node-red/nodes/core/core/80-template.html

<script type="text/x-red" data-template-name="template">
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                <option value="json">JSON</option>
                <option value="javascript">Javascript</option>
                <option value="css">CSS</option>
                <option value="markdown">Markdown</option>
                <option value="yaml">YAML</option>
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</script>

<script type="text/x-red" 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>
    </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>.
    <p><b>Note: </b>By default, <i>mustache</i> will escape any HTML entities in the values it substitutes.
       To prevent this, use <code>{{{triple}}}</code> braces.
</script>

<script type="text/javascript">
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        defaults: {
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            field: {value:"payload", validate: RED.validators.typedInput("fieldType")},
            fieldType: {value:"msg"},
            format: {value:"handlebars"},
            syntax: {value:"mustache"},
            template: {value:"This is the payload: {{payload}} !"},
            output: {value:"str"}
        },
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        outputs:1,
        icon: "template.png",
        label: function() {
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