4 free JSON tools every developer needs (that I built this weekend)

I've been building SnapAPI — a tool that turns JSON into REST APIs instantly — and along the way I built some standalone JSON utilities that I use daily. They're all free, no signup, and work right in your browser. 1. JSON Formatter Try it → Paste messy JSON, get it beautifully formatted. Also has a minify button for when you need compact JSON. I use this dozens of times a day when debugging API responses. 2. JSON Validator Try it → Real-time validation as you type. Shows you exactly where the syntax error is, plus structural info (number of keys, array lengths, nesting depth). 3. JSON to TypeScript Try it → Paste an API response, get TypeScript interfaces. Handles nested objects, arrays, and mixed types. Saves me from writing interfaces by hand. 4. Fake Data Generator Try it → Define fields and types, get realistic mock data instantly. Supports names, emails, numbers, dates, UUIDs, and more. Perfect for: Seeding a database Testing UI components Creating demo data Bonus: Turn your JSON