listen-bucket.js

var Minio = require('minio')

// Instantiate the minio client with the endpoint 
// and access keys as shown below.
var minioClient = new Minio.Client({
    endPoint: 'play.minio.io',
    port: 9000,
    secure: true,
    accessKey: 'Q3AM3UQ867SPQQA43P2F',
    secretKey: 'zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG'
});

// Start listening for notifications on the bucket, using our arn.
var poller = minioClient.listenBucketNotification('atuljha', 'img-', '.jpg', ['s3:ObjectCreated:*'])
// Notification will be emitted every time a new notification is received.
// For object creation, here is a sample record:

// { eventVersion: '2.0',
//   eventSource: 'aws:s3',
//   awsRegion: 'us-east-1',
//   eventTime: '2016-08-23T18:26:07.214Z',
//   eventName: 's3:ObjectCreated:Put',
//   userIdentity: { principalId: 'minio' },
//   requestParameters: { sourceIPAddress: '...' },
//   responseElements: {},
//   s3:
//    { s3SchemaVersion: '1.0',
//      configurationId: 'Config',
//      bucket:
//       { name: 'bucket1',
//         ownerIdentity: [Object],
//         arn: 'arn:aws:s3:::bucket1' },
//      object: { key: 'photos%2Fobject.jpg', size: 10, sequencer: '...' } } }
poller.on('notification', record => {
    console.log('New object: %s/%s (size: %d)', record.s3.bucket.name,
                record.s3.object.key, record.s3.object.size)

    // Now that we've received our notification, we can cancel the listener.
    // We could leave it open if we wanted to continue to receive notifications.
    poller.stop()
})