hugo/docs/content/en/methods/page/Param.md

title	description	categories	keywords	action	aliases
Param	Returns a page parameter with the given key, falling back to a site parameter if present.			related returnType signatures any PAGE.Param KEY	/functions/param

The Param method on a Page object looks for the given KEY in page parameters, and returns the corresponding value. If it cannot find the KEY in page parameters, it looks for the KEY in site parameters. If it cannot find the KEY in either location, the Param method returns nil.

Site and theme developers commonly set parameters at the site level, allowing content authors to override those parameters at the page level.

For example, to show a table of contents on every page, but allow authors to hide the table of contents as needed:

Configuration:

{{< code-toggle file=hugo >}} [params] display_toc = true {{< /code-toggle >}}

Content:

{{< code-toggle file=content/example.md fm=true >}} title = 'Example' date = 2023-01-01 draft = false display_toc = false {{< /code-toggle >}}

Template:

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

The Param method returns the value associated with the given KEY, regardless of whether the value is truthy or falsy. If you need to ignore falsy values, use this construct instead:

{{ or .Params.foo site.Params.foo }}