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Convert A Node.js RESTful API To Serverless With OpenWhisk

When it comes to serverless solutions, there are many options available. If you’re a fan of the Microsoft cloud, you could create Azure Functions. If you’ve been keeping up, I wrote a tutorial called, Take a Node.js with Express API Serverless Using AWS Lambda, which used the Amazon Web Services cloud. Another solution is Apache OpenWhisk, a solution available on IBM’s Bluemix cloud.

We’re going to see how to convert the Node.js with Express application that I had written about in a previous article, and make it serverless with OpenWhisk.

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Take A Node.js With Express API Serverless Using AWS Lambda

Not too long ago I had written about creating an API with Node.js and Express that accepted image uploads and manipulated the images to be Android compliant before returning them in a ZIP archive. This article was titled, Create an Android Launcher Icon Generator RESTful API with Node.js, and Jimp, and it was a great example of creating APIs that that did most of their work in memory. I even demonstrated how to containerize the application with Docker.

Applications that manipulate media will need to be able to scale, otherwise there is a risk of the application crashing from not enough resources, or too many resources can get expensive. For this reason, it makes perfect sense to take the previous example serverless with Amazon’s Lambda and API Gateway offerings.

We’re going to see how to use API Gateway to accept HTTP requests with binary image data and process that data with Lambda to return various sized Android launcher images packaged in a ZIP archive.

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Containerizing A Node.js With Express Image Processing RESTful API Using Docker

Docker is a great way to package and deploy web applications. Applications that have been containerized can easily be created, destroyed, or even moved between servers, as long as the servers are using the Docker runtime.

Not too long ago I wrote about creating a RESTful API that could process images and generate Android compliant launcher icons. This article was titled, Create an Android Launcher Icon Generator RESTful API with Node.js, and Jimp and it was powered by Express Framework. The application could be served on any properly configured server with Node.js. The catch here is that server configuration is never easy or quick.

We’re going to see how to package our web application into a container using Docker.

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Create An Android Launcher Icon Generator RESTful API With Node.js, And Jimp

When you’re developing an Android mobile application, it is critical that you come up with a nice launcher icon for all possible Android screen densities. If you’re not too familiar with Android, there are mdpi, hdpi, xhdpi, xxhdpi, and xxxhdpi densities as of now. This number could change in the future.

Once you’ve got your icon, resampling or resizing it for each possible screen density can become a pain in the butt. Instead, it makes sense to use or create a script for this.

If you’ve been keeping up, you’ll remember I wrote about image generators in an article titled, Generating Splash Screens and Application Icons for NativeScript Mobile Apps. Since we’re talented developers, we’re going to create our own service this time around.

We’re going to see how to create a RESTful API that accepts an image and generates various sizes of that same image, bundled within a ZIP archive. We’re going to accomplish this task with Node.js and Express.

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