mass delete discord messages for a channel

massDeleteDiscord.js

// based on https://stackoverflow.com/a/49462738/1469797

// What It Do?
//
// Will delete all messages in a channel AFTER the message id specified
//
// Specify username/descriminator to only delete by user,
// or leave empty to delete all messages

// How To Use
//
// * In a web browser navigate to the channel you want to delete messages in
// * Find the message you want to start deleting from -> click three dots -> Copy ID
// * Copy all the below code into a text editor and replace values in the OPTIONS area with what you want
//   (message ID is the ID you copied from above)
// * Open devtools -> console
// * Copy and paste in all the code to the console and hit enter. Will show a message in console when done (it may take awhile!)

//
// COPY EVERYTHING BELOW THIS
//

// OPTIONS
var after = 'MESSAGE_ID'; // message ID to start deleting from
// If you want to delete ALL messages after MESSAGE_ID leave the below as-is
// otherwise replace values as shown
var your_username = ''; //your username
var your_discriminator = ''; //that 4 digit code e.g. username#1234
var interval = 1; // number of seconds to wait between deletions. Increase if you are experincing HTTP 429 responses from deletions. 

// don't change this
var foundMessages = false;
clearMessages = function(){
    const authToken = document.body.appendChild(document.createElement('iframe')).contentWindow.localStorage.token.replace(/"/g, "");
    const channel = window.location.href.split('/').pop();
    const baseURL = `https://discordapp.com/api/channels/${channel}/messages`;
    const headers = {"Authorization": authToken };

    let clock = 0;
    const noFilter = your_username === '' || your_discriminator === '';

    function delay(duration) {
          return new Promise((resolve, reject) => {
              setTimeout(() => resolve(), duration);
          });
    }

    fetch(baseURL + '?after=' + after + '&limit=100', {headers})
    .then(resp => resp.json())
    .then(messages => {
        return Promise.all(messages.map((message) => {
            before = message.id;
            foundMessages = true;
          

           if (noFilter ||
               (message.author.username == your_username
               && message.author.discriminator == your_discriminator)
           ) {
                return delay(clock += (interval * 1000)).then(() => fetch(`${baseURL}/${message.id}`, {headers, method: 'DELETE'}));
            }
        }));
    }).then(() => {

        if (foundMessages) {
            foundMessages = false;
            clearMessages();
        } else {
            console.log('DONE CHECKING CHANNEL!!!')
        }

    });
}
clearMessages();