I built 100+ free developer tools — here's what I learned

Why I built this Every time I needed a quick JSON formatter or a UUID generator, I'd Google it and land on some ad-heavy site that barely worked on mobile. So I decided to build my own. Six months later, FreeToolkit has 100+ tools and I learned a lot along the way. What I built FreeToolkit is a free collection of browser-based utilities for developers. No login, no ads, no data sent to any server. Some of the most useful ones: JSON Formatter & Validator — paste messy JSON, get clean output JWT Decoder — decode any JWT token instantly Regex Tester — test regex with live match highlighting UUID Generator — v4 UUIDs with one click Hash Generator — MD5, SHA1, SHA256, SHA512, bcrypt Color Converter — hex, RGB, HSL, CMYK SQL Formatter — clean up messy queries instantly What I learned building 100+ tools 1. Scope creep is real I started with 10 tools. Each one suggested 3 more. Set a limit early. 2. Browser APIs are powerful 90% of these tools need zero server. Crypto, encoding, parsing —