Using functions on the Azion Web Platform allows you to have closer and faster communication with users. By making use of JavaScript, you’re able to effectively perform tasks that have a great impact on people’s lives and business on a daily basis.

This collection gathers ready-to-use JavaScript snippets that show common patterns for functions, from returning a simple response or JSON payload to redirecting traffic, reading cookies, running A/B tests, and applying firewall rules based on GeoIP data. The examples are grouped by where they run: functions that respond to the fetch event in applications, and functions that handle the firewall event for security and request control. To use any of them, copy the code into a function and deploy it on Azion, optionally customizing behavior through args so the same logic can be reused across instances.

Functions - Applications

A/B testing

Extract cookie value

Hello World

Redirect all requests to one URL

Respond with another site

Rest APIs

Return HTML

Return JSON

Using args

Functions - Firewall

Adding a response header

Deny a request based on Geoip

General functions on firewall example