Can one sample produce a perfect schema?

No. It gives a strong starting point. Arrays of multiple objects help infer optional fields and mixed primitive types.

Is this uploaded to a server?

No. JSON parsing and schema generation run in your browser.

JSON

JSON Schema Generator

Turn real API examples into a starting JSON Schema. Paste a sample object or array and get a draft 2020-12 schema you can refine for validation and docs.

Schema title

Arrays are inferred from all items, object fields are merged across samples, optional fields get x-requiredConfidence, and strings can detect email, uri, date-time, date and uuid formats.

sample.json

schema.json

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "GeneratedSchema",
  "type": "object",
  "required": [
    "id",
    "type",
    "amount",
    "paid",
    "customer",
    "items"
  ],
  "x-requiredConfidence": {
    "id": 1,
    "type": 1,
    "amount": 1,
    "paid": 1,
    "customer": 1,
    "items": 1
  },
  "properties": {
    "id": {
      "type": "string"
    },
    "type": {
      "type": "string"
    },
    "amount": {
      "type": "integer"
    },
    "paid": {
      "type": "boolean"
    },
    "customer": {
      "type": "object",
      "required": [
        "email"
      ],
      "x-requiredConfidence": {
        "email": 1
      },
      "properties": {
        "email": {
          "type": "string",
          "format": "email"
        }
      }
    },
    "items": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "sku": {
            "type": "string"
          },
          "qty": {
            "type": "integer"
          }
        },
        "required": [
          "sku",
          "qty"
        ],
        "x-requiredConfidence": {
          "sku": 1,
          "qty": 1
        }
      }
    }
  }
}

runtime

Browser-local execution

Inputs stay inside the current tab unless you copy, download or explicitly export.

memory

Session handoff

Magic Paste can pass input to a target tool through sessionStorage, never through the URL.

control

User-owned state

Favorites, recent tools and workflow history are local browser data you can clear from the browser.

smart handoff graph

Suggested next moves

session handoff ready

/web

OpenAPI Mini Inspector

List endpoints, methods and response codes from OpenAPI JSON or common YAML locally.

/json

JSON to TypeScript

Generate TypeScript interfaces from any JSON sample.

/json

JSON Tree Diff

Compare JSON structurally and report changed paths without whitespace noise.

/json

JSONPath Query

Query nested JSON with JSONPath-style selectors and copy matched values.

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How to use

01Paste representative JSON into the left editor.
02Set a schema title.
03Copy the generated schema from the right editor.

FAQ

Can one sample produce a perfect schema?: No. It gives a strong starting point. Arrays of multiple objects help infer optional fields and mixed primitive types.
Is this uploaded to a server?: No. JSON parsing and schema generation run in your browser.

Browser-local execution

Session handoff

User-owned state

Suggested next moves

How to use

FAQ

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