Jekyll filter: Use Liquid in front-matter

August 9, 2016

Jekyll’s template language Liquid is pretty powerful. We especially use Liquid objects to access different data across all pages, like


{{ site.data.placeholder.product-name }}

instead of the product name itself. However, we can’t use these objects in front-matter, where we would define titles and other meta information:


---
title: How to install {{ site.data.placeholder.product-name }}
---

Not possible. Well, not without a little help at least. Here’s a nice filter that parses Liquid objects when used within Jekyll front-matter:

module LiquidFilter
  def liquify(input)
    Liquid::Template.parse(input).render(@context)
  end
end
Liquid::Template.register_filter(LiquidFilter)

Use it with


{{ page.title | liquify }}

Anywhere in your layouts.

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