I Built 50 Free Browser-Based Developer Tools - No Signup, No Server Calls

Every developer has that moment: you need to decode a JWT, format some JSON, or convert a timestamp — and you end up on a sketchy site plastered with ads that may or may not be uploading your data to a server in who-knows-where. I got tired of it, so I built DevToolBox — a collection of 50 free, browser-based developer tools. No signup, no server calls, no tracking. Everything runs in your browser using plain JavaScript. What's Inside Here's a quick overview of the tool categories: Formatters & Validators JSON Formatter & Validator — Pretty-print, minify, and validate JSON with syntax highlighting HTML Formatter — Beautify messy HTML SQL Formatter — Format SQL queries with keyword uppercasing XML Formatter — Indent and validate XML CSS & JavaScript Minifiers Encoders & Decoders Base64 Encode/Decode — Text and file encoding URL Encode/Decode — Handle special characters in URLs JWT Decoder — Inspect JWT headers, payloads, and expiry HTML Entity Encoder — Named, numeric, and hex entities