Try the List Old Navy storefront categories API

- Omit `cid` to list Old Navy's top-level divisions (New & Trending!, Uniforms, Activewear, Women, Men, Girls, Boys, Toddler, Baby, Maternity, Today's Deals!), sourced from the storefront's own homepage top nav. - Pass a `cid` -- a division's own, or any deeper category's -- to list the related categories for that part of the storefront instead, in the same order the live storefront menu shows them. This is section-level, not necessarily unique per leaf: a narrow subcategory's `cid` (e.g. Boys T-Shirts) currently returns the same list as its parent division (Boys), since Old Navy serves this block once per section rather than once per category. Each returned entry's `cid` is usable directly as the `cid` query parameter to [`oldnavy-category`](oldnavy-category.md). - **Currently only available for `brand=on` (Old Navy).** Passing any other `brand` value (Gap, Banana Republic, Athleta) returns `400`. - A non-numeric `cid` returns `400` before any upstream request is made. - Old Navy does not return a distinct not-found signal for an unrecognized `cid` on this page (unlike `oldnavy-category`'s own commerce-API lookup, which does 404 cleanly) -- an unrecognized `cid` and a genuinely leaf-level category with no further children both look the same (`503`). If you need a hard not-found check for a specific `cid`, use `oldnavy-category` instead. Example response (`cid` omitted -- top-level divisions): ```json {"code":200,"msg":"OK","data":{"brand":"on","source_url":"https://oldnavy.gap.com/","fetched_at":"2026-08-10T00:00:00Z","categories":[{"name":"New & Trending!","cid":"3028309","url":"https://oldnavy.gap.com/browse/category.do?cid=3028309&mlink=5151,topNav,visnav&nav=meganav%3ANew%20%26%20Trending!%3A%3A"},{"name":"Women","cid":"1185233","url":"https://oldnavy.gap.com/browse/category.do?cid=1185233&mlink=5151,topNav,visnav&nav=meganav%3AWomen%3A%3A"},{"name":"Boys","cid":"1185232","url":"https://oldnavy.gap.com/browse/category.do?cid=1185232&mlink=5151,topNav,visnav&nav=meganav%3ABoys%3A%3A"}]}} ``` Example response (`cid=1185232`, Boys -- subcategories): ```json {"code":200,"msg":"OK","data":{"brand":"on","cid":"1185232","source_url":"https://oldnavy.gap.com/browse/category.do?cid=1185232","fetched_at":"2026-08-10T00:00:00Z","categories":[{"name":"T-Shirts","cid":"36097","url":"https://oldnavy.gap.com/browse/category.do?cid=36097&cl=true#department=16"},{"name":"Jeans","cid":"5936","url":"https://oldnavy.gap.com/browse/category.do?cid=5936&cl=true#department=16"},{"name":"Boys Shop by Size 5-20","cid":"39659","url":"https://oldnavy.gap.com/browse/category.do?cid=39659&cl=true#department=16"}]}} ```