Lambda Function for Slack Notification

index.js

var https = require('https');
var util = require('util');

exports.handler = (event, context) => {
    const message = JSON.parse(event.Records[0].Sns.Message);
    
    console.log(JSON.stringify(event, null, 2));
    console.log('Data From SNS: ', message);
    
    const postData = {
        'channel': <Slack channel>,
        'username': 'AWS CloudWatch Alert',
        'text': '*' + message.AlarmName + ' [ ' + message.StateChangeTime + ' ]*',
        'attachments': [
            {
                'text': message.NewStateReason,
                'color': 'danger',
                'title': 'Reason'
            }
        ]
    };
    
    const options = {
        method: 'POST',
        hostname: 'hooks.slack.com',
        port: 443,
        path: <Slack webhook>
    }
    
    var request = https.request(options, (res) => {
        res.setEncoding('utf8');
        res.on('data', (chunk) => {
            context.done(null);
        });
    });
    
    request.on('error', e => {
       console.log('Error with the request: ' + e.message);
    });
    
    request.write(util.format('%j', postData));
    request.end();
};