Let’s face it: sometimes DateTime is just too much: you only want to deal with dates. Since .NET 6, we finally have support for DateOnly. In this blog I’ll look at how to interact with it and how to add it to your Swagger API docs.

You have a bunch of online services that let you take screenshots of a site and save them in a folder. While it can be very useful to pay for such a system, it is not so hard to create it. Let’s use Chrome / Chromium with Puppeteer and Node.js (cluster) to take some snapshots in no-time. We’ll use the Puppeteer Cluster package to run multiple threads / workers to grab those screens in parallel. We’ll be using TypeScript.

Have you tried turning it on and off again? The web is a weird place and calls might not always succeed in the right manner. A retry with an exponential back-off mechanism helps your code to be more resilient when it connects to services outside of your control. While there are many packages that can help in this area, it pretty easy to add some utility methods to your project. In this article I’ll show how you can create a general-purpose exponential back-off and retry mechanism using TypeScript and Node.js.

This week we had to exfil some data out of a bucket with 5M+ of keys. After doing some calculations and testing with a Bash script that used AWS cli, we decided to go a more performant route and use s3p. They claim to be 5-50 times faster than AWS cli 😊.

Let’s face it, using positional arguments like $1 and $2 for your arguments is not very descriptive and not very flexible. There is a better way to supply arguments: with this simple trick you’ll get named arguments in your-script, which is way better 🤓.

Yesterday we’ve encountered a curious problem: we needed use Spark to parse JSON data that was produced by AWS Kinesis. Unfortunately, the data was in a concatenated JSON format. Spark does not support that format, so we had to come up with something our selves.

I love the group by SQL command, and sometimes I really miss these SQL-like functions in languages like JavaScript. In this article I explore how to group arrays into maps and how we can transform those maps into structures that work for us. We will leverage TypeScript generics to do transformation on data structures in such a way that the end-result remains strongly typed: this will make your code more maintainable.

While working in Databricks, I needed to plot some images. I wrote some code that does this in IPython notebooks, but nothing that works on a Dataframe. I decided to change the code a bit, so it works in Databricks. This solution uses PIL and Matplotlib.

At Wehkamp we use decoration a lot. Decoration is a nice way of separating concerns from the actual code. Most of our repositories need the same set of decorators: exception logging, latency metrics and Jaeger spans. In this article I’ll be joining these 3 types of decorator into a single Swiss Army Knife decorator: one decorator to rule them all.

Adding observability to micro services is vital if you want to discover bottle necks. In this blog, I’ll show how we implemented Jaeger in .NET Core to observe incoming and outgoing requests. We’ll also use a Jaeger decorator to observe spans in classes.