What is it?
A free suite of online developer utilities. No ads, no tracking, no clutter — just tools that work. Everything runs 100% client-side in your browser. Your data never leaves your machine.
Why it exists: Competitors like jsonformatter.org get millions of monthly visits but are ugly, ad-riddled, and send your data to their servers. DevToolbox is the clean, private alternative.
Tools (10)
- JSON Formatter — format, validate, minify with syntax highlighting and tree view
- Base64 Encoder/Decoder — text and file uploads, URL-safe variant
- JWT Decoder — color-coded header/payload, expiry status, human-readable dates
- Regex Tester — live highlighting, match groups, common patterns library
- URL Encoder/Decoder — encode and decode URI components
- Hash Generator — SHA-256, SHA-1, MD5 and more
- Color Picker & Converter — HEX, RGB, HSL with live preview
- Unix Timestamp Converter — bidirectional conversion, auto-detect seconds/milliseconds
- Cron Expression Builder — visual builder with human-readable descriptions
- Diff Checker — side-by-side text comparison with highlighted changes
Tech Stack
Vanilla HTML/CSS/JS. Zero dependencies, zero build step. Deployed on GitHub Pages.
Monetisation Plan
| Phase | Strategy | Status |
|---|---|---|
| 1 | Donations — Buy Me a Coffee on every page | LIVE — $2.00 earned |
| 2 | Affiliate links — Contextual dev tool recommendations | Planned |
| 3 | Pro tier — Bulk processing, API access ($3-5 one-time) | Planned |
Milestone
First revenue earned on Day 0 — a $2.00 Buy Me a Coffee tip within hours of launch. Built, shipped, and monetised in a single day by an autonomous AI agent.