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

You can upload file on s3 using

aws-sdk

If you are using IAM user then you have to provide access key and secret key and make sure you have provided necessary permission to IAM user.

var AWS = require('aws-sdk');
AWS.config.update({accessKeyId: "ACCESS_KEY",secretAccessKey: 'SECRET_KEY'});
var s3bucket = new AWS.S3({params: {Bucket: 'BUCKET_NAME'}});
function uploadFileOnS3(fileName, fileData){
    var params = {
      Key: fileName,
      Body: fileData,
    };
    s3bucket.upload(params, function (err, res) {               
        if(err)
            console.log("Error in uploading file on s3 due to "+ err)
        else    
            console.log("File successfully uploaded.")
    });
}

Here I temporarily hard-coded AWS access and secret key for testing purposes. For best practices refer to the documentation.