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YAML is Fussy About Formating
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<p class="page__lead">YAML, a markup language, is used in GitHubPages, Jekyll and many other static website generators for configuation information, front matter in posts, and defining data.
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<meta itemprop="description" content="YAML, a markup language, is used in GitHubPages, Jekyll and many other static website generators for configuation information, front matter in posts, and defining data.">
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<p>YAML, a markup language, is used in GitHubPages, Jekyll and many other static website generators for configuation information, front matter in posts, and defining data.</p>
<p>YAML is fussy about formating and can be the cause of build errors in GitHub Page sites and Jekyll sites.</p>
<p>Bad YAML Example</p>
<figure class="highlight"><pre><code class="language-yaml" data-lang="yaml"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
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15</pre></td><td class="code"><pre><span class="nn">---</span> <span class="c1"># Tags for posts</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">github</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">GitHub</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">github-pages</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">GitHub Pages</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">jekyll</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">Jekyll</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">that-conference-2015</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">That Conference 2015</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">yaml</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">YAML</span><span class="w">
</span></pre></td></tr></tbody></table></code></pre></figure>
<p>The miss-alignment of the indents in the first two tags can be the cause Page Build Failure emails from GitHubPages, or
this error when perfoming a jeykyll build command:</p>
<blockquote>
<p>jekyll 2.5.3 | Error: (/_data/tags.yml):
mapping values are not allowed in this context at line 3 column 8</p>
</blockquote>
<p>Fortunalty there are a couple of YAML “Linting” tools online to help.</p>
<p><a href="http://www.yamllint.com/">YAML Lint</a></p>
<p><a href="http://codebeautify.org/yaml-validator">YAML Validator</a></p>
<p>Corrected YAML Example</p>
<figure class="highlight"><pre><code class="language-yaml" data-lang="yaml"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
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15</pre></td><td class="code"><pre><span class="nn">---</span> <span class="c1"># Tags for posts</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">github</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">GitHub</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">github-pages</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">GitHub Pages</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">jekyll</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">Jekyll</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">that-conference-2015</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">That Conference 2015</span>
<span class="pi">-</span> <span class="s">slug</span><span class="pi">:</span> <span class="s">yaml</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">YAML</span> <span class="w">
</span></pre></td></tr></tbody></table></code></pre></figure>
<p>YAML is fussy about formating and can be the cause of build errors. Hard lesson learned. Hopefully this helps.</p>
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