title: Convert string array "[1,2,3]" to array of number in Javascript
body: <p>I have been searching for a solution but I only found the convertion from <code>["1","2","3"]</code> to <code>[1,2,3]</code>, but my question is how to convert this: <code>"[1,2,3]"</code> to <code>[1,2,3]</code>.</p>
  
  <p>It might be clear for many of you but for me not.</p>