firatkucuk · February 4, 2026 21:36 · kadiiskiFFW · Feb 26, 2021 · firatkucuk · Feb 26, 2021
diff --git a/delete-slack-messages.js b/delete-slack-messages.js
 #!/usr/bin/env node

 // Channel ID is on the the browser URL.: https://mycompany.slack.com/messages/MYCHANNELID/
 // Pass it as a parameter: node ./delete-slack-messages.js CHANNEL_ID

 // CONFIGURATION #######################################################################################################

 const token = 'SLACK TOKEN';
 // Legacy tokens are no more supported.
 // Please create an app or use an existing Slack App
 // Add following scopes in your app from "OAuth & Permissions"
 //  - channels:history
 //  - groups:history
 //  - im:history
 //  - mpim:history
 //  - chat:write

 // VALIDATION ##########################################################################################################

 if (token === 'SLACK TOKEN') {
    console.error('Token seems incorrect. Please open the file with an editor and modify the token variable.');
 }

 let channel = '';

 if (process.argv[0].indexOf('node') !== -1 && process.argv.length > 2) {
    channel = process.argv[2];
 } else if (process.argv.length > 1) {
    channel = process.argv[1];
 } else {
    console.log('Usage: node ./delete-slack-messages.js CHANNEL_ID');
    process.exit(1);
 }

 // GLOBALS #############################################################################################################

 const https         = require('https')
 const historyApiUrl = `/api/conversations.history?channel=${channel}&count=1000&cursor=`;
 const deleteApiUrl  = '/api/chat.delete';
 const repliesApiUrl = `/api/conversations.replies?channel=${channel}&ts=`
 let delay           = 300; // Delay between delete operations in milliseconds

 // ---------------------------------------------------------------------------------------------------------------------

 const sleep   = delay => new Promise(r => setTimeout(r, delay));
 const request = (path, data) => new Promise((resolve, reject) => {

    const options = {
        hostname: 'slack.com',
        port    : 443,
        path    : path,
        method  : data ? 'POST' : 'GET',
        headers : {
            'Authorization': `Bearer ${token}`,
            'Content-Type' : 'application/json; charset=utf-8',
            'Accept'       : 'application/json'
        }
    };

    const req = https.request(options, res => {
        let body = '';

        res.on('data', chunk => (body += chunk));
        res.on('end', () => resolve(JSON.parse(body)));
    });

    req.on('error', reject);
    
    if (data) {
        req.write(JSON.stringify(data));
    }

    req.end();
 });

 // ---------------------------------------------------------------------------------------------------------------------

 async function deleteMessages(threadTs, messages) {

    if (messages.length == 0) {
        return;
    }

    const message = messages.shift();

    if (message.thread_ts !== threadTs) {
        await fetchAndDeleteMessages(message.thread_ts, ''); // Fetching replies, it will delete main message as well.
    } else {
        const response = await request(deleteApiUrl, {channel: channel, ts: message.ts});

        if (response.ok === true) {
            console.log(message.ts + (threadTs ? ' reply' : '') + ' deleted!');
        } else if (response.ok === false) {
            console.log(message.ts + ' could not be deleted! (' + response.error + ')');

            if (response.error === 'ratelimited') {
                await sleep(1000);
                delay += 100; // If rate limited error caught then we need to increase delay.
                messages.unshift(message);
            }
        }
    }

    await sleep(delay);
    await deleteMessages(threadTs, messages);
 }

 // ---------------------------------------------------------------------------------------------------------------------

 async function fetchAndDeleteMessages(threadTs, cursor) {

    const response = await request((threadTs ? repliesApiUrl + threadTs + '&cursor=' : historyApiUrl) + cursor);

    if (!response.ok) {
        console.error(response.error);
        return;
    }

    if (!response.messages || response.messages.length === 0) {
        return;
    }

    await deleteMessages(threadTs, response.messages);

    if (response.has_more) {
        await fetchAndDeleteMessages(threadTs, response.response_metadata.next_cursor);
    }
 }

 // ---------------------------------------------------------------------------------------------------------------------

 fetchAndDeleteMessages(null, '');
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