A tiny JavaScript app that sends a message to your default Slack channel. Can be customized with a name, icon, emoji or sent to a different channel. Runs in Node.js.

sendToSlack.js

import fetch from 'isomorphic-fetch'

var urlWebHook = "https://hooks.slack.com/services/abcdef"; //the URL you get on your "incoming web hooks" page.

function sendToSlack(s, theUsername, theIconUrl, theIconEmoji, theChannel) {
    var payload = {
        text: s
    };
    if (theUsername !== undefined) {
        payload.username = theUsername;
    }
    if (theIconUrl !== undefined) {
        payload.icon_url = theIconUrl;
    }
    if (theIconEmoji !== undefined) {
        payload.icon_emoji = theIconEmoji;
    }
    if (theChannel !== undefined) {
        payload.channel = theChannel;
    }

    fetch(urlWebHook, {
        method: 'post',
        mode: 'no-cors',
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json',
        },
        body: JSON.stringify(payload),
    })
}


sendToSlack("Hello World");