Top 7 TypeScript Captcha Projects

friendly-challenge

3 386 6.3 TypeScript

The widget and docs for the proof of work challenge used in Friendly Captcha. Protect your websites and online services from spam and abuse with Friendly Captcha, a privacy-first anti-bot solution.
turnstile

1 204 8.9 TypeScript

🔥 Cloudflare Turnstile integration for Nuxt (by nuxt-modules)

Project mention: Captcha with Nuxt3 | /r/Nuxt | 2023-06-07

SurveyJS

surveyjs.io sponsored

Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
friendly-pow

2 185 0.0 TypeScript

The PoW challenge library used by Friendly Captcha
ngx-turnstile

1 48 5.5 TypeScript

Cloudflare Turnstile for Angular
next-hcaptcha

2 22 0.0 TypeScript

🤖 Robust, dependency free and highly configurable solution for guarding Next.js API Routes through higher order function with HCaptcha
crypto-puzzle

2 18 4.4 TypeScript

A time-lock puzzle generator.

Project mention: mCaptcha: Open-source proof-of-work captcha for websites | news.ycombinator.com | 2023-08-08

Funnily enough I've recently implemented [0] a little proof-of-work generator (or more specifically a time-lock puzzle [1] generator), which is the base building block on top which something like this can be built.
It's a very cool idea imo, you generate a cryptographic puzzle that's cheap for you to make, cheap for you to verify if its solved, and potentially cheap-enough for legitimate users to solve, but expensive-enough that users making too many requests would find solving them prohibitively expensive.
I wish something like this was bolted onto email protocols, it would just cost more to be a spammer than it'd be worth it.
Interesting how mCaptcha seems based on sha256, I don't know enough but it would be worth checking how much the algorithm can be sped up with (already existing) dedicated ASICs, if the attacker can solve the puzzle like 10000x faster than normal users you just can't crank the difficulty of the puzzle high enough and for motivated attackers this becomes basically useless. Basing this of on repeated squarings, like the RSW paper on time-lock puzzles did, seems potentially better.
[0]: https://github.com/fabiospampinato/crypto-puzzle

cloudflare-contact-us-worker

1 5 10.0 TypeScript

Contact Page to send E-mails. Sends requests to Cloudflare Worker. Uses Google Invisible Captcha to reduce spam, Sentry to log errors & SendGrid to send e-mails. TypeScript & a few simple Jest tests. GitHub Workflow is used for automated deployment.
WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

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).