MEMO: Pure JS super simple basic type validation functions.

simple-basic-type-validation-funcs.js

function isNumeric(s) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

function isURL(s) {
  return (/^https?\:\/\/(.+)/.test(s));
}

function isJSON(s) {
  let o;
  try {
    o = JSON.parse(s);
    return true;
  } catch (e) {
    return false;
  }
  return false;
}