If you want to build a newsletter or any other aggregated article based feed, you need valuable online articles and blog pages without all the unessential parts like advertisements, banners, etc.
Besides you want it in a JSON format so that you can easily process it and display it in your own customized way. This API takes the URL as a parameter and scrapes the relevant info like title, text, images, author, media amongst other valuable info.
Disclaimer: This API may not work for articles behind a paywall or protected articles.