Dev.to
7/19/2026
The original title is: "DevKits: 31 privacy-first browser-based developer tools built with Next.js 15"
Original: I built 31 developer tools in a weekend — here's what I learned
Short summary
A developer built DevKits, a privacy-first site with 31 browser-based developer tools across 9 categories including JSON formatting, encoding, JWT decoding, and an AI token counter for GPT-4o/Claude/Gemini. Everything runs client-side with under 130KB first-load JS, zero ads, and zero tracking. The project uses Next.js 15 with static generation, a single config-driven architecture, and deploys to Vercel in minutes.
- •31 client-side dev tools with no ads, tracking, or server uploads
- •Single tools.ts config drives sitemap, metadata, JSON-LD, and internal linking
- •AI token counter for GPT-4o, Claude, and Gemini was the hardest to implement client-side
Generated with AI, which can make mistakes.
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