Skip to main content
Free trial
Login
Official Browser integration

JavaScript logo
JavaScript CAPTCHA

Protect custom forms, legacy front-ends, and manual widget renders in JavaScript with a privacy-friendly CAPTCHA that fits modern front-end stacks cleanly and makes the switch from reCAPTCHA or hCaptcha straightforward.

Start a free trial
JavaScript logo
What is JavaScript?

JavaScript is the baseline language for interactive browser experiences and custom front-end integrations.

Why choose CaptchaFox for JavaScript?

CaptchaFox fits cleanly into JavaScript, protects custom forms, legacy front-ends, and manual widget renders with a privacy-first CAPTCHA, and gives front-end teams a clearly better alternative to reCAPTCHA or hCaptcha.

Why choose CaptchaFox for JavaScript?

Use the CaptchaFox browser API to protect plain JavaScript forms, custom widgets, and legacy front-ends.

Privacy-friendly

Protect custom forms, legacy front-ends, and manual widget renders in JavaScript with privacy-first bot protection for real users. CaptchaFox is compliant with GDPR and CCPA.

Easy to integrate

CaptchaFox gives your team a drop-in integration with extensive documentation, so JavaScript is quick to implement and easy to migrate from reCAPTCHA or hCaptcha.

User-friendly and accessible

Reduce friction for real users in JavaScript. CaptchaFox is WCAG 2.2 AA compliant and avoids difficult challenges or image-puzzle style CAPTCHA flows.

Strong bot protection

Block spam, fake requests, credential abuse, and automated submissions across custom forms, legacy front-ends, and manual widget renders.

Set up CaptchaFox in JavaScript in 5 steps

You can add CaptchaFox to JavaScript in only a few minutes.

  1. Step 1

    Create account

    Create a free CaptchaFox account so you can add sites, manage keys, and review bot traffic.

  2. Step 2

    Create a site and receive your keys

    Add your JavaScript domain or application in the dashboard. CaptchaFox then provides a site key for the front end or module and a secret key for verification.

  3. Step 3

    Install the integration

    Install the JavaScript integration using the official setup guide and enable CaptchaFox for the relevant flows.

    Start integration
  4. Step 4

    Activate the CAPTCHA

    Paste the site key and secret key into your front-end markup, widget callbacks, and the server endpoint that validates response tokens.

  5. Step 5

    Your JavaScript application is protected by CaptchaFox!

    Your application is now protected, and you can integrate CaptchaFox into additional forms or other domains.

Related integrations

  • Angular logo

    Angular

    Angular is a framework for structured, large-scale web applications with strong TypeScript tooling.

  • Next.js logo

    Next.js

    Next.js is a React framework for server-rendered, static, and hybrid web applications with strong SEO and performance tooling.

  • Electron logo

    Electron

    Electron is a framework for building desktop applications with web technologies such as JavaScript, React, and Node.js.

FAQ

Why should I protect JavaScript with a CAPTCHA?
JavaScript handles public and sensitive flows such as custom forms, legacy front-ends, and manual widget renders. A CAPTCHA stops spam, fake requests, credential stuffing, and automated abuse before it reaches your forms, logins, or registrations.
What is the best JavaScript CAPTCHA?
The best CAPTCHA for JavaScript blocks bots without forcing real users through image puzzles or unnecessary friction. It is privacy-friendly, accessible, and fast to integrate. That is exactly what CaptchaFox delivers.
Is CaptchaFox accessible for JavaScript?
CaptchaFox is designed to minimize friction for real users. In JavaScript, that means a more accessible CAPTCHA experience focused on usability instead of difficult challenges or image-puzzle style friction.
Is CaptchaFox privacy-friendly for JavaScript?
Yes. CaptchaFox is a privacy-friendly CAPTCHA alternative. When you secure JavaScript with CaptchaFox, you use bot protection designed for privacy and strict data protection requirements.
How fast can I integrate CaptchaFox with JavaScript?
The technical setup is straightforward: create an account, add a site, install the integration, connect the keys, and test the flow. This page shows the setup path for JavaScript and links directly to the right guide.

Fight bots and protect your users' data.

Don't give fraudsters and spammers a chance and protect your website with CaptchaFox today.

Get started for free
Contact us
Device protection