Redis Replication (Master-Slave) Environment Setup [docker-compose Edition]

Setting up and verifying a Redis master-slave replication environment with docker-compose.

Determining Country, City, Postal Code, and ASN from IP Address [GeoIP2 + Node.js]

Node.js samples for looking up country, city, postal code, and ASN from an IP with GeoIP2.

[Linux] Command to Delete Old Files by Specifying Date and Time

Use find with -mtime / -atime and xargs rm to bulk delete old files on Linux when freeing up disk space.

[Linux] Command to Check Directories with High Disk Usage

Combine du and sort to find the top directories eating disk space on Linux when hit with a disk full warning.

How to Deploy an Existing Express.js Project to Heroku

Adding a Procfile to an existing Express.js app and deploying it to Heroku.

[JavaScript] Use unicode-substring for Extracting Parts of Strings Containing Unicode

Why substring breaks surrogate pairs — and how the unicode-substring package slices Unicode strings safely.

[JavaScript] Detecting Hyphens and Dashes with Regular Expressions Using unicode-regex + Dash_Punctuation

Detect the many kinds of hyphen and dash characters at once by combining unicode-regex with the Dash_Punctuation category.

[Express.js] Timeout Configuration Changes and Sample Code for Testing

Express.js default timeout, plus sample code for server / request / response setTimeout behavior.

JavaScript Function Currying Sample Code

Currying samples that let you call add(2)(3)(4).result(), written in both ES5 and ES6 styles.

[Linux/macOS] Batch Compress Files to .gz with gzip Command

Use gzip * to batch compress log files and free up disk space when hit with a sudden disk full incident.

Achieve Comfortable Video Calls with Noise Cancelling App Krisp

Using the Krisp noise-cancelling app to keep remote video calls clear from background noise.

[WordPress] Fixed Email Sending Issue with WP Mail SMTP Version 1.7.0

How I fixed WP Mail SMTP 1.7.0 by swapping the From Email and From Name fields back to their correct values.

Differences Between JavaScript Functions and Methods

The difference between JavaScript functions and methods, framed around MDN, CodeZine, and how this is bound.

HTTrack - Tool for Saving Entire Websites - macOS Edition

How to install HTTrack on macOS via Homebrew and mirror a whole website for offline browsing.

[JavaScript] Median Calculation Sample Code and Math.js Usage Examples

Compute the median in JavaScript with Math.js's math.median, or hand-written ES5 / ES6 functions.

Digital Content (PDF, Images, ZIP) Redistribution Prevention Strategies

Notes on preventing redistribution of PDF, image, and zip content sold on an EC site.

How to Update Node.js + NPM + Express All to Latest Versions

Bumping Node.js to the latest LTS and refreshing an Express project's npm deps in one shot with npm-check-updates.

How to Renew and Repurchase AWS EC2 Reserved Instances

Notes on renewing and repurchasing EC2 Reserved Instances after they expire, since they aren't auto-renewed.

Update nvm version | nvm バージョンアップデート

Running the official nvm manual upgrade shell script to update nvm itself.

Bookmarklet and JavaScript Sample Code to Bulk Show GitHub Hidden Comments

A bookmarklet and JS snippet to bulk-expand all Hidden Comments on a GitHub issue for browser search.

[Express.js] How to Fix (node:10151) UnhandledPromiseRejectionWarning: TypeError: res.status is not a function

If Express.js throws `res.status is not a function`, check the order of `req`, `res` in your handler.

[Newgistics] Time Zone is America/Denver - MT(MST/MDT)

How I identified the Newgistics API timezone as America/Denver (MT) from the newgistics-ruby client.

[JavaScript] Sample Code for Timezone String Validation with moment.tz.zone

Validate timezone strings in JavaScript with Moment Timezone's moment.tz.zone in just a few lines.

How to Prevent Chrome Browser from Caching 301 Redirects

Avoiding Chrome's 301 redirect cache trap in short-URL services by using 302 or 307 instead.

How to Display Ads in the Top Header Area with Google AdSense

Displaying ads in the top header area of a page with Google AdSense auto ads.

