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captchapng

#Captcha PNG generator A numeric captcha generator for Node.js

Features

  • Only generate numeric captcha PNG image
  • Build-in fonts
  • Characters up and down, left and right limits, random displacement
  • Full JavaScript

Examples

/**
 * Captcha PNG img generator
 * @Author: George Chan
 * @Email: gchan@21cn.com
 * @Version: 1.0
 * @Date: 2013-08-18
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */
 
var http = require('http');
var captchapng = require('captchapng');
 
http.createServer(function (request, response) {
    if(request.url == '/captcha.png') {
        var p = new captchapng(80,30,parseInt(Math.random()*9000+1000)); // width,height,numeric captcha 
        p.color(0, 0, 0, 0);  // First color: background (red, green, blue, alpha) 
        p.color(80, 80, 80, 255); // Second color: paint (red, green, blue, alpha) 
 
        var img = p.getBase64();
        var imgbase64 = new Buffer(img,'base64');
        response.writeHead(200, {
            'Content-Type': 'image/png'
        });
        response.end(imgbase64);
    } else response.end('');
}).listen(8181);
 
console.log('Web server started.\n http:\\\\127.0.0.1:8181\\captcha.png');