Get Facebook canonical Post ID (share URL) without pfbid parameter

fb_post_id_script.js

javascript: fbid = /share_fbid":"(\d+)"/g.exec([...document.getElementsByTagName("script")].filter(x => x.innerHTML.includes("share_fbid"))[0].innerHTML)[1]; alert(location.href.split("/").slice(0, -1).join("/") + "/" + fbid);

// can be used in console / bookmark / address bar (remember to add back javascript if the browser strips it automatically)

  (function getDebugInfo(flag) {
    const debugInfoObject = {};

    try {
      const debugMatch = document.body.outerHTML.match(/(debug_info":null,"id":")(\w+)/);
      if (!debugMatch) throw new Error("Debug info not found in the HTML.");

      const debugInfoEncoded = debugMatch[2].match(/\S{20,60}/)[0];
      const debugInfoDecoded = atob(debugInfoEncoded);
      const debugInformation = debugInfoDecoded.match(/(\d+)/g);

      if (!debugInformation) throw new Error("Invalid debug info format.");

      const profileAnchor = document.querySelector('.xjp7ctv a.x1i10hfl[role="link"][aria-label]');
      if (!profileAnchor) throw new Error("❌ profile anchor element not found");

      const profileName = profileAnchor.getAttribute('aria-label').replace(/, view story/,'');
      const profileURL = profileAnchor.href.replace(/https:\/\/www\.facebook\.com\//, '').replace(/\?.+/, '');

      const profileID = debugInformation[0] || null;
      const postID = debugInformation[1] || null;
      const postPFBID = (window.location.href.match(/posts\/(pfbid\S+)/) || [])[1] || null;

      debugInfoObject['Profile ID'] = profileID;
      debugInfoObject['Post ID'] = postID;
      debugInfoObject['Post PFBID'] = postPFBID;
      debugInfoObject['Profile Name'] = profileName;
      debugInfoObject['Profile URL'] = profileURL;

      if (flag === "ALL" || flag === 0) console.log("Debug Info Object:", debugInfoObject);
      if (flag === "PROFILEID" || flag === 1) console.log("Profile ID:", profileID);
      if (flag === "POSTID" || flag === 2) console.log("Post ID:", postID);
      if (flag === "POSTPFBID" || flag === 2) console.log("Post PFBID:", postPFBID);
      if (flag === "COMBINE" || flag === 3) console.log("Combined URL:", 'facebook.com/' + profileID + '/posts/' + postID);

      const regex = /(facebook\.com\/(\d+)\/posts\/(\d+)|facebook\.com\/([a-zA-Z]{1}\S+)\/posts\/(\d+)|\/pfbid[0-9a-zA-Z]+)/;
      const match = window.location.href.match(regex);
      if (match) {
        const filtered = match.filter((val, idx) => val !== undefined && idx > 0);
        debugInfoObject['URL Match'] = filtered;
      } else {
        debugInfoObject['URL Match'] = null;
      }

    } catch (error) {
      console.error("Error:", error.message);
    }

    console.log("DEBUG FLAG:", flag);
    return debugInfoObject;

  })('ALL');

Here's another way.