If you store JSON in a version control system, then it is usually hand-edited JSON. (If it is generated programmatically at runtime, then the data is in a datab

If you store JSON in a version control system, then it is usually hand-edited JSON. (If it is generated programmatically at runtime, then the data is in a database.) And if a file is hand-edited, it's format should have niceties that make hand-editing more pleasant, like optional trailing commas, and comments. By making the format more suited to hand-editing, you also make it better for diffing and VCS.