Node Captcha
nodejs-captcha – npm
nodejs-captcha0. 0. 6 • Public • Published 7 months ago Readme Explore BETA1 Dependency0 Dependents6 Versions
Creates Captcha in base64 format
npm install nodejs-captcha
// import library
var captcha = require(“nodejs-captcha”);
// Create new Captcha
var newCaptcha = captcha();
// Value of the captcha
var value =
// Image in base64
var imagebase64 =;
// Width of the image
var width =;
// Height of the image
var height =;
sample usage with nodejs
“use strict”;
var = require(“”);
var PORT = 8181;
function handleRequest(req, res) {
if ( === “GET” && ( === ‘/’ || (“index”) > -1)){
let result = captcha();
let source =;
(
`
`);}else{
(”);}}
//Create a server
var server = eateServer({}, handleRequest);
//Start server
(PORT, function() {
(“Server listening on: 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
10 Best Node.js Captcha API Libraries in 2021 | Openbase
CategoriesLeaderboardSearch npm packages or categoriesCategoriesAPIsDatabase APIsCaptcha APICurated by the Openbase team and moreCurated by the Openbase team and community. Learn moreerexpress-recaptchaImplementation of google recaptcha v2 & V3 solutions for express. jsLicense: MITTypeScript Definitions: Built-InUser Rating5. 0/ 51Top FeedbackN/AGitHub Stars109Weekly Downloads12KLast Commit7mos agoBundle Size (min+gzip)1. 60KBNot Tree-Shakeablesvg-captchagenerate svg captcha in nodeLicense: MITTypeScript Definitions: Built-InUser Rating5. 0/ 52Top Feedback1Easy to Use1Performant1Highly CustomizableGitHub Stars1KWeekly Downloads13KLast Commit2yrs agoBundle Size (min+gzip)41. 7KBNot Tree-ShakeablecapcaptchaSimple captcha for and cense: MITTypeScript Definitions: DefinitelyTypedUser Rating4. 0/ 51Top Feedback1Great Documentation1Easy to Use1Unwelcoming CommunityGitHub Stars131Weekly Downloads11Last Commit5yrs agoBundle Size (min+gzip)3. 40KBNot Tree-Shakeablejcjs-captchaTiny captcha component (~2KB) written in pure JavaScript with no dependenciesLicense: MITTypeScript Definitions: DefinitelyTypedUser RatingN/ATop FeedbackN/AGitHub Stars39Weekly Downloads91Last Commit1mo agoBundle Size (min+gzip)0. 75KBNot Tree-Shakeablerecrecaptcha2Easy verifier for google reCAPTCHA version 2 for and Express. jsLicense: MITTypeScript Definitions: DefinitelyTypedUser RatingN/ATop FeedbackN/AGitHub Stars45Weekly Downloads9KLast Commit2yrs agoBundle Size (min+gzip)186. 0KBNot Tree-ShakeableantanticaptchaA modern JS/TS wrapper around anti-captcha API (Captcha Breaker Software)License: MITTypeScript Definitions: Built-InUser RatingN/ATop FeedbackN/AGitHub Stars17Weekly Downloads988Last Commit4mos agoBundle Size (min+gzip)11. 4KBNot Tree-Shakeable2n2captcha-nodeJust a lightweight captcha solver using 2CaptchaLicense: MITTypeScript Definitions: Built-InUser RatingN/ATop FeedbackN/AGitHub Stars14Weekly Downloads923Last Commit1yr agoBundle Size (min+gzip)3. 44KB Tree-ShakeablecapcaptchapngA captcha generator for node. jsLicense: BSD-2-ClauseTypeScript Definitions: DefinitelyTypedUser RatingN/ATop FeedbackN/AGitHub Stars201Weekly Downloads552Last Commit5yrs agoBundle Size (min+gzip)2. 37KBNot Tree-Shakeabletrek-captchaA Lightweight Pure JavaScript Captcha for No C/C++, No ImageMagick, No cense: MITTypeScript Definitions: DefinitelyTypedUser RatingN/ATop FeedbackN/AGitHub Stars393Weekly Downloads370Last Commit3yrs agoBundle Size (min+gzip)5. 19KBNot generate captcha using c++ library CImg without install any other lib or softwareLicense: UnknownTypeScript Definitions: DefinitelyTypedUser RatingN/ATop FeedbackN/AGitHub Stars477Weekly Downloads58Last Commit5yrs agoBundle Size (min+gzip)7. 87KBNot Tree-Shakeable
captcha creation for nodejs – Stack Overflow
I am trying to place a captcha on the registration page of a website.
