Developer builds 31 browser-based tools in a weekend to avoid ad-heavy alternatives

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A developer created DevKits, a free collection of 31 developer utilities spanning categories like JSON formatting, encoding, security, and AI token counting, all accessible at devkits.vip. The project was motivated by frustration with existing tools that display ads, track users, and upload sensitive input data such as JWTs to remote servers. Every tool in DevKits runs entirely client-side in the browser, with no accounts, cookies, or cross-site tracking required. The site is built with Next.js 15, TypeScript, and Tailwind CSS, hosted on Vercel, with an initial JavaScript payload kept under 130KB per page. All 31 tools are managed through a single configuration file, making it possible to add a new tool in roughly 20 minutes.

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