Chris Cook articles - 68 total
Lambdalet.AI: Reinventing the bookmarklet
I would like to present Lambdalet.AI, my submission for the AWS Lambda Hackathon. Lambdalet.AI...
Flatten Array of Arrays using JSONata for AWS Step Functions
The Map state of AWS Step Functions returns an array of arrays as a result. For further processing,...
TypeScript CLI: Automate Build and Deploy Scripts
I would like to follow up on my previous post about TypeScript CLIs. Here's how I want to proceed: I...
Unique Symbols: How to Use Symbols for Type Safety
If you’ve spent some time working with React, you might have stumbled upon React Query’s...
Buffer Logs and Flush Automatically on Error with Powertools for Lambda
The latest release of AWS Powertools for Lambda makes it easier to extend the Logger with custom...
How To Remove Dynamic Values From Snapshot With Serializers
Snapshot tests in Jest and Vitest are powerful tools for detecting unexpected changes in your code's...
Creating a TypeScript CLI for Your Monorepo
I like to create local CLIs for my Monorepo to automate tasks like build and deploy. These tasks...
Middleware for Step Functions: Automatically Store and Load Payloads from Amazon S3
I would like to introduce middy-store, a new library I built over the last couple of months. I've...
What's a Valuable Skill You Should Have?
There are certain skills that I always admire in other people. For example, when someone is fluent in...
Collect Logs and Metrics from non-AWS Server using CloudWatch Agent
Most AWS services provide logs or metrics to CloudWatch, which you can use to monitor your system's...
Optional vs. Undefined: How To Check for Optional Properties
In TypeScript, a property is considered optional if it can be omitted from an object, meaning it can...
Highlights: Extract Highlighted Text from Images using OCR and CV in your Browser
One of my first posts on DEV.to was about extracting highlighted text from images using OCR and...
The Fastest Way to Download from Amazon S3 (using Raycast)
If you are a heavy Amazon S3 user like me, you might have wondered if there is a quick way to...
Excluding Dependencies: Bundling for Node and the Browser
I stumbled upon this feature just yesterday, and it's one of those things that I'd like to never...
The Puppeteer Language Experiment
If you're using Puppeteer for automation, tests, or web scraping, you've likely encountered the...
A Simple Way to Sign AWS Requests with Signature V4
In a previous article, I explored the challenges of using Lambda Function URLs with IAM authorization...
Format and Parse Amazon S3 URL
Amazon S3 URLs come in different flavors. There are those starting with s3:, http:, or https:. Then,...
Solving the Puzzle: Lambda Function URLs with IAM Authorization and CloudFront Custom Domains
In this short article, I'd like to share some insights I gained from a recent issue involving the...
TypeScript: The Unexpected Magic of Generics
Over the weekend, I stumbled across an interesting TypeScript feature that I wasn't aware of. I...
Websites with AWS: Hosting with Private S3 Bucket
In my first post of this series, I delved into the classic approach to hosting a S3 website with...
Running on Lambda: Serverless Reader View with Chrome and Readability
Do you remember the Firefox Reader View? It's a feature that removes all unnecessary components like...
Websites with AWS: Single Page Applications
In my previous post, I explained how straightforward it is to host a static website on S3 with HTTPS...
Serverless Plugin: Exporting Environment Variables and Stack Outputs
I recently published my serverless-exports-plugin for the Serverless Framework. While it shares...
Websites with AWS: Hosting, HTTPS and Custom Domain
Hosting websites like static sites or single page applications on Amazon S3 is a charm. However, it...
Assertions: How to Assert Conditions and Types
The asserts statement was introduced in TypeScript 3.7. It's a special type of function signature...
How To Spy on Classes
Spying in Jest allows us to mock classes while keeping the original implementation intact. A spy can...
Extracting Class Methods: How To Derive an Interface From a Class
In object-oriented programming (OOP), we usually define an interface and implement that interface in...
Template Literal Types: How To Type Strings
Template literal types are essentially types for strings. By defining the pattern that a string must...
Stringify and Parse Errors in JavaScript
The Error object in JavaScript doesn't serialize to JSON with all its properties by default. That's...