Item metadata is linked to the item on-chain via a metadata URL. The metadata itself is stored off-chain. This means item metadata can be updated quickly and often, since it doesn’t require an on-chain transaction to do so.
// Construct the updates you'd like to make// Note: Metadata must be fully replaced with each updateconstitemUpdates= {"metadata": {"name":"itemName","description":"itemDescription","image":"http://url.com/image","attributes": [ {"type":"attribute1","value":20,"displayType":"number","maxValue":100 }, {"type":"attribute2","value":"value","displayType":"string" } ] }}// Update the itemconstresponse=awaitfetch('/v1/item-types/{itemTypeId}', { method:'PUT', headers: {"Content-Type":"application/json" }, body:JSON.stringify(itemUpdates),});constdata=awaitresponse.json();