[JavaScript] How to Extract Only URL from CSS background-image

Basic and class-scoped samples for pulling the URL out of a CSS background-image value with regex.

How to Measure Total Execution Time of MongoDB Queries

Measure total execution time of a multi-line MongoDB query block with a simple new Date() diff.

How to Prevent Sending JavaScript Errors from Specific Browsers with Sentry raven-js

Sample code that filters out errors from unsupported browsers (like pre-IE11) using Sentry raven-js's shouldSendCallback.

Free, Long-Duration, Multi-User Web Video Conferencing Tools

Comparing free web conferencing tools for long, multi-user calls — Google Hangouts, Skype, Zoom, and Whereby.

ReconnectingWebSocket - JavaScript Library for Handling WebSocket Auto-Reconnection Elegantly

Side-by-side sample code for WebSocket auto-reconnection using the raw API vs the ReconnectingWebSocket library.

Upgrading Windows 7 to Windows 10 (Lenovo G550, Backup, Memory Upgrade)

Upgrading a Lenovo G550 from Windows 7 to Windows 10 and bumping RAM to 8GB.

Engineering Manager in a Fully Remote Engineering Organization

Being an Engineering Manager in a fully remote org — tools, 1on1 prep, and attendance conventions.

AWS CLI Commands for Bulk Uploading Files to S3

`aws s3 cp` / `sync` commands for bulk-uploading files to S3, with --include / --exclude and --dryrun tips.

Recommended Articles for Understanding Cookies and Sessions

Recommended reading list for beginner web engineers to understand Cookies, Sessions, and IPA's session countermeasures series.

[Mongoose] How to Fix Error: Unable to invalidate a subdocument that has not been added to an array.

The 'unable to invalidate a subdocument' Mongoose error explained via a bad type: ObjectId value.

[Git] How to Fix error: cannot lock ref 'refs/remotes/origin/xxx': 'refs/remotes/origin/xxx/yyy' exists;

Resolving the git fetch cannot lock ref error by pruning stale remote refs with git remote prune origin.

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.