JSFiddle - React, Tailwind, and code Playground

CSS

input {
    display: block;
    width : 500px;
}

JavaScript

var list = "[768.234.232, 768.234.232, 574,10-10-2012, 10-10-2012, 768.234.232, 768.234.232, 987, 10-10-2012, 10-10-2012]";

    list = list.slice(1, -1); // remove the enclosing []
    var allValues = list.split(/\s*,\s*/); // split on comma with optional whitespace
    var a = [];
    for (var i = 0; i < allValues.length; i += 5) {
        a.push(allValues.slice(i, i + 5 <= allValues.length ? i + 5 : allValues.length));
    }

    console.log(a);
    var tb;
    for (i = 0; i < a.length; i++) {
        tb = document.createElement('input');
        tb.value = a[i].join(", ");
        document.body.appendChild(tb);
    }