node-red/packages/node_modules/@node-red/nodes/locales/en-US/function/80-template.html

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<script type="text/html" data-help-name="template">
    <p>Sets a property based on the provided template.</p>
    <h3>Inputs</h3>
    <dl class="message-properties">
        <dt>msg <span class="property-type">object</span></dt>
        <dd>A msg object containing information to populate the template.</dd>
        <dt class="optional">template <span class="property-type">string</span></dt>
        <dd>A template to be populated from <code>msg.payload</code>. If not configured in the edit panel,
         this can be set as a property of msg.</dd>
    </dl>
    <h3>Outputs</h3>
    <dl class="message-properties">
        <dt>msg <span class="property-type">object</span></dt>
        <dd>a msg with a property set by populating the configured template with properties from the incoming msg.</dd>
    </dl>
    <h3>Details</h3>
    <p>By default this uses the <i><a href="http://mustache.github.io/mustache.5.html" target="_blank">mustache</a></i>
    format, but this can be switched off if required.</p>
    <p>For example, when a template of:
    <pre>Hello {{payload.name}}. Today is {{date}}</pre>
    <p>receives a message containing:
    <pre>{
  date: "Monday",
  payload: {
    name: "Fred"
  }
}</pre>
    <p>The resulting property will be:
    <pre>Hello Fred. Today is Monday</pre>
    <p>It is possible to use a property from the flow context or global context. Just use <code>{{flow.name}}</code> or
    <code>{{global.name}}</code>, or for persistable store <code>store</code> use <code>{{flow[store].name}}</code> or
    <code>{{global[store].name}}</code>.
    <p><b>Note: </b>By default, <i>mustache</i> will escape any non-alphanumeric or HTML entities in the values it substitutes.
       To prevent this, use <code>{{{triple}}}</code> braces.</p>
    <p>If you need to use <code>{{ }}</code> within your content, you can change the characters
       used to mark the templated sections. For example, to use <code>[[ ]]</code>
       instead, add the following line to the top of the template:</p>
    <pre>{{=[[ ]]=}}</pre>
    <h4>Using environment variables</h4>
    <p>The template node can access environment variables using the syntax:</p>
    <pre>My favourite colour is {{env.COLOUR}}.</pre>
</script>