I built Castov – 900+ Offline-First Developer Tools, Terminal Error Healer & VS Code Extension (Zero Telemetry) published: true

Hey fellow developers! 👋

I got tired of pasting sensitive JWT tokens, .env secrets, and production JSON payloads into slow, ad-heavy websites that log everything on their backend.

So I built Castov — a 100% client-side, zero-telemetry developer utility suite.

⚡ What makes it different?

1. Terminal Error Healer (npx castov fix): Pipe any failed build or error message directly in your terminal to get an instant root-cause diagnosis:

bash
   npx castov fix "EADDRINUSE: address already in use :::3000"
Zero-Knowledge .env Secret Sharing: Encrypts your .env variables in the browser using AES-GCM 256-bit and stores the decryption key in the URL #hash (so the key never touches the server): 👉 https://www.castov.com/env-vault

One-Line .cursorrules Terminal API: Fetch battle-tested AI rules directly into your project:

bash
curl -sL https://www.castov.com/api/rules/nextjs-15 > .cursorrules

Network Ports & CIDR Subnet Encyclopedia: Instant lookup for TCP/UDP ports with copy-paste OS process kill commands (lsof, netstat, npx kill-port) and Docker rules: 👉 https://www.castov.com/ports

Official VS Code Extension: Hover over any Unix timestamp to see UTC/Local time, generate UUID v7, and decode JWTs inside your editor:

bash
code --install-extension castov.castov-vscode

👉 VS Code Marketplace Link

Explore the full directory of 900+ tools and references here: https://www.castov.com/directory

Would love to hear your feedback and feature requests!