ethanyoo.com/themes/geronimo/layouts/_default/index.json

{{/* layouts/_default/index.json */}}
{{- $index := slice -}}
{{- range where .Site.RegularPages.ByDate.Reverse "Type" "not in"  (slice "page" "json") -}}
	{{ if .Params.dateCreated }}
			{{ $.Scratch.Set "date" (.Params.dateCreated) }}
	{{ else }}
			{{- if isset site.Params "dateFmt" -}}
				{{- $.Scratch.Set "date" (.Date.Format .Site.Params.dateFmt) -}}
			{{- else -}}
				{{- $.Scratch.Set "date" (.Date.Format "2006-01-02") -}}
			{{- end -}}
	{{ end }}
	{{- $index = $index | append (dict "title" ( .Title | plainify ) "permalink" .Permalink "tags" .Params.tags "description" (.Params.description | markdownify | htmlUnescape | plainify) "date" ($.Scratch.Get "date") ) -}}
{{- end -}}
{{- $index | jsonify -}}