I Built a UUID Generator and Cron Expression Builder — Both Run 100% in Your Browser
Source: Dev.to
Introduction
I just shipped two more developer tools on EveryTool—both were tools I kept Googling repeatedly before finally building them properly.
UUID Generator
The EveryTool UUID Generator lets you create UUIDs entirely in the browser:
- Generates v1 (time‑based) and v4 (random) UUIDs.
- Supports bulk generation (e.g., 50 at once).
- One‑click copy to clipboard.
- Runs client‑side using the native
crypto.randomUUID()API—nothing leaves your browser. - No tracking, no ads, and no “sign up to generate more.”
Cron Expression Builder
The EveryTool Cron Expression Builder simplifies creating and validating cron syntax:
- Visual field‑by‑field builder (minute, hour, day, month, weekday).
- Human‑readable preview that shows exactly what the expression means in plain English.
- Real‑time validation to catch errors before they reach production.
- Common presets (every hour, every day at midnight, every Monday, etc.).
- Fully client‑side, no backend involved.
About EveryTool
EveryTool is built on a single principle: your data doesn’t leave your browser. There are no file uploads to a server, no accounts, and no usage tracking—just fast, privacy‑first tools that run in a browser tab.
- Stack: Next.js App Router + TypeScript + TailwindCSS, deployed on Vercel.
- UUID generation: Uses the Web Crypto API directly instead of an external library.
Tool Categories
We now have 33+ tools across four categories:
- Image Tools 🖼️
- PDF Tools 📄
- Calculator Tools 🧮
- Developer Tools 🛠️
The Developer Tools category is the most active right now. Recent additions include:
- Base64 Encoder/Decoder
- URL Encoder/Decoder
- Hash Generator
- JWT Decoder
- Regex Tester
- Color Code Converter
I’m continuing to expand this category. If there’s a tool you constantly Google or copy‑paste from Stack Overflow, let me know in the comments—it might be next on the list.
Try the Tools
👉 Try the tools at everytool.solutions
Follow the development in public on Twitter/X and LinkedIn for updates.