---
title: "Build-your-own (Nunjucks scripted) Post function"
canonical: "https://support.appfire.com/space/JMWEC/466289991/Build-your-own%20(Nunjucks%20scripted)%20Post%20function"
format: markdown
---
> Macro (aura-html)

> Macro (excerpt)
> 
> This post function allows you to run an Nunjucks template (script) when a transition is triggered. This can be used to create entirely custom own post functions.

![Scripted post function configuration screen](media://a54c2fdb-8ee5-42e2-9a8e-6d51fb2ffb8f)

**To add the 'Build-your-own (Nunjucks scripted)' post function to a transition: **

1. Click **Edit** for the workflow that has the transition to which you wish to add the post function.
2. In the Workflow Designer, select the transition.
3. Click **Post Functions** in the properties panel.
4. Click **Add post function**.
5. Select **Build-your-own (scripted) Post-function** from the list of post function.
6. Click **Add** to navigate to the *Build-your-own (Nunjucks scripted) Post-function *screen where you can add configuration details. See below for more information.
7. Click on **Add** to add the post function to the transition.