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Top 13 JavaScript Captcha Projects
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Civic Auth
Auth in Less Than 5 Minutes. Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
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nopecha-extension
Automated CAPTCHA solver for your browser. Works with Selenium, Puppeteer, Playwright, and more. (by NopeCHALLC)
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challenge-bypass-extension
DEPRECATED - Client for Privacy Pass protocol providing unlinkable cryptographic tokens
Project mention: Obscura VPN – Privacy that's more than a promise | news.ycombinator.com | 2025-02-19I can understand that concern, and I think in the future some version of [Privacy Pass](https://privacypass.github.io/) will allow for site operators to differentiate between normal vs. abusive users without relying on IP reputation (which is more unreliable anyway since CGNAT is a thing).
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ALTCHA
GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism and advanced anti-spam filter.
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Project mention: hCaptcha, a bot detection tool, usage in Supabase and Chatwoot | dev.to | 2024-12-27
react-hcaptcha
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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pow-bot-deterrent
A proof-of-work based bot deterrent. Lightweight, self-hosted and copyleft licensed.
Project mention: Pow-bot-deterrent: A proof-of-work based bot deterrent | news.ycombinator.com | 2025-03-21 -
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EasyCaptchaJS
EasyCaptchaJS is a lightweight and user-friendly jQuery/JS library that simplifies the integration of Google reCAPTCHA API into web pages. With EasyCaptchaJS, developers can effortlessly add the security and anti-bot protection of reCAPTCHA to their web applications, enhancing their overall security and user experience.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
JavaScript Captcha discussion
JavaScript Captcha related posts
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Pow-bot-deterrent: A proof-of-work based bot deterrent
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Altcha – privacy-friendly captcha alternative
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Altcha – free, open-source Captcha alternative
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Open source GDPR compliant alternative for Recaptcha and CF Turnstile
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Buster: Captcha Solver for Humans
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Flagship Mastodon instance to require AI disclosure; bans AI-only accounts
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Cloudflare verification not working
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A note from our sponsor - InfluxDB
influxdata.com | 28 Apr 2025
Index
What are some of the best open-source Captcha projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | buster | 8,447 |
| 2 | nopecha-extension | 7,664 |
| 3 | svg-captcha | 1,886 |
| 4 | challenge-bypass-extension | 1,250 |
| 5 | ALTCHA | 804 |
| 6 | react-hcaptcha | 397 |
| 7 | userscripts | 298 |
| 8 | SliderCaptcha | 280 |
| 9 | recaptcha-module | 254 |
| 10 | pow-bot-deterrent | 197 |
| 11 | TmsCaptchaSolver | 27 |
| 12 | EasyCaptchaJS | 15 |
| 13 | rsc-captcha | 11 |
Sponsored
Auth in Less Than 5 Minutes
Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
www.civic.com