#Steam ids - the three notations

One account, three spellings: a server log prints STEAM_1:0:11101, the status command prints [U:1:22202], the Web API uses 76561197960287930. Every call in this deck that takes a Steam id accepts all three. The conversions below are for producing one particular spelling.

#The 64-bit id

def p as steam.SteamId init steam.parseSteamId("76561197960287930");
io.printf("universe %d, type %s, account %d\n",
    $p.universe, steam.accountTypeName($p.accountType), $p.accountId);
# universe 1, type individual, account 22202

toSteamId64 reverses it, and refuses fields outside the values Steam issues (universe 1-5, type 0-10).

A personal id has 17 digits and a group id 18, but a game-server id has 17 as well, so length does not identify a person. isSteamId accepts any account type; isSteamId64 only a person:

steam.isSteamId("103582791429521412");     # true  - a group
steam.isSteamId64("103582791429521412");   # false - not a person

#Converting

steam.toSteamId2("76561197960287930");     # STEAM_1:0:11101
steam.toSteamId3("76561197960287930");     # [U:1:22202]
steam.fromSteamId2("STEAM_1:0:11101");     # 76561197960287930
steam.fromSteamId3("[U:1:22202]");         # 76561197960287930
steam.normalizeSteamId("[U:1:22202]");     # 76561197960287930

STEAM_X:Y:Z splits the account id into its low bit Y and the rest Z, so STEAM_1:0:11101 and STEAM_1:1:11101 are consecutive accounts. STEAM_0, which pre-2010 servers printed for the public universe, reads as universe 1. toSteamId2 throws for anything but a personal account: the notation cannot spell one.

[X:1:W] names the type by letter, so a group is [g:1:4]. The brackets are optional on input, and a fourth field sets the instance.

#User input

normalizeSteamId throws on anything that is not an id; looksLikeSteamId is the test that does not. A vanity name is not an id and needs a request: resolveAccount takes an id in any notation, a vanity name or a pasted https://steamcommunity.com/id/<name>/ and returns the id64, spending a request only on the vanity case (users).

#URLs

steam.profileUrl("STEAM_1:0:11101");
# https://steamcommunity.com/profiles/76561197960287930
steam.vanityProfileUrl("gabelogannewell");
# https://steamcommunity.com/id/gabelogannewell
steam.groupUrl("103582791429521412");
# https://steamcommunity.com/gid/103582791429521412

None of this makes a request; examples/steamid.j runs without a key or a connection.