CAPTCHA Types

Serve different types of CAPTCHA by setting the captchaType to frictionless, pow, image.

Frictionless CAPTCHA

Section titled Frictionless CAPTCHA

Procaptcha’s default frictionless feature dynamically detects if the user is using a normal browser or automated, headless browsers such as playwright or selenium. If the user is likely to be a bot, the user will be presented with an image CAPTCHA challenge. If the user is likely to be a human, the user will not be presented with an image CAPTCHA challenge and will instead solve a simple, invisible Proof of Work (PoW) challenge.

Proof of Work (PoW) CAPTCHA

Section titled Proof of Work (PoW) CAPTCHA

A Proof of Work (pow) CAPTCHA challenge requires the user to solve a computational puzzle before submitting the form. It is easy for humans to solve but computationally expensive for bots.

The Proof of Work CAPTCHA type does not interrogate the user’s browser environment, use frictionless for that (above).

Image CAPTCHA

Section titled Image CAPTCHA

An image CAPTCHA challenge requires the user to select the correct image(s) that match the given prompt.

The Image CAPTCHA type does not interrogate the user’s browser environment, use frictionless for that (above).

Set Type Implicitly

Section titled Set Type Implicitly

1. Set the type in the widget configuration

Section titled 1. Set the type in the widget configuration

Here we are setting the captchaType to Proof-of-Work pow.

<div class="procaptcha" data-sitekey="your_site_key" data-captcha-type="pow"></div>

2. Set the type in the portal

Section titled 2. Set the type in the portal

Navigate to the Prosopo portal and update the CAPTCHA type in the settings to pow.

Set Type Explicitly

Section titled Set Type Explicitly

1. Set the type in the widget configuration

Section titled 1. Set the type in the widget configuration

Here we are setting the captchaType to Image image.

document.getElementById('procaptcha-script').addEventListener('load', function () {
    function onCaptchaVerified(output) {
        console.log('Captcha verified, output: ' + JSON.stringify(output))
    }
    // Get the Element using elementId
    const captchaContainer = document.getElementById('procaptcha-container')
    window.procaptcha.render(captchaContainer, {
        siteKey: 'YOUR_SITE_KEY',
        theme: 'dark',
        callback: onCaptchaVerified,
        captchaType: 'image', // `pow` or leave blank for `frictionless`
    })
})

2. Set the type in the portal

Section titled 2. Set the type in the portal

Navigate to the Prosopo portal and update the CAPTCHA type in the settings to image.