How to update json from within html?

First of all, I will state the obvious: I suck at html. My javascript coding is on par, but I am just now discovering the severe limitations of js inside html.

Case: my node.js applications output an errorlog to json. I have made a dynamic html table to sort and display those errors, all of that is working very well.

However, when I have dealt with those errors, I would like to have a button on said html page to overwrite the json file with [], effectively making it blank again.

Now, in node.js this is easy peasy with fs, but no such thing inside html. To read the json I resort to XMLhttprequest.

I'm pretty sure the answer will be that I can not change data on the server from client-side. That would make sense, but are there workarounds?

<script>
    Parser();
    setInterval(function(){Parser()}, 300 * 1000)

    function Parser() {
        getJSON("Errors.json", function(err, data) {
            let array           = data;
            let titles          = ["Time", "Program", "", "Count", "Info", "Error"];
            let text            = [];
            let joined          = [];

            let table           = document.createElement("table");
            let tr              = table.insertRow(-1);
            for (let i in titles) {
                let th          = document.createElement("th");
                    th.innerHTML = titles[i];
                    tr.appendChild(th);
            }

            for (let i in array) {
                let count = 0;
                array[i].count = 1;
                for (let x in joined) {
                    let ar = array[i], jn = joined[x];
                    if (ar.file == jn.file && ar.line == jn.line && ar.info == jn.info && ar.message == jn.message){
                        count++;
                        jn.count++;
                    }
                }
                if (count == 0) joined.push(array[i])
            }
            for (let i in joined) {
                let tx          = joined[i]
                    text[0]     = tx.time;
                    text[1]     = tx.file;
                    text[2]     = tx.line;
                    text[3]     = "("+tx.count+"x)";
                    text[4]     = tx.info;
                    text[5]     = tx.message;

                tr = table.insertRow(-1);
                for (let j in text) {
                    let tabCell = tr.insertCell(-1);
                        tabCell.innerHTML = text[j];
                }
            }

            let Table = document.getElementById("table");
                Table.innerHTML = "";
                Table.appendChild(table);
        });
    };

    function getJSON(url, callback) {
        let xhr = new XMLHttpRequest();
        xhr.open("GET", url, true);
        xhr.responseType = "json";
        xhr.onload = function() {
          let status = xhr.status;
          if (status === 200) {
            callback(null, xhr.response);
          } else {
            callback(status, xhr.response);
          }
        };
        xhr.send();
    };
</script>