11ty-rss-data-source.js

/* Place in your _data directory to create an Eleventy data source from an RSS feed
 * View package docs for full available parsed schema: https://www.npmjs.com/package/rss-parser
 *
 * TO USE in Nunjucks assuming a filename of `rssposts`
 *
 * {% for post in rssposts %}
 *    <article>
 *      <h3>
 *        <a href="{{ post.url }}">{{ post.title }}</a>
 *      </h3>
 *      <p>
 *        {{ post.description }}
 *      </p>
 *    </article>
 * {% endfor %} 
 */
 
const Parser = require("rss-parser");
const parser = new Parser();

module.exports = async () => {
  const feed = await parser.parseURL("[FEED_URL]");
  const content = feed.items[0].contentSnippet;

  return [
    {
      title: feed.items[0].title,
      url: feed.items[0].link,
      description:
        content.replace(/(<([^>]+)>)/gi, "").substr(0, content.lastIndexOf(" ", 160)) + "...",
    },
  ];
};