# How to modify the preview with javascript?

**URL:** https://meta.discourse.org/t/how-to-modify-the-preview-with-javascript/182563
**Category:** Development
**Created:** [March 8, 2021, 10:18pm UTC](https://meta.discourse.org/t/how-to-modify-the-preview-with-javascript/182563 "2021-03-08T22:18:01Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![Falco](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/falco/32/179432_2.png) [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [March 8, 2021, 11:24pm UTC](https://meta.discourse.org/t/how-to-modify-the-preview-with-javascript/182563/4 "2021-03-08T23:24:16Z")

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The submitted post will be cooked again in the server, so in order for the modification to work, you will need a plugin, not a theme-component.

This post here covers this topic: [Repackaging a markdown-it extension as a Discourse plugin](https://meta.discourse.org/t/repackaging-a-markdown-it-extension-as-a-discourse-plugin/84614)

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_[View the full topic](https://meta.discourse.org/t/how-to-modify-the-preview-with-javascript/182563)._