A lightweight JSON schema builder that lets you define, nest, and edit schema fields in real time without any fuss

This is a small side project built with Next.js, TypeScript, and Tailwind CSS. The idea was simple — make a tool that lets you visually construct a JSON schema and see the output update as you go. Nothing fancy, just something practical that scratches a specific itch.

You can check out the live demo here if you want to poke around before reading further.

The goal was to build a schema editor that stays out of your way and keeps the output clean and valid at all times

Most quick schema tools either output arrays of field definitions or don't support deep nesting — which makes them less useful when you're trying to model something even slightly complex. The requirements for this one were pretty straightforward:

• Real-time editing — changes reflect in the schema output immediately
• Deep nesting support — fields can contain other fields, recursively
• Valid JSON output — the result is always a proper JSON object, not an array of definitions
• Custom key names — you pick the key at every level
• Edit and delete anywhere — not just at the top level

Here's an example of what the output looks like:

{
  "Name": {
    "First Name": "string",
    "Middle Name": "string",
    "Last Name": "string"
  },
  "Phone": "number",
  "Address": {
    "City": "string",
    "State": "string"
  }
}

The output is a plain, nested JSON object — exactly what you'd expect if you wrote it by hand.

A small but complete feature set that covers the basics of interactive schema building without overcomplicating things

The feature list is intentionally minimal. It does what it needs to do:

• Custom Keys — define any key name at any nesting level
• Nested Fields — add child fields inside any existing field, as deep as you need
• Real-time Editing — the schema view updates instantly as you make changes
• Delete Support — remove fields at any level, not just the root
• Minimal UI — built with Tailwind CSS, clean and easy to navigate

It's not trying to be a full-featured schema design tool — it's more of a utility for quickly sketching out a structure. If that's what you need, it works well.