node-red/nodes/core/storage/50-file.html

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<script type="text/x-red" data-template-name="file">
    <div class="form-row node-input-filename">
         <label for="node-input-filename"><i class="icon-file"></i> Filename</label>
         <input type="text" id="node-input-filename" placeholder="Filename">
    </div>
    <div class="form-row">
        <label>&nbsp;</label>
        <input type="checkbox" id="node-input-appendNewline" placeholder="Name" style="display: inline-block; width: auto; vertical-align: top;">
        <label for="node-input-appendNewline" style="width: 70%;">Append newline ?</label>
    </div>
    <div class="form-row">
        <label>&nbsp;</label>
        <input type="checkbox" id="node-input-overwriteFile" placeholder="Name" style="display: inline-block; width: auto; vertical-align: top;">
        <label for="node-input-overwriteFile" style="width: 70%;">Overwrite complete file ?</label>
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="icon-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
</script>

<script type="text/x-red" data-help-name="file">
	<p>Writes <b>msg.payload</b> to the file specified, e.g. to create a log.</p>
	<p>The filename can be overridden by the <code>filename</code> property 
	of the incoming message.</p> 
	<p>A newline is added to every message. But this can be turned off if required, for example, to allow binary files to be written.</p>
	<p>The default behaviour is to append to the file. This can be changed to overwrite the file each time, for example if you want to output a "static" web page or report.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('file',{
        category: 'storage-output',
        defaults: {
            name: {value:""},
            filename: {value:""},
            appendNewline: {value:true},
            overwriteFile: {value:false}
        },
        color:"BurlyWood",
        inputs:1,
        outputs:0,
        icon: "file.png",
        align: "right",
        label: function() {
            return this.name||this.filename;
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });

</script>