AWS Lambda function write to S3

Question

I have a Node 4.3 Lambda function in AWS. I want to be able to write a text file to S3 and have read many tutorials about how to integrate with S3. However, all of them are

Answer 1

Yes it is absolutely possible!

var AWS = require('aws-sdk');
function putObjectToS3(bucket, key, data){
    var s3 = new AWS.S3();
        var params = {
            Bucket : bucket,
            Key : key,
            Body : data
        }
        s3.putObject(params, function(err, data) {
          if (err) console.log(err, err.stack); // an error occurred
          else     console.log(data);           // successful response
        });
}

Make sure that you give your Lambda function the required write permissions to the target s3 bucket / key path by selecting or updating the IAM Role your lambda executes under.

IAM Statement to add:

{
    "Sid": "Stmt1468366974000",
    "Effect": "Allow",
    "Action": "s3:*",
    "Resource": [
        "arn:aws:s3:::my-bucket-name-goes-here/optional-path-before-allow/*"
    ]
}

Further reading:

• AWS JavaScript SDK
• The specific "Put Object" details