Friendly Captcha for
Clojure

Clojure is a modern, functional Lisp dialect for the JVM that emphasizes immutability, simplicity, and robust concurrency. Protect your Clojure applications with a privacy-first Clojure captcha from Friendly Captcha. Stop bots, safeguard user data, and enable seamless, invisible verification.

Field of application/

Backend

Tired of clicking on cars?

Friendly Captcha is the user-friendly way to stop spam and bots - no labeling needed.

Get rid of annoying labeling tasks. Make spam protection easy and privacy compliant.

Happy users, increased conversion rates

With Friendly Captcha no user tasks are needed. It runs automatically in the background.

Fully accessible and WCAG compliant

Don’t exclude any users, Friendly Captcha is entirely barrier-free.

Privacy compliant with GDPR, CCPA, LGPD and PIPL

Friendly Captcha protects users’ privacy at the highest level of data protection.

European servers for maximum data protection

Ensure that your customers’ personal data remains in the EU.

The Clojure Captcha

How the integration works

1.

Create a Friendly Captcha account

Creating an account is completely free, all you need is a valid email address and you’re ready to go. Choose a plan that covers your needs. The first 30 days are free of charge.

2.

Create an 'Application' to get a sitekey

Create an application in the Friendly Captcha dashboard to get a sitekey for your integration, as shown in the screenshot below.

3.

Create an API key to interact with the API

Create an API key in the Friendly Captcha dashboard, as shown in the screenshot below.
Please make sure to copy and save the API key as you can only access it once.

4.

Complete your billing details

To ensure that your account remains functional after the 30-day trial period, make sure to enter your billing information in the Friendly Captcha dashboard.

You can adjust and cancel your Friendly Captcha plan online at any time.

5.

Integrate the source code into your Clojure application

Share the integration code with your developer via the link below to integrate Friendly Captcha into your Clojure application.

				
					https://github.com/FriendlyCaptcha/friendly-captcha-jvm

6.

Connect Friendly Captcha with Clojure

To finish the integration, share with your developer the sitekey generated in step 2 and the API key generated in step 3.

The Friendly Captcha widget will appear in your Clojure frontend.

I'm not a robot

FAQs

What is a Clojure CAPTCHA?

In Clojure applications, a CAPTCHA serves as a gatekeeper, distinguishing real users from automated scripts. It protects interactive elements like forms or APIs from being exploited by bots or spam bots. Friendly Captcha offers a clean, privacy-forward solution that integrates smoothly without disrupting your application’s flow or collecting personal data.

How does Friendly Captcha for Clojure stacks work?

Friendly Captcha performs background cryptographic tasks directly in the browser, requiring no interaction from the user. The client completes a small puzzle that proves the request comes from a human. In your Clojure backend, you simply validate the result. This asynchronous, hands-off approach is a natural match for functional, event-driven design.

What is the best CAPTCHA for Clojure?

The best CAPTCHA for Clojure is Friendly Captcha. It offers a seamless, privacy-focused solution that integrates easily into functional web applications built with Clojure. Unlike traditional CAPTCHAs that rely on user interaction or behavioral tracking, Friendly Captcha uses an invisible proof-of-work mechanism that runs invisibly in the background, ensuring real users can access your app without frustration.

Do I need a CAPTCHA for Clojure?

If your application accepts any kind of user input (logins, comments, registrations, or payments), a CAPTCHA is an essential security feature. Friendly Captcha ensures that only humans can submit forms, invisibly shielding your services from abuse, scraping, and spam without affecting the user experience.

Why should I use a Clojure CAPTCHA?

For Clojure developers seeking minimalist, privacy-conscious tooling, Friendly Captcha stands out. It doesn’t rely on invasive fingerprinting or challenge-response gimmicks. Instead, it uses a transparent and GDPR-compliant verification process, delivering effective security without compromising user trust or functional purity.

How can I integrate Friendly Captcha into my Clojure forms?

The setup is quick: generate your API keys, embed the widget in your frontend, and handle response validation in your Clojure backend, typically via an HTTP endpoint. The workflow is straightforward and can be completed in minutes. Libraries for HTTP handling in Clojure (like Ring or Reitit) work seamlessly with Friendly Captcha’s validation logic.

Is a CAPTCHA for Clojure accessible to all users?

Yes. Friendly Captcha operates behind the scenes, with no visual tasks, buttons, or confusing prompts. This ensures full accessibility for users relying on assistive technologies, aligning with WCAG standards and Clojure’s commitment to creating inclusive, composable systems.

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Privacy matters

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Start your integration

Adding Friendly Captcha takes only minutes and just a few lines of code.