet you also want to read the memcached protocol doc. It's exciting! It also explains possible error messages.