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Jack Green
Jack Green

Posted on Originally published at tools.jackgreen.top

I Built a Free JSON Schema Visualizer (Because StopLight Charges $299/User/Month)

#javascript #webdev #productivity #opensource

I Built a Free JSON Schema Visualizer (Because StopLight Charges $299/User/Month)

Last quarter I was helping a team document their REST API. They needed to visualize their JSON Schema as a clean diagram for their engineering wiki.

I opened StopLight. Found a decent template. Pasted the schema. Hit generate.

It worked. But then I saw the price: $299 per user per month. For a tool my team would use once a week.

So I built something better that afternoon.

The Problem

StopLight is powerful — if you're an enterprise API team. But for indie developers, small teams, and anyone who just needs a quick schema diagram, it's overkill and overpriced:

  1. $299/user/month — for a visualization tool you barely use
  2. Account required — your schema lives on StopLight's servers
  3. Subscription lock-in — cancel and your diagrams go with it
  4. No offline use — you need internet to access your work

It's like renting a Ferrari to drive to the grocery store.

What I Built

JSON Schema Visualizer — a purpose-built, free, browser-based tool for visualizing JSON Schema as interactive diagrams.

  • No account. Open the page, paste your schema, visualize.
  • No subscription. Free forever — no "Pro" tier, no watermarks.
  • No data collection. Everything runs in your browser. Your schema never leaves your device.
  • Works offline. Once loaded, you don't need internet.
  • Export to PNG/PDF. One-click download for your docs.

Features

  • Interactive tree diagrams — Click to expand or collapse schema nodes
  • Dark mode — Easy on the eyes for late-night API work
  • Zoom and pan — Navigate large schemas with ease
  • PNG export — Download high-quality images for your documentation
  • PDF export — Via browser print dialog
  • Privacy first — 100% client-side, zero network calls

Why It Matters

API documentation is critical, but it shouldn't cost $299/month. Whether you're a solo developer documenting your first REST API or a small team building internal tools, your schemas should be private and your tools should be free.

This tool exists because that choice shouldn't exist.

Try It

Visualize your JSON Schema for free →

Built for developers who want clean diagrams, not expensive subscriptions.

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