Javascript code to extract Readinglist data to a csv file.

postdata_to_csv.js

// Prepare output
var csv="datetime,readtime";

// Get timestamps for all saved posts
var posts=document.querySelectorAll('time[datetime]');

// Add line with post data to csv
posts.forEach(function(i,j) { 
  // Remove comma from Locale format so its compitable with Google Sheets format
  var postTime = new Date(i.attributes.datetime.value).toLocaleString().replace(',','');
  
  // Get the readingTime through time parent node
  var readingTime=i.parentNode.querySelector('.readingTime').title.replace(' min read','');
  
  // Add line
  csv += "\n"+postTime+","+readingTime;
});

// Function to download data to a file
// Source: https://stackoverflow.com/a/30832210
function download(data, filename, type) {
    var file = new Blob([data], {type: type});
    if (window.navigator.msSaveOrOpenBlob) // IE10+
        window.navigator.msSaveOrOpenBlob(file, filename);
    else { // Others
        var a = document.createElement("a"),
                url = URL.createObjectURL(file);
        a.href = url;
        a.download = filename;
        document.body.appendChild(a);
        a.click();
        setTimeout(function() {
            document.body.removeChild(a);
            window.URL.revokeObjectURL(url);  
        }, 0); 
    }
}

// Download the data.csv file to default location
download(csv,"data.csv","text/csv")

remove_stories.js

// need a function to pause processing to prevent hitting rate litmits or overloading Medium
function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

//counter for loading next batch of posts
var counter=0, batchSize=10;

// and the async function which will process each story & remove it
async function removePost() {
  console.log('Count '+counter);
  // Check if its time to load next few posts
  if ( counter > batchSize ) {
    //first scroll to the bottom so next batch can be loaded
    window.scrollTo(0,document.body.scrollHeight);

    //reset counter
    counter=0;
  }
  
  // Only run if there are some posts still to remove
  if (  document.querySelectorAll('button[data-action="remove-from-queue"]').length > 0 ) { 
    
    //log were removing next story
    console.log('Removing next saved story...');
    
    // Get one stories Remove button and click it
    document.querySelector('button[data-action="remove-from-queue"]').click();
    
    //increment counter
    counter++;
    
    // wait then call removePost again
    sleep(2000).then(() => { 
      removePost() 
    });
    
  } else {
    console.log("No more stories left!");
  }
}

// Start removing posts
removePost();