Hugo SEO Markup

hugo_seo.html

    <meta name="description" content="{{ if .IsHome }}{{ .Site.Params.description }}{{ else }}{{ .Description }}{{ end }}"/>
    <meta name="robots" content="noodp"/>
    <link rel="canonical" href="{{ .Permalink }}" />

    <!-- Twitter Card -->
    <meta name="twitter:card" content="summary" />
    <meta name="twitter:description" content="{{ if .IsHome }}{{ .Site.Params.description }}{{ else }}{{ .Description }}{{ end }}" />
    <meta name="twitter:title" content="{{ .Title }}{{ if .IsHome }} - {{ .Site.Params.Tagline }}{{ else }} - {{ .Site.Title }}{{ end }}" />
    <meta name="twitter:site" content="{{ .Site.Params.twitter }}" />
    <meta name="twitter:creator" content="{{ .Site.Params.twitter }}" />

    <!-- OG data -->
    <meta property="og:locale" content="en_US" />
    <meta property="og:type" content="{{ if .IsPage }}article{{ else }}website{{ end }}" />
    <meta content="{{ .Title }}{{ if .IsHome }} - {{ .Site.Params.Tagline }}{{ else }} - {{ .Site.Title }}{{ end }}" property="og:title">
    <meta content="{{ if .IsHome }}{{ .Site.Params.description }}{{ else }}{{ .Description }}{{ end }}" property="og:description">
    <meta property="og:url" content="{{ .Permalink }}" />
    <meta property="og:site_name" content="{{ .Site.Title }}" />
    {{ range .Params.categories }}<meta property="article:section" content="{{ . }}" />{{ end }}
    {{ if isset .Params "date" }}<meta property="article:published_time" content="{{ time .Date }}" />{{ end }}
    
    <!-- JSON-LD -->
    {{ if .IsHome }}
    <script type="application/ld+json">
    { 
      "@context": "http://schema.org", 
      "@type": "WebSite", 
      "url": "{{ .Permalink }}", 
      "name": "{{ .Site.Title }}",
       "author": {
          "@type": "Person",
          "name": "{{ .Site.Params.author }}"
        },
      "description": "{{ .Site.Params.description }}",
    }
    </script>
    {{ end }}
    {{ if .IsPage }}
        <script type="application/ld+json">
        {{if eq .Section "post"}}
        { 
            "@context": "http://schema.org", 
            "@type": "BlogPosting",
            "headline": "{{ .Title }}",
            "genre": "{{ range .Params.categories }}{{ . }}{{ end }}",  
            "url": "{{ .Permalink }}",
            "datePublished": "{{ time .Date }}",
            "description": "{{ .Description }}",
            "author": {
                "@type": "Person",
                "name": "{{ .Site.Params.author }}"
            }
         }
        {{ else }}
        { 
          "@context": "http://schema.org", 
          "@type": "WebSite", 
          "url": "{{ .Permalink }}", 
          "name": "{{ .Title }}",
           "author": {
              "@type": "Person",
              "name": "{ .Site.Params.author }}"
            },
          "description": "{ .Site.Params.description }}",
        }
        {{ end }}
        </script>
    {{ end }}

This was forever ago but wanted to say thanks for pointing out those few issues, oddly enough it compiled without errors at the time. Anyway, I sort of fell of the grid shortly after posting this which is why I'm only just correcting the Gist and responding now. Thanks!

sorry, how to use it for hugo site?

I want to first point out that this is several years old so I can't guaranty it's validity. That said, it might help to have a look at it within the context of the theme I use it in - https://github.com/jeremyjaymes/jeremyjaymes.com/blob/master/themes/j/layouts/partials/seo.html

The template is used as a partial and called in the theme header, it then pulls in the necessary data depending on where you are within the site - e.g. a post page would output the relevant post data - title, publish date, etc.