What faction in corporation

[Astra_Agnon]

Good afternoon. Can someone help me with a question:
I have a list of NPC sourcing on request:
https://esi.evetech.net/latest/corporations/npccorps/?datasource=tranquility,
I can find out the name of each corporation, etc. on request:
https://esi.evetech.net/latest/corporations/ corporationID/?datasource=tranquility,
How can I find out which FACTION it belongs to?

[Geo_Eclipse_Oksaras]

You can look up in game or on dotlan the faction and all the corps that fall under it

[Astra_Agnon]

interesting use ESI

[Joao_Neto]

This is missing from ESI, but is available in the SDE (https://developers.eveonline.com/resource).

For example, Caldari Navy (corporation 1000035) has a factionId value of 500001 (Caldari State):

{
  ...
  "factionID": 500001,
  "nameID": {
    "en": "Caldari Navy",
    ...
  },
  "raceID": 1,
  ...
}