Posts tagged "nodejs"

With Server-sent events you are able to send one-directional events to a web page.

Here is an example of how I used this functionality in Minimal Analytics

While building Minimal Analytics I had the need to test a function that was dependent on time.

In my case, the function returned the milliseconds until midnight.

Here is a simple way to test the function msUntilMidnight.

Web Analytics & dashboards always fascinated me.

This is my approach to a self-hosted, simple web analytics solution.

It also helped me to get back to Full stack web development, using a clean and testable approach.

Node.js 15 has been released, with exciting changes and improvements!

This is a short summary of my experience while writing a simple HackerNews scraper.

As a pure exercise or kata if you want, I tried to apply Clean code, Refactoring and Testing priciples for this small npm module.

The task is simple:

Get the posts on the front page of https://news.ycombinator.com and parse them.

This happened to me recently, and I couldn't understand the cause.

"Suddenly", after updating some npm packages, my npm install was "not working".

It exited abrubtly with status code 137, with the error message "Killed".

This is a short summary of what I learned while playing around with my Bangle.js Watch.

I managed to

• add an application to the Bangle.js (with create-bangle-app)
• send accelerometer data over Bluetoot Low Energy
• discover & connect to BLE devices with Node.js
• read accelerometer data with Node.js (coming from the watch)

Recently I got myself a treat: a Bangle.js Watch! ⌚️

It's a pretty awesome, open-source watch based on Espruino and Node.js, and much more! 🤓

Read about my experiments here especially for creating a mouse-watch app with Node.js and Bluetooth Low Energy!

How to configure authenticated uplinks with Verdaccio.

You're seeing a blank page saying "HTTP_ERROR 431"?

And you're running a Node.js HTTP server, like express or fastify?

In case the npm registry goes down, it's wise to have a backup registry.

A long awaited feature of the language and runtime has been released and is available in Node.js 14 (and modern browsers): Optional chaining!

The Nullish coalescing operator in useful to handle default values, without short-circuiting on values that result as falsy.

Falsy values are undefined, null, false, 0, NaN, and '' in JavaScript, and sometimes you want to retain those values, explicitly excluding null and undefined.

devblog is yet another lightweight static site generator.

Although there are widely used SSG like 11ty (which this blog was previously based on), Jekyll (also previously used), GatsbyJS and many others, I wanted to get my hands dirty and understand how to make the process of building a static blog even simpler, if possible.

Even simpler in the sense of "it does just what I need and nothing more".

Install via npm i -g devblog or create a blog with a one-liner npx devblog init my-new-blog, cd my-new-blog and serve with npx http-server _site 8080. It's that easy.

Rebuild the blog by running npx devblog (or npm i -g devblog and then just run devblog in the main directory)

Continue reading my story of building devblog.

Example repository and explanation to a practical crawling with browserless and puppeteer.

Browser automation built for enterprises, loved by developers.

browserless.io is a neat service for hosted puppeteer scraping, but there is also the official Docker image for running it locally.

I was amazed when I found out about it 🤯!

Find the whole source code on Github christian-fei/browserless-example!

GitHub example repo

At christian-fei/twitter-oauth-login-in-nodejs on GitHub you can find the whole source code.

Learn how to create a Twitter OAuth Application

Lately I found myself dealing with Twitter and Google OAuth (1.0a and 2.0) to authorize a user to act on their behalf, namely reading profile information, reading and posting content on their behalf or other common permissions.

Since my process of trying to understand and make sense of OAuth has been both fun and rough, I wanted to summarize a full example in a single JavaScript file and document other findings along the way.

Curious about how to call an HTTP API like Twitter or GitHub by authenticating through OAuth (1.0a and 2.0)?

Read more about how to do it with Node.js

Learn how to create Twitter login with OAuth 1.0a.

Personally I use dotenv to handle different environments in my Node.js applications.

It gives you the ability to specify a .env file (generally provisioned on each environment with the corresponding environment variables), along these lines:

An example of connecting to mongodb with the Monk NPM module.

Lately, I was having issues with lerna while trying to publish packages from a mono-repo.

The problem was that lerna, sometimes, failed while publishing the changed packages (with the command lerna publish --conventional-commits)!

I want to share how I maintain my connect / express middlewares for simple HTTP APIs in Node.js

The code snippets below are taken from pomodoro.cc api source code.

I finally managed to get the deployment of an eleventy - 11ty site (namely this one) and sync with AWS S3, where this blog is hosted.

If you stumbled upon this article, you are probably seeing the following error message on travis in the deployment stage:

I found it. It found me...

Whatever!

I came across the only documentation about cloning a git repo with the [--depth option](https://git-scm.com/docs/git-clone#git-clone

Rate limiting API calls to an HTTP service doesn't have to cumbersome and too complicated.

A simple way to achieve this (and that I use all the time) is to combine Promise.all with an npm package called p-limit.

p-limit is used to run multiple promise-returning & async functions with limited concurrency.

Today I sat down and wrote a tiny package called wait-for-user-input. it can be used to wait for stdin input in a command line script.

Let's say you want to filter odd numbers from a list of numbers, like [1,2,3,4,5,6] should become [1,3,5].

One way to solve this problem in a functional fashion is to provide an odd filter function, that is internally composed by a negation of an even filter on those numbers.