Active project
404cache
An independent digital workshop for useful browser tools, documented projects, and practical technical writing.
Open the project- Built with
- Next.js
- Contentlayer
- Cloudflare
Independent digital workshop
Useful tools and honest notes from building things on the web.
404cache is Adam Johnston’s workbench for browser-based tools, documented projects, practical technical guides, and the useful bits learned along the way.
Build things.
Learn things.
Document the useful bits.
01 / Use something
Featured tools
Small browser utilities for the jobs that should not need an account, an upload, or a complicated workflow.
- Image Compressor / ResizerCompress & resize images in your browser. Strip metadata, set quality & dimensions.01 · Images & assets
- QR Code GeneratorCustomizable QR codes. Works fully offline.02 · Images & assets
- Regex TesterLive highlight, capture groups & replace. Copy matches as JSON/CSV.03 · Text & data
02 / In progress
Currently building
The active work, shown with its decisions and rough edges rather than presented as a finished case study.
03 / Build notes
From the workbench
Technical decisions and lessons recorded while making and maintaining things.
Build note / 2025
Balancing Dynamic Content with SEO Using a Hybrid Architecture
How to combine static markup with JavaScript-driven modules so your site stays crawlable without giving up modular, dynamic experiences.
Build note / 2025
Automating Indie Blogs with GitHub Actions
Turn GitHub Actions into a dependable editorial assistant for builds, QA, backups, promotion, and analytics tailored to indie blog teams.
Build note / 2025
Cloudflare Pages vs GitHub Pages - Which Should You Use?
A balanced look at what each platform offers, plus a lesser-known difference in caching flexibility that can influence your decision.
04 / Keep for later
Practical guides
Focused explanations for problems you can solve, reuse, and adapt.
- 01
Mastering Regular Expressions: Build Your Own Regex Tester
Learn regex fundamentals and build a lightweight regex tester with JavaScript and HTML.
- 02
Robots.txt and XML Sitemaps: Complete SEO Setup Guide
Learn how robots.txt and XML sitemaps shape search engine crawling, with step-by-step instructions, automation tips, and tools to validate your setup.
- 03
Cron Expressions Guide: Automate Tasks Like a Pro
Learn to read and build cron expressions to schedule recurring tasks on Linux, Node.js and cloud platforms with practical examples.
05 / The things
More projects
Projects are the work itself. Notes and guides document what happened around them.
Shipped
AstroGenesis.wiki
An interactive habitability map that turns NASA space-bioscience research into explorable insight cards.
Shipped
FontSize Tweak
A portable utility for changing individual Windows interface font settings.
06 / About
A digital workshop, not a content factory.
404cache is the home of tools, technical writing, experiments, and project documentation by Adam Johnston. It exists to build useful things, document the process, and preserve what was learned.