easy-captcha tries to make integrating captcha into forms a simple and painless experience.
$ npm install easy-captcha
- Fast generation of captcha image based off of CCAP using c++
- Middleware to check form submissions
- Configure number of allowed attemps
- Overide text generation function
var express = require('express');
var captcha = require('easy-captcha');
//intiate app
var app = express();
app.configure(function(){
app.use(express.bodyParser());
//need to use sessions to store the captcha information
app.use(express.cookieParser());
app.use(express.session({ secret: 'some-secret' }));
app.use('/captcha.jpg', captcha.generate());
//Choose the path of the captcha image and intiate captcha with options
});
//sample form with the captcha image.
//the default name for the captcha text is captcha
app.get('/login', function(req, res, next){
var form = ['<form action="/login" method="post">',
'<img src="/captcha.jpg"/>',
'<input type="text" name="captcha"/></form>'];
res.send(form.join('\n'));
});
//use captcha.check as middleware to check the valid captcha result
app.post('/login', captcha.check, function (req,res,next) {
//returns true is valid - the captcha value must sent in the captch field
//the error message is in the errDesc key of the captcha object
if (!req.session.captcha.valid) return res.send(401, "Captcha does not match");
res.send("Captcha matched! Well done :)");
});
app.listen(7001);easy-captcha is based on CCAP node module. Many thanks