JSON Schema Explorer
Paste a JSON Schema and read it like a map — an interactive tree of every property, type, required flag and constraint, plus a generated example instance that conforms to it. Parsed entirely in your browser.
{
"id": "string",
"status": "pending",
"customer": {
"name": "string",
"email": "user@example.com"
},
"items": [
{
"sku": "string",
"qty": 1,
"price": 0
}
],
"total": 0
}Schema structure
Reading a schema without reading the braces
A JSON Schema is dense by design — deeply nested objects, required arrays that live one level up from the fields they govern, and constraints scattered across keywords. Read as raw text it's easy to miss that email is required inside customer but the customer object itself is optional, or that an array's items have their own required set. The tree view collapses that cognitive load: each property shows its type, its scoped required flag and its constraints on one line.
The single most useful output, though, is the example instance. Most of the time you don't want to study a schema — you want a payload that satisfies it, to drop into a request, a fixture or a mock. The generator walks the schema and emits exactly that, preferring your declared default and examples values, honouring enum and format, and falling back to type-appropriate placeholders only where nothing better is specified.
Because everything runs locally, you can paste schemas you'd never send to a third-party service, and the view updates the instant your JSON becomes valid — so it doubles as a quick syntax check while you're authoring. When you need to compare two versions of a schema, or document a whole API rather than one model, reach for the related tools below.
Drilling into a single model here pairs naturally with the OpenAPI Documentation Generator for whole specs and the GraphQL Schema Visualizer for graph APIs.
Trusted by API & Backend Engineers
“Pasting a gnarly nested schema and immediately getting a readable tree plus a valid sample payload is exactly what I needed. The required markers being scoped per-object is correct and saved me from a real bug. No upload, works on our internal schemas.”
“The example generator honours formats and defaults, so the sample it spits out is actually usable as a fixture rather than a bunch of empty strings. I use it constantly when reviewing other teams' schemas.”
“Great for understanding response shapes before writing tests. Collapsible tree makes big schemas manageable. I'd like in-line $ref resolution, but for a single schema object it's already my go-to.”
“I document APIs and this turns a schema into something I can actually describe — types, constraints and a clean sample I can paste into the docs. The fact that it's instant and private makes it part of my daily workflow.”
Love using our calculator?
Related API tools
Related Articles
Dive deeper with our expert guides and tutorials related to JSON Schema Explorer
interactive tree · constraints · sample instance · in-browser · Last reviewed: 2026-06