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    An AWS Lambda Function to resize images automatically with API Gateway and S3 for imagemagick tasks. When an image is called on AWS Api Gateway, this package will resize it and send it to the S3.



    • Node.js - AWS Lambda supports versions of 10.20.1 or above (Recommended: 12.X).

    New version 2.0

    We've changed our approache to remove redirects from our responses. Then, we are returning a binary file base 64 image file.

    Steps to version 2.0

    You must have AWS CLI installed to execute a command from your console:

    aws apigateway update-integration-response --rest-api-id <API_ID> --resource-id <RESOURCE_ID> --http-method GET --status-code 200 --patch-operations '[{"op" : "replace", "path" : "/contentHandling", "value" : "CONVERT_TO_BINARY"}]'

    In API GW -> Settings -> Binary Media Types and add:


    What is it?

    It's AWS Lambda, which is a compute service that lets you run code without provisioning or managing servers.

    Read more about AWS Lambda.


    The combination of API Gateway and Lambda is very powerful. It allows you to build some complex functionalities without maintaining any virtual machines yourself. Lambda can be hooked up to many other (AWS) Services including S3. That's why I decided to build an AWS Lambda Function to resize images automatically with API Gateway and S3 for imagemagick tasks. When an image is called on AWS S3 bucket (via API Gateway), this package will resize it and send it to the S3 before redirecting you to the new path of the image (aws bucket url or CDN).



    First, add Serverless globally:

    npm install -g serverless

    Then, clone the repository into your local environment:

    git clone
    cd lambda-resize-image
    npm install

    Modify and set the .env.example to env.yml with your data. (You are supposed to have already configured your local variables).

    AWS credentials

    To run local development you also might need to configure you aws credentials, or you can set them to what I've shown below.

    Deploy to Amazon AWS

    You can also check if you have everything installed in the correct way:

    $ serverless

    To deploy from your environment to Amazon AWS, you must:

    $ serverless deploy --stage dev or $ serverless deploy --stage prod for production configurations.

    Then, serverless will package, validate and upload your stack to Amazon AWS. It will probably look like this:

    Serverless: Packaging service...
    Serverless: Uploading CloudFormation file to S3...
    Serverless: Uploading artifacts...
    Serverless: Uploading service .zip file to S3 (1.52 KB)...
    Serverless: Validating template...
    Serverless: Updating Stack...
    Serverless: Checking Stack update progress...
    Serverless: Stack update finished...
    Service Information
    service: resizeS3Image
    stage: development
    region: eu-west-1
    stack: resizeS3Image-development
    api keys:
      GET - https://<api_key_here>{key+}
      handler: resize-dev-image
    Serverless: Removing old service artifacts from S3...

    When upload to AWS Lambda, the project will bundle only needed files - no dev dependencies will be included.

    Usage (image restrictions resize)

    To restrict the dimensions, we put a const var in the handle.js:

      width: 1800,
      height: 1800

    You can also change the url endpoint https://<api_key_here>{key+} to another one more tiny and cachable (cloudfront), you can also configure in you Api Gateway (lambda service) a Custom Domain Name.

    Example URL usage


    or with you own Custom Domain Names:<KEY_S3_IMAGE_HERE>?width=<WIDTH>&height=<HEIGHT>

    Example usage of lambda resize image

    Environment variables

    • URL - AWS URL S3 bucket or your CDN url to the BUCKET. (not required in version 2.0)
    • BUCKET - AWS S3 bucket. (required)

    Environment variables for serverless


    Local development

    1. $ npm i -g serverless
    2. $ npm i
    3. $ brew install imagemagick
    4. $ serverless offline start

    Note that you will need to be into the root repository. The last command (4.) will spin up an serverless-offline version of an API Gateway, that will simulate the real one. Once it is running, you can see all the requests on your command line.

    Example request


    Configuration Parameters

    Parameter type description
    width Integer Required. Will resize image via imagemagic resize.
    height Integer Optional. Will resize image via imagemagic crop.


    We'd love to get feedback on how you're using lambda-resize-image and things we could add to make this tool better. Feel free to contact us at


    If you'd like to contribute to the project, feel free to submit a PR. See more:


    This project is licensed under the MIT License - see the file for details


    • Miguel Vieira - Initial work - apoca

    See also the list of contributors who participated in this project.


    npm i lambda-resize-image

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    • apoca