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node-ccap —— node.js generate captcha using c++ library CImg. Build Status

You can generate captcha without install any other libraries or software, only do npm install ccap, that's all.

support node 0.12.x and 4.x.x

node-ccap support linux, windows and mac.

compile maybe cost you 1 minute,simply wait;

linux support jpeg,windows and mac only support bmp!

Please never using ccap in production on windows and mac, only with linux.


generate captcha picture 1204/sec;//BMP unzip


npm install ccap (new version, need node 0.12.x and 4.x.x and 6.x.x, on linux need gcc v4.8+)

npm install ccap@0.5.3 (stop update, need node 0.8.x - 0.10.x)

var ccap = require('ccap')

if you don't want to update gcc version, ccap package Compiled file is in folder release, just download it and copy it to your node_modules.

if you are in China (and behind the GWF), please use cnpm to install ccap like this

1.npm install cnpm -g --registry=

2.cnpm install node-gyp -g

2.cnpm install ccap


these three ways all will be ok:

var captcha = ccap();

var captcha = ccap(width, height, offset);

var captcha = ccap({
	width:256,//set width,default is 256

	height:60,//set height,default is 60

	offset:40,//set text spacing,default is 40

	quality:100,//set pic quality,default is 50

	fontsize:57,//set font size,default is 57

	generate:function(){//Custom the function to generate captcha text
	     //generate captcha text here

	     return text;//return the captcha text




var captcha = ccap();

var ary = captcha.get();//ary[0] is captcha's text,ary[1] is captcha picture buffer.

var text = ary[0];

var buffer = ary[1];

Simple Example

var http = require('http');

var ccap = require('ccap')();//Instantiated ccap class 

http.createServer(function (request, response) {

	if(request.url == '/favicon.ico')return response.end('');//Intercept request favicon.ico

	var ary = ccap.get();

	var txt = ary[0];

	var buf = ary[1];




console.log('Server running at');

Stop and start timer cache

var ccap = require('ccap')();

ccap.timerIsRunning(); //now timer is running, return 1

ccap.clearTimeout(); //stop all create capature image, so will use the same the 20(default is 20) capature images

ccap.timerIsRunning();//now timer is stoped, return 0

captcha8.setTimeout();//now timer is start again

ccap.timerIsRunning();//now timer is stoped, return 1


Copyright (c) 2013 wu zhonghua <>
The MIT License
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
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the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.