Lambda delete file from S3 event, useful when you want to parse data from file and destroy evidence.

delete-s3-object.js

var aws = require('aws-sdk');
var s3 = new aws.S3();

exports.handler = (event, context, callback) => {
  var srcBucket = event.Records[0].s3.bucket.name;
  var srcKey    = event.Records[0].s3.object.key;
  
  // Process file, maybe some CSV parse or image resize, etc.
  
  // Delete file
  var params = {
  Bucket: srcBucket, 
  Delete: { 
    Objects: [ 
      {
        Key: srcKey
      }
    ],
  },
};

s3.deleteObjects(params, function(err, data) {
  if (err) throw error; 
  console.log(data);
});
};