[JavaScript] How to Fix the Problem Where removeEventListener Cannot Remove Events

Why removeEventListener silently fails when the listener is redefined, and how to fix it by lifting the listener out.

Easy Table of Contents - WordPress Plugin for Displaying Table of Contents

Setting up Easy Table of Contents to auto-generate a WordPress post TOC.

[Shippo] Address Validation API Returns Valid Zip Code Even When Invalid Zip Code is Passed

Shippo's Address Validation API returns VALID even for an invalid zip — verified via cURL.

It's better to spend money on routers rather than internet connections

A colleague's advice on spending money on routers rather than internet connections, with recommended and avoided models.

Resolve Japanese character corruption in MySQL CLI with SET character_set_results=utf8mb4;

Fixing Japanese mojibake in the MySQL CLI with SET character_set_results=utf8mb4;.

How to send emails from Zendesk using G Suite group custom domain email addresses

Send Zendesk email from a G Suite group address on your custom domain, with Route 53 and SPF setup.

Modern Mobile-responsive JavaScript slider library Swiper

How I modified Swiper's sample code to load from CDN so the demos run as a standalone file.

Explanation of mongoose.Schema type: ObjectId

What type: ObjectId in a mongoose.Schema means, including MongoDB _id and Mongoose ref.

[WordPress] How to resolve Facebook Sharing Debugger 'The following properties are required: fb:app_id' error

Fixing Facebook Sharing Debugger's fb:app_id error with Yoast SEO.

How to completely uninstall Android apps for clean reinstallation

Steps to cleanly uninstall and reinstall an Android app, including turning off Google Drive backup.

How to transfer files to Android 9 devices using Android File Transfer

Switching the Android 9 USB mode to File Transfer and sending files from macOS with Android File Transfer.

'Product Managers Talk About Their Careers. For Engineers Under 35 Aspiring to be PdM【kiitokMeetup】' Participation Report #kiitok_meetup

Notes and takeaways from the kiitokMeetup event on product manager careers for aspiring PdMs.

'DMM meetup #12 Technologies Supporting DMM's New Business' Participation Report #dmm_meetup

Notes from DMM meetup #12 covering DMM's tech vision, Bitrise, Redash, and a containerization case study.

Amazon S3 'A conflicting conditional operation is currently in progress against this resource. Please try again.' error

Waiting out the S3 `conflicting conditional operation in progress` error when recreating a bucket with the same name.

How to publish a static website with custom domain using Amazon CloudFront + S3 + Route 53

Publishing a static site on a custom domain with CloudFront + S3 + Route 53, including OAI and HTTPS setup.

Hosting a static website on Amazon S3

Hosting a static site on Amazon S3, both S3-only and in combination with CloudFront.

Operational policy for distributing YouTube channel revenue among multiple people

An operational policy for splitting YouTube channel revenue among multiple owners, and where to check the earnings.

Renaming virtualenvwrapper environment names

Renaming a virtualenvwrapper environment by combining cpvirtualenv and rmvirtualenv.

Managing Multiple Versions of Ansible with virtualenv

How to install multiple Ansible versions side by side using virtualenv and virtualenvwrapper on macOS.

Considering the Impact and Response Strategy for URL Refactoring

Impact areas and response strategies to consider when refactoring URLs, including 301 redirects.

How to Configure MongoDB Atlas for Development Environment

Setting up MongoDB Atlas for development: free-tier region choice and Network Access whitelist notes.

Run docker system prune --volumes When Getting 'no space left on device' Error with Amazon ECS + Docker

Fixing the no space left on device error on Amazon ECS with docker system prune --volumes.

How to Bulk Delete Unused Docker Images, Containers, Volumes, Networks, and Cache

How to reclaim disk space with docker system prune and per-resource prune subcommands.

How to Deploy EC-CUBE4 to Heroku

Deploying EC-CUBE4 to Heroku with a workaround for the missing app.json error.

[GitHub] How to Filter Pull Requests by Creator and Reviewer

Filter GitHub Pull requests by author and reviewer with is:pr author: and is:pr reviewed-by: search qualifiers.