I've been searching around trying to find a unified source of all the code for the homebrew creator and I haven't been abe to find one. Is there like an API I've been missing or searching the wrong term? 

I wish there was a page  could visit and have all the things you can add into a text box listed like:

Attack: [attack]{...}[/attack]
rollable: [rollable]{...}[/attack]
spell:[Tooltip Not Found]

or a standardization for how to write attack actions. I know when you create something based of another creature it automatically gets written in but when I'm trying to add an ability from somewhere else it gets confusing and eats up a lot of time searching for the creature or NPC that has the feature, opening up a new window and creating a homebrew based on that creature and then having to delete it.

Is there a consolidated list of that stuff anywhere anyone is aware of?

There are multiple lists, one for Tooltips ( stuff like dash and prestidigitation), one for rollables (on monster statblocks), and one for snippets (the things that calculate data on the character sheet). You can find links to all three in the General Homebrew FAQ #4: (https://www.dndbeyond.com/forums/dungeons-dragons-discussion/homebrew-house-rules/131411-a-homebrewers-how-to-faq). I hope that helps.

Quote from 4rt3m1sV >>

I've been searching around trying to find a unified source of all the code for the homebrew creator and I haven't been abe to find one. Is there like an API I've been missing or searching the wrong term? 

I wish there was a page  could visit and have all the things you can add into a text box listed like:

Attack: [attack]{...}[/attack]
rollable: [rollable]{...}[/attack]
spell:[Tooltip Not Found]

or a standardization for how to write attack actions. I know when you create something based of another creature it automatically gets written in but when I'm trying to add an ability from somewhere else it gets confusing and eats up a lot of time searching for the creature or NPC that has the feature, opening up a new window and creating a homebrew based on that creature and then having to delete it.

Is there a consolidated list of that stuff anywhere anyone is aware of?

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 Thank you a lot!