main.js

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
        integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
        crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"
        integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo"
        crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"
        integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI"
        crossorigin="anonymous"></script>
        <script>
            function getAndUpdate(){
                console.log("Updating List...");
                tit = document.getElementById('title').value;
                desc = document.getElementById('description').value;
                if (localStorage.getItem('itemsJson')==null){
                    itemJsonArray = [];
                    itemJsonArray.push([tit, desc]);
                    localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray))
                }
                else{
                    itemJsonArrayStr = localStorage.getItem('itemsJson')
                    itemJsonArray = JSON.parse(itemJsonArrayStr);
                    itemJsonArray.push([tit, desc]);
                    localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray))
                }
                update();
            }

            function update(){
                if (localStorage.getItem('itemsJson')==null){
                    itemJsonArray = []; 
                    localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray))
                } 
                else{
                    itemJsonArrayStr = localStorage.getItem('itemsJson')
                    itemJsonArray = JSON.parse(itemJsonArrayStr); 
                }
                // Populate the table
                let tableBody = document.getElementById("tableBody");
                let str = "";
                itemJsonArray.forEach((element, index) => {
                    str += `
                    <tr>
                    <th scope="row">${index + 1}</th>
                    <td>${element[0]}</td>
                    <td>${element[1]}</td> 
                    <td><button class="btn btn-sm btn-primary" onclick="deleted(${index})">Delete</button></td> 
                    </tr>`; 
                });
                tableBody.innerHTML = str;
            }
            add = document.getElementById("add");
            add.addEventListener("click", getAndUpdate);
            update();
            function deleted(itemIndex){
                console.log("Delete", itemIndex);
                itemJsonArrayStr = localStorage.getItem('itemsJson')
                itemJsonArray = JSON.parse(itemJsonArrayStr);
                // Delete itemIndex element from the array
                itemJsonArray.splice(itemIndex, 1);
                localStorage.setItem('itemsJson', JSON.stringify(itemJsonArray));
                update();

            }
            function clearStorage(){
                if (confirm("Do you areally want to clear?")){
                console.log('Clearing the storage')
                localStorage.clear();
                update()
                }
            }
        </script>
</body>