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Action functions let your backend script perform side-effects — set session data, cookies, redirect the visitor, inject template variables, or send custom responses.

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Session

Read and write values in the visitor’s server-side session. 
session.set('my_key', 'my_value');
session.set('visit_count', 5);

var count = session.get('visit_count');  // 5
var missing = session.get('nonexistent'); // null
Session values set here are immediately available to funnel script rules that run after the backend script.
Session keys and values should be simple types (strings, numbers, booleans). Complex objects are serialized as JSON internally.
For security, some session keys are reserved and cannot be read or written via session.get() / session.set(). Use your own key names (e.g. my_key, visit_count) for custom data.

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Cookies

Set or delete cookies on the visitor’s browser. 
cookie.set('promo_seen', 'true', { maxAge: 3600, path: '/' });
cookie.delete('old_cookie');
OptionTypeDescription
maxAgenumberCookie lifetime in seconds
pathstringCookie path (default: '/')
Clears the cookie by name.
Some cookie names are reserved and cannot be set or deleted. Use your own cookie names for custom data.

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Redirect

Redirect the visitor to a different URL. This stops page rendering — the visitor is immediately sent to the new URL. 
redirect('/login');           // 302 temporary redirect
redirect('/new-page', 301);   // 301 permanent redirect
redirect('https://example.com/page'); // external redirect
When redirect() is called, the entire funnel flow and page rendering are skipped. The visitor receives only the redirect response.
Only relative paths (/path) and http:// / https:// URLs are allowed. Other schemes (e.g., javascript:, data:) are blocked for security.

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Template Variables

Inject values into the template engine. These become available as {{ var.key }} in page HTML. 
setVariable('discount', '50%');
setVariable('show_banner', true);
setVariable('user_tier', 'premium');
In your page HTML: 
<h1>Get {{ var.discount }} off!</h1>

@if(var.show_banner)
  <div class="banner">Premium member</div>
@endif
Variables set with setVariable take precedence over brand variables with the same key.

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Response Headers

Set custom HTTP response headers. 
setHeader('X-Custom-Header', 'my-value');
setHeader('Cache-Control', 'no-store');
For security, certain response headers cannot be set (e.g. those that control cookies, CORS, or connection). Header values are sanitized.

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Custom Response

Send a custom response instead of the rendered page. These stop page rendering.

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response.status(code)

Set the HTTP status code (used with response.send() or response.json(), or with the normal page render). 
response.status(403);
response.send('<h1>Access Denied</h1>');

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response.json(data)

Send a JSON response. Skips page rendering. 
response.json({ error: false, user: customer.email });

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response.send(html)

Send raw HTML. Skips page rendering. 
response.send('<html><body><h1>Maintenance</h1></body></html>');

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Logging and errors

console.log, console.info, console.warn, and console.error are captured and stored in execution logs. Use them for debugging. 
console.log('Visitor IP:', request.ip);
console.log('Customer:', customer);
Logs and errors are visible in the Debug Window (Page Events tab) for the page request. If your script throws an error or times out, the visitor still receives the normal page (no error message is shown); the error is logged there and may be reported to admins.