I built a free JSON tool suite for developers

I’m a frontend developer, and like most of you, I work with JSON every single day. Formatting, validating, converting, comparing… and constantly jumping between different tools 😅

So I decided to build my own.
👉 https://formatjsononline.com/

What it does
It’s a free, fast, browser-based JSON tool suite focused on developer productivity.

Currently supports:
• JSON Formatter (pretty + minify)
• JSON Validator
• JSON Compare
• JSON Filter
• JSON Minify
• JSON → XML / CSV / String
• JSON Path Finder
• Schema Validator
• Dummy JSON & Dummy API generator
• Batch JSON processing
• cURL generation from JSON (useful for API testing)

No signup. No paywall. Works instantly.

Why I built it
• Existing tools were either slow, cluttered with ads,
• I wanted one clean place with everything
• Also using this as a long-term indie project + SEO experiment

Tech stack
• Next.js
• Fully client-side for privacy
• Optimized for page speed & SEO

Current status
• Live and stable
• Growing slowly via organic search
• No monetization yet (intentionally)

What I’m looking for
• Honest feedback (UI, missing features, UX)
• Ideas for one paid feature that developers would actually pay for
• Suggestions to improve retention

If you work with JSON (which is basically everyone here 😄), I’d love your thoughts.

Thanks for reading