I Built a Privacy-First Developer Toolbox — Everything Runs in Your Browser

The Problem Every developer has been here: you need to decode a JWT from production, format a JSON response with customer data, or test a regex against real log entries. So you Google "JWT decoder" and land on some random site plastered with ads, cookie banners, and — here's the kicker — your data gets sent to their server . Most online developer tools phone home. Your production tokens, API responses, and customer data pass through someone else's infrastructure. We've all done it without thinking twice. I decided to build something better. DevToolbox DevToolbox is a suite of developer utilities that runs entirely in your browser . No server calls. No tracking. No ads. Your data never leaves your machine. Tools available now: 🔧 JSON Formatter — Format, validate, and minify JSON with syntax highlighting and a collapsible tree view. Handles large payloads without breaking a sweat. 🔐 Base64 Encoder/Decoder — Encode and decode text or files. Supports URL-safe Base64. Drag-and-drop file upl