520 Grid System - HTML/CSS Framework Useful for Creating Facebook Apps and Pages

Introducing the 520 Grid System for Facebook Tab Apps and the 760 Grid System for Canvas Apps.

Support Only Specific Browsers for Admin Panels to Reduce Development Costs

Why limiting an internal admin panel to just Chrome is a reasonable way to cut development costs.

Notes from reading the summary of 'Admin Panel Sneak Peek♡Night #1' on useful things

Useful libraries and KPI validation notes from the 'Admin Panel Sneak Peek Night #1' meetup summary.

AI Coding and Review Tools I Use and How I Use Them (2025-10-06)

With AI-powered development assistance now commonplace, numerous tools are available. This article introduces my specific approach to using AI coding and review tools as of October 6, 2025. From OpenAI Codex CLI, which plays a leading role in implementation, to Claude Code CLI, which understands the context of the entire project, and review agents on Pull Requests that ensure quality from multiple perspectives, I've compiled my current best practices.

Supercharge Development with AI! Refactoring Towards AI-Friendly Code

AI coding tools are now indispensable partners in development. The refactoring they frequently suggest actually holds hidden hints for supercharging your development. Why is writing code that AI prefers the key to future team development?

The AI Era Trap 'Workslop': How to Ensure Quality in AI Coding vs AI Code Review?

AI coding assistance tools are becoming indispensable in development environments. However, low-quality code and review comments generated by AI, so-called 'workslop,' are beginning to emerge as new productivity impediments. What do we need to maximize the benefits of AI while avoiding quality pitfalls?

[Android] FILL_PARENT is Deprecated, Use MATCH_PARENT Instead (Android 2.2 and Later)

FILL_PARENT is deprecated from Android 2.2; use MATCH_PARENT instead — it's just a rename refactor.

[Android] Calling getWindowManager inside a fragment

Inside a Fragment, get DisplayMetrics via getActivity().getWindowManager() instead of getWindowManager().

Initial setup for running Beego apps on Heroku

How to configure a beego app to bind Heroku's $PORT and avoid the R10 Boot timeout error.

[Beego] How to Configure XSRF filtering

Enabling XSRF filtering in Beego globally, and turning it off per controller when needed.

[JavaScript] java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result

Fixing bigdecimal.js's repeating-decimal divide error by passing scale and RoundingMode.

[JavaScript][BigDecimal] java.lang.RuntimeException: Unknown call signature for obj = new java.math.BigDecimal: object

bigdecimal.js throws `Unknown call signature` when given a non-numeric value, so validate arguments first.

Reading Notes: 'First UX Design Guide' by Akihiko Ogihara / はじめてのUXデザイン図鑑

A beginner's take on 'First UX Design Guide' — learning UX concepts through experience essences and concrete case studies.

"HTML5 & CSS3 Lesson Book" is perfect as an introductory book

A short recommendation of 'HTML5 & CSS3 Lesson Book' — a solid introductory book for new engineers and designers.

Solution for Google Apps Script 'Exception: 1 日にサービス premium gmail を実行した回数が多すぎます。' (Too many executions of premium gmail service per day)

Fixing the Google Apps Script premium gmail daily execution limit error by tuning run intervals.

Reading Notes: 『人月の神話』(The Mythical Man-Month) by Frederick P. Brooks, Jr.

Notes on Brooks's classic on software project management — Brooks's law, surgical teams, and milestones.

Google Data Studio Blended Data Not Recommended for Production Environment

Avoid Data Studio blended data in production — prep tables/views on the source and let Data Studio just display.

Books I Recommend for Engineers Learning About Logistics Systems and Inventory Management

Three recommended books for software engineers who want to learn logistics and inventory management.

Browser Extensions to Edit Cookies (Chrome, Firefox)

A quick memo of Chrome and Firefox extensions handy for editing cookies.

How to Build a Proxy Server with Squid3

Steps for building an HTTP proxy server on Ubuntu using Squid 3.x.

[Personal Development] Created a Chrome Extension to Get Tweet Embed Code

A personal Chrome extension that reopens a tweet URL through Twitter Publish to grab its embed code.

If You Don't Continuously Update Apps/Web Services, You'll Never Be Able to Develop Them Again

A reflection on how app and web-service dev environments rot when left unmaintained.

