All My Favorite Dev Tools Were on 10 Different Websites. So I Built One With Everything

I've been using JSON formatters, cron schedulers, password generators and Base64 encoders since my first day as a web developer. Always jumping between tabs, always the same ugly interfaces from 2012.

Then last year JSONFormatter.org and CodeBeautify.org made the news — years of user data exposed. Passwords, API keys, cloud credentials. Stuff developers had been pasting there assuming it was safe.

That was enough for me.

So I built devessentials.dev — a collection of the tools I actually use, running 100% in your browser. No backend. No server ever sees what you paste. You can verify it yourself: open
DevTools → Network tab, use any tool, watch zero requests go out.

What's in it

• JSON Formatter, Validator & Beautifier
• JWT Decoder & Debugger
• Hash Generator (MD5, SHA-256, SHA-512)
• Base64 Encoder/Decoder
• UUID Generator (v1, v4, v7)
• Password Generator & Strength Checker
• Cron Builder
• Diff Checker
• URL Encoder/Decoder
• JSON ↔ YAML, JSON ↔ CSV converters
• JSON Repair (great for fixing broken LLM output)

Tech

Built with Next.js 15, fully static. No ads, no login, no analytics on your inputs.

What's next

Adding more tools as I need them. Feedback welcome.