How can I show a captcha in
asked Nov 15 ’11 at 6:52
I have found one which is smart written with pure js:
captchapng
Features
Only generate numeric captcha PNG image
Build-in fonts
Characters up and down, left and right limits, random displacement
Full JavaScript
It will generate png like:
And here is my code:
ejs -[express3. x]
{<br />
var p = new captchapng(80, 30, parseInt(()*9000+1000)); // width, height, numeric captcha<br />
(115, 95, 197, 100); // First color: background (red, green, blue, alpha)<br />
(30, 104, 21, 255); // Second color: paint (red, green, blue, alpha)<br />
var img = tBase64();<br />
var imgbase64 = new Buffer(img, ‘base64’);<br />
return imgbase64;}<br />
dex_get = function(req, res){<br />
var valicode = new Buffer(captchaImg()). toString(‘base64’);<br />
(‘index’, {‘valicode’: valicode});};<br />
answered Feb 27 ’14 at 12:54<br />
EddyEddy2, 96734 silver badges40 bronze badges<br />
2<br />
You could use nodejs-recaptcha.<br />
Here is my example using it in conclusion with the Express framework handling an ajax postrequest to display contact data protected by a reCaptcha.<br />
(‘/ajax/contact/’, function(req, res, next) {<br />
var recaptcha = new Captcha();<br />
// Eventhandler that is triggered by checkAnswer()<br />
(‘data’, function (recaptcha_response) {<br />
(‘contact’, {<br />
layout: ”,<br />
locals: {<br />
recaptcha: _valid? ‘valid’: ‘invalid’}});});<br />
// Check the user response by calling the google servers<br />
// and sends a ‘data’-event<br />
eckAnswer(‘aLfsZvFVbAbAbzsxlnHbH7wxx0PbNbGabHXbpZgl’, // private reCaptchakey (invalidated)<br />
moteAddress,, );});<br />
answered Feb 15 ’12 at 16:10<br />
Felix GertzFelix Gertz1652 silver badges7 bronze badges<br />
1<br />
There is nodejs-recaptcha, but I don’t know how mature it is.<br />
answered Nov 15 ’11 at 9:40<br />
Jan JongboomJan Jongboom25. 1k8 gold badges77 silver badges117 bronze badges<br />
Check out node-captcha-generator<br />
It uses the MNIST Database to generate numerical captcha images. Pretty easy to integrate. I had used it on a previous website, it generates captcha images that look like this<br />
Very simple usage as well. Here is an example for a GET request for generating a new Captcha image on each request (Express):<br />
let Captcha = require(‘node-captcha-generator’);<br />
(‘/imageGen’, function(req, res, next) {<br />
var c = new Captcha({<br />
length:5, // Captcha length<br />
size:{ // output size<br />
width: 450,<br />
height: 200}});<br />
Base64(function(err, base64){<br />
base64Data = place(/^data:image\/png;base64, /, “”);<br />
base64Data += place(‘+’, ‘ ‘);<br />
(base64Data);<br />
binaryData = new Buffer(base64Data, ‘base64’). toString(‘binary’);<br />
if(err){<br />
(“Captcha Error”);<br />
(err);}<br />
else{<br />
ntentType(‘image/png’);<br />
(binaryData, ‘binary’);}});});<br />
Hope this answer helps, and unlike reCaptcha, no need for a HTTPS certificate for integrating in your website. Perfect for college/hobby projects<br />
answered Jun 26 ’18 at 12:54<br />
answered May 30 ’13 at 7:15<br />
IvanMIvanM2, 5051 gold badge23 silver badges27 bronze badges<br />
0<br />
Not the answer you’re looking for? Browse other questions tagged captcha or ask your own question.</p>
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Tags: amazing captcha golang captcha npm captcha npm captcha solver npm captcha-generator npm svg-captcha svg-captcha example svg-captcha-express
