// Turn on Developer Mode under User Settings > Appearance > Developer Mode (at the bottom) // Then open the channel you wish to delete all of the messages (could be a DM) and click the three dots on the far right. // Click "Copy ID" and paste that instead of LAST_MESSAGE_ID. // Copy / paste the below script into the JavaScript console. // If you're in a DM you will receive a 403 error for every message the other user sent (you don't have permission to delete their messages). var before = 'LAST_MESSAGE_ID'; 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/${channel}/messages`; const headers = {"Authorization": authToken }; let clock = 0; let interval = 500; function delay(duration) { return new Promise((resolve, reject) => { setTimeout(() => resolve(), duration); }); } fetch(baseURL + '?before=' + before + '&limit=100', {headers}) .then(resp => resp.json()) .then(messages => { return Promise.all(messages.map((message) => { before = message.id; return delay(clock += interval).then(() => fetch(`${baseURL}/${message.id}`, {headers, method: 'DELETE'})); })); }).then(() => clearMessages()); } clearMessages();