hugo/docs/content/templates/debugging.md

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Template Debugging

Here are some snippets you can add to your template to answer some common questions. These snippets use the printf function available in all Go templates. This function is an alias to the Go function, fmt.Printf.

What type of page is this?

Does Hugo consider this page to be a "Node" or a "Page"? (Put this snippet at the top level of your template. Don't use it inside of a range loop.)

{{ printf "%T" . }}

What variables are available in this context?

You can use the template syntax, $., to get the top-level template context from anywhere in your template. This will print out all the values under, .Site.

{{ printf "%#v" $.Site }}

This will print out the value of .Permalink, which is available on both Nodes and Pages.

{{ printf "%#v" .Permalink }}

This will print out a list of all the variables scoped to the current context (a.k.a. The dot, ".").

{{ printf "%#v" . }}

When writing a Homepage, what does one of the pages you're looping through look like?

{{ range .Data.Pages }}
    {{/* The context, ".", is now a Page */}}
    {{ printf "%#v" . }}
{{ end }}

Why do I have no variables defined?

Check that you are passing variables in the partial function. For example

{{ partial "header" }}

will render the header partial, but the header partial will not have access to any variables. You need to pass variables explicitly. For example:

{{ partial "header" . }}