Batch delete for your own messages on a discord server. Use with caution. Work in progress.

delete-my-discord-messages.js

var before = 'LAST_MESSAGE_ID';
var authorId = 'AUTHOR_ID';
const authToken = 'AUTH_TOKEN';

let clearMessages = () => {
    const channel = window.location.href.split('/').pop();
    const baseUrl = `https://discordapp.com/api/channels/${channel}/messages`;
    const headers = {
        "Authorization": authToken
    };

    let clock = 0;
    let interval = 500;

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

    let lastBefore;

    fetch(`${baseUrl}?before=${before}&limit=100`, {headers})
        .then(resp => resp.json())
        .then(messages => {
            let filtered = messages.filter((message) => {
                return message.author.id === authorId;
            });
            lastBefore = before;
            before = messages.sort((a,b)=> (new Date(b.timestamp)).getTime() - (new Date(a.timestamp)).getTime()).unshift().id;
            return Promise.all(filtered.map((message) => {
                return delay(clock += interval).then(() => fetch(`${baseUrl}/${message.id}`, {
                    method: 'DELETE',
                    headers,
                    body: JSON.stringify(messages)
                }));
            }));
        }).then(() => {
            if(lastBefore !== before) {
                setTimeout(clearMessages, 500);
            }
        });
}

clearMessages();