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="fa fa-file"></i> Filename</label>
         <input type="text" id="node-input-filename" placeholder="Filename">
    </div>
    <div class="form-row">
        <label for="node-input-overwriteFile"><i class="fa fa-random"></i> Action</label>
        <select type="text" id="node-input-overwriteFile" style="display: inline-block; width: 250px; vertical-align: top;">
            <option value="false">append to file</option>
            <option value="true">overwrite file</option>
            <option value="delete">delete file</option>
        </select>
    </div>
    <div class="form-row" id="node-appline">
        <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%;">Add newline (\n) to each payload ?</label>
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-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 configured in the node, if left blank it should be set in an incoming message on <b>msg.filename</b>.</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>
    <p>This node can also be configured to delete a file if required. <i>Note:</i> Using msg.delete is now deprecated.</p>
</script>

<script type="text/x-red" data-template-name="file in">
    <div class="form-row">
         <label for="node-input-filename"><i class="fa fa-file"></i> Filename</label>
         <input type="text" id="node-input-filename" placeholder="Filename">
    </div>
    <div class="form-row">
        <label for="node-input-format"><i class="fa fa-sign-out"></i> Output as</label>
        <select id="node-input-format">
            <option value="utf8">a utf8 string</option>
            <option value="">a Buffer</option>
        </select>
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
</script>

<script type="text/x-red" data-help-name="file in">
    <p>Reads the specified file and sends the content as <b>msg.payload</b>, and the filename as <b>msg.filename</b>.</p>
    <p>The filename can be configured in the node, if left blank it should be set in an incoming message on <b>msg.filename</b>.</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() {
            if (this.overwriteFile === "delete") { return this.name||"delete "+this.filename; }
            else { return this.name||this.filename; }
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        },
        oneditprepare: function() {
          $("#node-input-overwriteFile").on("change",function() {
            if (this.value === "delete") { $("#node-appline").hide(); }
            else { $("#node-appline").show(); }
          });
        }
    });

    RED.nodes.registerType('file in',{
        category: 'storage-input',
        defaults: {
            name: {value:""},
            filename: {value:""},
            format: {value:"utf8"},
        },
        color:"BurlyWood",
        inputs:1,
        outputs:1,
        icon: "file.png",
        label: function() {
            return this.name||this.filename;
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });

</script>