108 things to do first when contract development starts

A kickoff checklist for contract dev projects covering tooling, product owner, priorities, and release flow.

Daylight Saving Time Specifications ~ Summer Time, Daylight Saving Time (DST)

A developer-focused summary of DST terminology and the PST ⇄ PDT switching rules to be aware of.

Reference Information Summary for Explaining Dependency Injection (DI)

A small link collection I lean on when explaining DI and DI containers to teammates.

How to Manage Environment Variables with direnv

A walkthrough of managing per-directory environment variables with direnv, from install to direnv allow.

Build with docker-compose build --no-cache Without Using Cache

A quick note on docker-compose build --no-cache to rebuild without the build cache.

Recreate and Start Containers with docker-compose up --force-recreate

How docker-compose up --force-recreate recreates containers before start, plus a per-container tip.

Real Engineer Horror Stories ~ HTTP Status Code 0 and curl: (35) SSL connect error

Two engineer horror stories: HTTP Status Code 0 and curl: (35) SSL connect error.

esbuild does not support transpiling to ES5

A quick note that esbuild does not support transpiling down to ES5.

ESLint Installation and Initial Setup for Express (Node.js) Projects

Installing and configuring ESLint in an Express (Node.js) project, walked through as a PR.

When Mining Ether on Ethereum Private Network, eth.blockNumber Stays at 0 Because DAG Generation Isn't Complete

eth.blockNumber stayed at 0 on an Ethereum private net because DAG generation wasn't done yet.

[Facebook] Summary of Useful Articles for Smartphone App Development

A curated list of Facebook Developer resources for building smartphone apps, split into mobile web, iOS, and Android tracks.

[Git] About Commit Granularity and Good Commit Messages

Personal habits for keeping commits small and messages meaningful, with reference articles.

[Node.js] Run Lint Before git commit with husky + lint-staged

Setting up husky and lint-staged with 'npx mrm lint-staged' to run Lint automatically on git pre-commit.

i18n Multilingual support management methods ~ Comparing advantages and disadvantages of Language files and Template files

Trade-offs of language-file versus per-language-template approaches for i18n multilingual support.

Collection of Helpful Articles for Understanding and Implementing Idempotence in Design

A curated reading list on idempotence — concept, design patterns, REST/HTTP, and shell scripting.

Purchased iPhone SE 2nd Generation 64GB Amazon Renewed for Development Testing

A note on picking up an iPhone SE 2nd gen 64GB from Amazon Renewed for development testing.

Speaking at JP_Stripes Connect 2026 — The Reality of Building and Billing AI Products, in Yokohama

On August 1, 2026, I attended JP_Stripes Connect 2026 in person at Iwasaki Gakuen Information Technology College in Yokohama, and spoke at the track session 'The Reality of Building and Billing AI Products.' This post summarizes the topics I covered (building AI products in production, and designing token-based and usage-based billing on Stripe), along with the full list of URLs I referenced on stage.

JP_Stripes Fukuoka Vol.12 Presentation Report ~ Pioneering Stripe API Migration with Speculative Implementation × AI

I recently presented at JP_Stripes Fukuoka Vol.12 with the title 'Pioneering Stripe API Migration with Speculative Implementation × AI.' I shared a case study on how we visualized Stripe API migration risks using AI and efficiently promoted the project in a safe manner. This article shares the content of that presentation.

[Mac] How to Set Up Android App Development Environment Using Eclipse

A memo on setting up an Android app development environment on Mac using Eclipse and the Android SDK.

[Mac] Development Environment Setup Procedure Memo

A memo on setting up GCC, Homebrew, zsh, SSH, and gitconfig for a Mac development environment.

[Mac] How to Configure PHP + Apache2 on Mountain Lion

How to enable the default PHP + Apache2 on Mountain Lion, with reference links for setting up MySQL or PostgreSQL.

Steps to Build Ruby Development Environment with RVM on Mac OS X Lion

Setting up Ruby 1.8.7 / 1.9.2 / 1.9.3 on Mac OS X Lion with RVM, from apple-gcc42 to default version selection.

Writing Documentation in Markdown and Managing Under docs/

Keeping specs and other per-project docs as Markdown under docs/ in the same git repository as the code.

