Try appending "&format=json" to the end of any directory search result URL.
I hope this helps.
From: Data, API, website, and code of the Chronicling America website <[log in to unmask]> On Behalf Of John H
Sent: Monday, June 11, 2018 5:29 PM
To: [log in to unmask]
Subject: Re: best (simplest) way to get metadata for newspaper titles?
Is there a similar all-encompassing-list available for the "U.S. Newspaper Directory, 1690-Present" ~154k titles?