The latest articles on DEV Community by Kaewkamphon Suesirithamrong (@kkp). https://dev.to/kkp https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4175733%2F248d4521-ec1d-4388-9e24-1e014789ed72.png https://dev.to/kkp en Kaewkamphon Suesirithamrong Tue, 13 Oct 2026 10:23:42 +0000 https://dev.to/kkp/i-built-a-set-of-developer-tools-that-run-entirely-in-your-browser-3pjc https://dev.to/kkp/i-built-a-set-of-developer-tools-that-run-entirely-in-your-browser-3pjc <p>I kept pasting JWTs, JSON with real customer data, and config files into random online tools, and never knew where that data went. So I built <strong>DevTrove</strong>: <a href="https://dev-trove.com" rel="noopener noreferrer">https://dev-trove.com</a></p> <h2> What it is </h2> <p>22 free developer tools: JSON formatter and validator, JSON Schema validator, JSON semantic diff, YAML ↔ JSON, CSV ↔ JSON, JWT decoder and encoder/verifier, Base64, URL and HTML encoding, hash and password generators, a regex tester, a cron explainer, a timestamp converter, and more.</p> <h2> How it handles your data </h2> <ul> <li>Your input is processed in your browser. Tools don't send it to a server, store it, or put it in the URL.</li> <li>No analytics, no ads, no sign-up.</li> <li>Heavy tools (regex, YAML, JSON diff and schema validation) run in a Web Worker with a timeout, so a catastrophic regex can't freeze the page.</li> <li>The JWT tools use the Web Crypto API, reject <code>alg: none</code>, and enforce minimum HMAC key lengths.</li> </ul> <h2> Stack </h2> <p>Next.js, React, TypeScript. Each tool has unit tests and Playwright end-to-end tests, including accessibility checks on desktop and mobile.</p> <h2> I'd love feedback </h2> <ul> <li>Which tool do you reach for that's missing?</li> <li>Anything that feels slow, confusing, or broken on your device?</li> </ul> <p>Thanks for reading!</p> webdev privacy javascript tools