About DevPenh

DevPenh is a small collection of free utilities for everyday development work: formatting and comparing JSON, inspecting JWTs, URL encoding and converting timestamps. It is built and maintained by an independent developer.

Principles

• Local processing. Tools run in your browser. Input is not sent to a server operated by this site.
• Correctness over features. Each tool documents its exact behaviour and limitations, such as how arrays are compared or when numbers lose precision.
• No accounts. There is nothing to sign up for.
• Open-source foundations. The site is built with open-source software including Next.js, React, Tailwind CSS and Lucide icons.

Funding

The site may in future show clearly labelled advertising or recommend relevant products through affiliate links to cover its costs. Any such placements will be disclosed and kept away from tool input and output. See the privacy policy for details.

Feedback

Found a bug or an incorrect explanation? Please get in touch.