Issuing SSL Server Certificates for Local Environment with mkcert

Issuing SSL/TLS certificates for localhost with mkcert, from install to multi-domain certs.

How to Configure MongoDB Atlas for Development Environment

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

nanapi Study Session vol4 【nanapi x Hatena】Points that can be stolen from Hatena and nanapi's development flow

Notes from nanapi Study vol4 reports: Wercker, Teatro, CasperJS, and nanapi's deployment flow.

Policy to Set NODE_ENV Only to production, development, test

Why I restrict NODE_ENV to just production, development, and test in Node.js apps.

[Node.js] Checking File Existence

Using fs.stat to check for a view file and redirect via Express when it's missing.

[Node.js] Sample code to get href values with cheerio

You need to chain .find('a') before .attr('href') to read an anchor's href with cheerio.

Node.js sample code to convert to JSON array

A short Node.js snippet that converts a two-dimensional array into a JSON array.

Resolving Node.js Timezone Issues with Environment Variable TZ=utc ~ production: UTC vs development: JST

Aligning production UTC and development JST in Node.js by setting the TZ=utc environment variable.

Implementing 'Practical Lessons in Peer Code Review'

Takeaways from Practical Lessons in Peer Code Review, including budgeting about 25% of development time for review.

Secret Mode and Private Browsing Cannot Be Detected

Why JavaScript can no longer detect Chrome's Incognito or Safari's Private Browsing after the 2019 browser changes.

Rails 5.x + Webpacker + React.js Development Environment Setup

How I set up a Rails 5.x + Webpacker + React.js development environment, from rails new through hot reload and yarn start.

Compared reset.css and normalize.css and Decided to Recommend normalize.css

Comparing reset.css and normalize.css and choosing normalize.css for its keep-what-works philosophy.

[Ruby] Convenient gem 'faker' for creating sample data

A short memo of reference links for 'faker', a Ruby gem that makes test and sample data generation easy.

Meaning and Etymology of 'Scratch Development'

A memo on the meaning and etymology of the term 'scratch development'.

Personal Metrics for Story Points in Scrum Development

A personal Fibonacci story-point to time conversion table, anchored on the Pomodoro Technique.

Implementation Methods for Sharing Cookies Between Subdomains and localStorage Between Different Domains

Reference links for sharing cookies across subdomains and localStorage across different domains.

Should Shared Library Directory Be Named 'shared' or 'common'?

Should a shared-library directory be named `shared` or `common`? Linux, Rails, and Capistrano all pick `shared`.

[Linux] Sample Code to Retry Shell Commands Until Success

A `/bin/sh` snippet that retries a command with back-off until it succeeds.

Reference Information Link Collection for Shopify App and Theme Development

A link collection of Zenn articles I personally rely on for Shopify app and theme development.

Setting Up Shopify Development Environment

A quick walkthrough of setting up a Shopify development environment, from account creation to the password-protected preview page.

Search Like SQL with Spreadsheet + Google Apps Script (GAS) + QUERY Function

Sample GAS code that uses the QUERY function to search a Google Spreadsheet like SQL.

[Symfony1.4][Validator] How to Create Custom Validators

Building a Symfony 1.4 custom validator that checks ISBN-10 / ISBN-13 length and characters.

[Symfony1.4] How to Set Validation Errors on Individual Fields with PostValidator

Attaching per-field validation errors from a Symfony 1.4 PostValidator via sfValidatorErrorSchema.

[Symfony1.4] Template Modification: setTemplate

Using Symfony 1.4's setTemplate to switch the template an action renders.

Policy to Define URL String Maximum Length Validation at 2,000 Characters

Why I set URL string validation to a maximum of 2,000 characters based on RFC and vendor guidance.

Considering the Impact and Response Strategy for URL Refactoring

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

Continuing Product Development with a User-First Perspective

I believe that developing with a user-first perspective, rather than prioritizing only software engineers' convenience, is an important trade-off in software development.

USPS Tracking Numbers are Recycled and Not Unique Values

Why treating USPS tracking numbers as unique values is dangerous — they get recycled after delivery.

Website Speed Optimization

A short memo of reference articles on website speed optimization — CSS Sprites and prerendering.

Bulk Download Entire Website with wget Command [Linux]

A sample wget option set to bulk download an entire website as a static backup.