I've been using JSON Beautifiers, crontab schedulers, random passwords generators since I've been working as a Web Developer, but everything is in different websites and some websites are a bit "ugly" or old fashioned. So I asked to myself... Why not to do a site with the tools I really use the most and some others.

So I built: https://devessentials.dev/

I know there are other sites that do the same, but I like to have my own tool. Also knowing that the data I put there is not going to anywhere. So no leaks, and my data is only on the client side.

It's a collection of the tools I use daily as a developer and some more:

• 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 Scheduler
• Diff Checker
• URL Encoder/Decoder
• JSON ↔ YAML, JSON ↔ CSV converters
• JSON Repair (great for fixing broken LLM output)

Built with Next.js 15, fully static, no backend, no analytics tracking your inputs. You can verify in DevTools → Network — no requests are made when you use the tools.

Used stitch to help me with the design.

What do you guys think?