API IsSpellKnown
 

From https://wowwiki-archive.fandom.com/w...I_IsSpellKnown


Arguments
spellID: integer - the spell ID number
isPetSpell: boolean (optional) - if true, will check if the currently active pet knows the spell; if false or omitted, will check if the player knows the spell

Returns
isKnown: boolean - whether the player (or pet) knows the given spell

For the spells I know, starting from their name I can get their ID via But I can't get the ID of a spell I don't know, so is there an alternative way to find out if I know a spell?

That site may be out of date ..

https://warcraft.wiki.gg/wiki/World_...aft_API#Spells

If you know a spell it will be accessible via the spellbook.
Or you can use wowhead to identify spellIDs to use the IsSpellKnown functions.

You can always /dump GetSpellInfo() and refer to the link for which return is the SpellID.