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    <p>You can use <code>{{ variable }}</code> anywhere in your template, not just in the HTML part. So this should work:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script&gt; var someJavaScriptVar = '{{ geocode[1] }}'; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;p&gt;Hello World&lt;/p&gt; &lt;button onclick="alert('Geocode: {{ geocode[0] }} ' + someJavaScriptVar)" /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Think of it as a two-stage process: First, Jinja (the template engine Flask uses) generates your text output. This gets sent to the user who executes the JavaScript he sees. If you want your Flask variable to be available in JavaScript as an array, you have to generate an array definition in your output:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script&gt; var myGeocode = ['{{ geocode[0] }}', '{{ geocode[1] }}']; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;p&gt;Hello World&lt;/p&gt; &lt;button onclick="alert('Geocode: ' + myGeocode[0] + ' ' + myGeocode[1])" /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Jinja also offers more advanced constructs from Python, so you can shorten it to:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script&gt; var myGeocode = [{{ ', '.join(geocode) }}]; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;p&gt;Hello World&lt;/p&gt; &lt;button onclick="alert('Geocode: ' + myGeocode[0] + ' ' + myGeocode[1])" /&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>You can also use <code>for</code> loops, <code>if</code> statements and many more, see the <a href="http://jinja.pocoo.org/docs/" rel="nofollow noreferrer">Jinja2 documentation</a> for more. </p> <p>Also have a look at ford's answer who points out the <a href="http://flask.pocoo.org/docs/0.10/templating/#standard-filters" rel="nofollow noreferrer"><code>tojson</code></a> filter which is an addition to <a href="http://jinja.pocoo.org/docs/dev/templates/#builtin-filters" rel="nofollow noreferrer">Jinja2's standard set of filters</a>.</p>
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    1. POHow can I pass data from Flask to JavaScript in a template?
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    1. POHow can I pass data from Flask to JavaScript in a template?
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    1. COMuch obliged, mensi! That was my initial thought but the documentation for Flask doesn't make it readily clear that you can use the {{var}} form in JS as well. Thanks for clearing that up.
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    2. CO@mea: you can also use the template engine to generate arbitrary text-based files, I have also used it to dynamically generate TeX files (-> PDF) and email, it's quite versatile ;)
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    3. COquick follow up question: if I do a for loop in JS, can I use the index variable within the python variable e.g. {{geocode[i]}} ?
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