Ask HN: APIs for getting books and author data

Hey ya'll,

I wanted to build a personal project for better tracking the books I read. I was wondering if:

1. There are any good apis for getting book data and author information (including demographic information). Paid is fine as well, if it's not too much I could consider that.

2. Anyones built something similar which collates this data from different places. Would be interested in hearing the how of that.

Cheers