Simple code for AWS Lambda to process images resize using NodeJS and AWS S3 trigger.

• Have an AWS account.
• Have NodeJS 8 installed locally to generate the node_modules.

1. Create 2 buckets where one must have the sufix "resized", cause it will receive the resized images. I.e.

• my-image-bucket
• my-image-bucket-resized

2. Create a Lambda function and give the access role containing AmazonS3FullAccess.

It will allow Lambda to read and write to your buckets.

3. Add an S3 trigger to your Lambda.

• Point it to your bucket my-image-bucket.
• The Event type must be ObjectCreated.

Locally you need to generate the package that will be uploaded to aws. So in this project root folder:

1. Install the node_modules:

npm install

2. Generate a lambda.tar.gz file with containing the following files inside:

zip -r lambda node_modules index.js

3. Updalod the .zip file through your AWS Lambda panel and publish a new version.

4. Upload some image to your not resized bucket (i.e: images).

5. The image resized will appear inside the images-resized bucket in a folder resized-images.