> ## Documentation Index
> Fetch the complete documentation index at: https://ngrok.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Variables

> Reference documentation for Traffic Policy variables used in expressions and CEL interpolation to access traffic and connection metadata.

ngrok provides a set of variables that you can use in Traffic Policy to:

* **Conditionally handle traffic** through [Expressions](/traffic-policy/how-it-works#expressions).
* **Dynamically configure actions** using [CEL interpolation](/traffic-policy/how-it-works#cel-interpolation).
* **Debug traffic flows** via actions like [`log`](/traffic-policy/actions/log) or [`custom-response`](/traffic-policy/actions/custom-response).

### Available variables:

* [Action Variables](/traffic-policy/variables/action)
* [Connection Variables](/traffic-policy/variables/connection)
  * [GeoIP Variables](/traffic-policy/variables/connection#connection-geo-variables)
  * [IP Intelligence Variables](/traffic-policy/variables/ip-intel)
    * [IP Categories](/traffic-policy/variables/ip-intel/#ip-categories)
  * [TLS Variables](/traffic-policy/variables/connection#connection-tls-variables)
* [Endpoint Variables](/traffic-policy/variables/endpoint)
* [Request Variables](/traffic-policy/variables/req)
* [Response Variables](/traffic-policy/variables/res)
* [Time Variables](/traffic-policy/variables/time)