Check out this tutorial how to use headless Chrome and Puppeteer to automatically scrape Craigslist.org and turn that data into a JSON API!
Puppeteer API Docs: https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md
Getting Started with Headless Chrome: https://developers.google.com/web/updates/2017/04/headless-chrome
Puppeteer Quick Start: https://developers.google.com/web/tools/puppeteer/get-startedMDN Selectors: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors