schema.html

<script type="text/javascript">
    /*global RED*/
    RED.nodes.registerType('json-schema', {
        category: 'function',
        inputs: 1,
        outputs: 1,
        color: "#debd5c",
        icon: "function.png",
        paletteLabel: "json schema",
        defaults: {
            name: {
                value: ""
            },
            func: {
                value: ""
            }
        },
        label: function() {
            return this.name || "JSON Schema";
        },
        oneditprepare: function() {
            var that = this;
            this.editor = RED.editor.createEditor({
                id: 'node-input-func-editor',
                mode: 'ace/mode/javascript',
                value: $("#node-input-func").val()
            });
            RED.library.create({
                url: "functions", // where to get the data from
                type: "schema", // the type of object the library is for
                editor: this.editor, // the field name the main text body goes to
                mode: "ace/mode/javascript",
                fields: ['name']
            });
            this.editor.focus();
        },
        oneditsave: function() {
            var annot = this.editor.getSession().getAnnotations();
            this.noerr = 0;
            $("#node-input-noerr").val(0);
            for (var k = 0; k < annot.length; k++) {
                if (annot[k].type === "error") {
                    $("#node-input-noerr").val(annot.length);
                    this.noerr = annot.length;
                }
            }
            $("#node-input-func").val(this.editor.getValue());
            delete this.editor;
        },
        oneditresize: function(size) {
            var rows = $("#dialog-form>div:not(.node-text-editor-row)");
            var height = $("#dialog-form").height();
            for (var i = 0; i < rows.size(); i++) {
                height -= $(rows[i]).outerHeight(true);
            }
            var editorRow = $("#dialog-form>div.node-text-editor-row");
            height -= (parseInt(editorRow.css("marginTop")) + parseInt(editorRow.css("marginBottom")));
            $(".node-text-editor").css("height", height + "px");
            this.editor.resize();
        }
    });
</script>

<script type="text/x-red" data-template-name="json-schema">
    <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>
    <div class="form-row" style="margin-bottom: 0px;">
        <label for="node-input-func"><i class="fa fa-wrench"></i> JSON Schema</label>
        <input type="hidden" id="node-input-func" autofocus="autofocus">
        <input type="hidden" id="node-input-noerr">
    </div>
    <div class="form-row node-text-editor-row">
        <div style="height: 250px;" class="node-text-editor" id="node-input-func-editor"></div>
    </div>
</script>

<script type="text/x-red" data-help-name="json-schema">
    <p>JSON Schema validator</p>
    <p>Put your JSON Schema on editor and node will validate msg.payload. Error is returned on msg.error.</p>
</script>