In-game and during client-server communications most entity types are represented as an integer identifier e.g 17937 - Naïve bloodrager pouch

At the borders between these boundaries the integer is replaced by a human-readable string equivalent.

Removing magic numbers makes code immediately more readable.

if (npc.id == "bob" && option == "Trade") {
    player.openShop("bobs_brilliant_axes")
}

if (npc.id == 519 && option == 2) {
    player.openShop(1)
}

A string id should follow the following formatting rules to keep them standardised.

1. Lowercase
2. Underscores not spaces
3. Ascii equivalents of diacritics (accents)
4. "and" instead of "&"
5. All symbols removed

Naïve bloodrager pouch -> naive_bloodrager_pouch

Magic potion (3) -> magic_potion_3

In cases where there is no string id the integer id can be used as a string.

The majority of ids are generated from formatting their cache names.

If there is no known information to separate duplicate ids the second id onwards has a number suffix (i.e first one has no suffix, second one has 2, third 3, etc...)