Delete all messages in a particular discord server

discord_message_remover.js

function deleteMessage() {
	const author = "YOUR_ID_HERE";
	const authToken = "TOKEN_HERE";
	const guild = "SERVER_ID";
	const channel = window.location.href.split('/').pop();
	const headers = { 'Authorization': authToken, 'Content-Type': 'application/json' };

	let clock = 0;
	let interval = 1000;
	function delay(duration) {
		return new Promise((resolve, reject) => {
			setTimeout(() => resolve(), duration);
		});
	}

	fetch(`https://discordapp.com/api/v6/guilds/${guild}/messages/search?author_id=${author}`, {headers})
		.then(response => response.json())
		.then(json => {
			Array.from(json.messages).map(message => {
				message.forEach(function(item) {
					if(item.hit === true) {
						delay(clock += interval).then(() => { fetch(`https://discordapp.com/api/v6/channels/${item.channel_id}/messages/${item.id}`, { headers, method: 'DELETE' }) });
					}
				});
			});

			if (json.total_results > 0) { delay(clock += interval).then(() => { deleteMessage(); }); }
		});
}

deleteMesssage()

Status on 3/19/2021: WORKING

Javascript used to delete all messages within a certain discord server by utilizing the existing search function.

Please do not change the interval too low, as it might trigger a Discord ban, more information please visit: https://discordapp.com/developers/docs/topics/rate-limits

How to:

1. go to https://discordapp.com/
2. login to your account
3. go to the server you wish to delete all your messages in
4. press ctrl+shift+i (chrome) to open up the developer console
5. go to the Network section within the developer console,
6. go to the search bar and search "from: your-username" (while the developer console is open)
7. under Name (within the network section) look for "search?author_id=xxx", click that
8. look at Request Headers
9. look for :path: ":path: /api/v6/guilds/x/messages/search?author_id=xx ", x is the SERVER_ID, xx is your YOUR_ID_HERE
10. look for authorization, replace it with TOKEN HERE
11. now copy and paste the whole code to the Console section within the developer tool and hit enter.

the script will now start to delete all your messages, it might take a while for the process.