When your parser accepts trailing commas, it becomes much easier to edit your lists and objects.<p>In standard json, the last element in a list or object is special, in that it can&#x27;t have the trailing comma. Thus you have to special case every deletion and insertion of elements, to check if it needs a comma or not.<p>Without this requirement, you can remove and add elements without worry, which makes it easier for hand editing, and easier to avoid bugs in code.