Params in Hugo

Boolean

In config.yaml

params:
  display_toc: true

In Front Matter

---
display_toc: true
---

Template

<h2>Title</h2>

{{ if .Param "display_toc" }}
  {{ .TableOfContents }}
{{ end }}

<p>Lorem ipsum...</p>

String

In config.yaml

params:
  mood: "happy"

In Front Matter

---
mood: "happy"
---

Template

<p>How are you feeling today?</p>

<p>I'm feeling {{ if .Params.mood }}{{ .Params.mood }}{{ end }} today.</p>

with default:

<p>How are you feeling today?</p>

<p>I'm feeling {{ .Params.mood | default "so-so" }} today.</p>

Ref

1. .Param Function in Hugo
2. How to use template parameters in page content in hugo