node-red-nodes/parsers/base64/70-base64.html

<script type="text/x-red" data-template-name="base64">
    <div class="form-row">
        <label for="node-input-action"><i class="fa fa-dot-circle-o"></i> Action</label>
        <select style="width:70%" id="node-input-action">
            <option value="">Convert Buffer <-> Base64</option>
            <option value="str">Convert String to Base64</option>
            <option value="b64">Convert Base64 to String</option>
        </select>
    </div>
    <div class="form-row">
        <label for="node-input-property"><i class="fa fa-ellipsis-h"></i> <span data-i18n="node-red:common.label.property"></span></label>
        <input type="text" id="node-input-property" style="width:70%;"/>
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="node-red:common.label.name"></span></label>
        <input type="text" id="node-input-name" data-i18n="[placeholder]node-red:common.label.name">
    </div>
</script>

<script type="text/x-red" data-help-name="base64">
    <p>A function that converts the chosen property (default <code>msg.payload</code>) to and from base64 format.</p>
    <p>If the input is a buffer it converts it to a Base64 encoded string.</p>
    <p>If the input is a Base64 string it converts it back to a binary buffer.</p>
    <p>You can also fix conversion string to base64,and base64 to string if required.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('base64',{
        category: 'function',
        color:"#DEBD5C",
        defaults: {
            name: {value:""},
            action: {value:""},
            property: {value:"payload",required:true}
        },
        inputs:1,
        outputs:1,
        icon: "arrow-in.png",
        label: function() {
            return this.name||"base64";
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        },
        oneditprepare: function() {
            if (this.property === undefined) {
                $("#node-input-property").val("payload");
            }
            $("#node-input-property").typedInput({default:'msg',types:['msg']});
        }
    });
</script>