Creates Captcha in base64 format
npm install nodejs-captcha
// import library
var captcha = require("nodejs-captcha");
// Create new Captcha
var possible_options=[
//a string as the argument below(will be the text used in the captcha)
"specific t3xt",
//an object as the argument below(with all the possible keys)
{
length:11, value:"thegr3ywo1f", charset:['a','b','1','2'], //charset would only be used if there is no value
width:100, height:40, numberOfCircles:10, image:"base64string" //I don't know why you would manually set these(in this line) but it IS possible
},
//a number used as the argument below(will be the length of text used in the captcha)
6,
//undefined as the argument below(nothing, like captcha())
undefined
]
let options=possible_options[ Math.floor(Math.random()*possible_options.length) ]
var newCaptcha = captcha( options );
// Value of the captcha
var value = newCaptcha.value
// Image in base64
var imagebase64 = newCaptcha.image;
// Width of the image
var width = newCaptcha.width;
// Height of the image
var height = newCaptcha.heigth;"use strict";
var http = require("http");
var captcha = require("nodejs-captcha");
var PORT = 8181;
function handleRequest(req, res) {
if (req.method === "GET" && (req.url === '/' || req.url.indexOf("index") > -1)){
let result = captcha();
let source = result.image;
res.end(
`
<!doctype html>
<html>
<head>
<title>Test Captcha</title>
</head>
<body>
<label>Test image</label>
<img src="${source}" />
</body>
</html>
`
);
}else{
res.end('');
}
}
//Create a server
var server = http.createServer({}, handleRequest);
//Start server
server.listen(PORT, function() {
console.log("Server listening on: https://localhost:" + PORT);
});It is recommended to store the value of the captcha in order to check the validity of the user's answer to challange