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JSON to JSON Schema

Generate JSON Schema Draft 2020-12 from JSON instantly. Build schemas for OpenAPI, API validation, AJV, Swagger and modern applications with secure processing.

Options

Input JSON

Paste or edit your JSON sample

JSON Schema output

Draft 2020-12 schema document

Ready
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Root",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer"
    },
    "name": {
      "type": "string"
    },
    "email": {
      "type": "string"
    },
    "active": {
      "type": "boolean"
    },
    "score": {
      "type": "number"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "profile": {
      "type": "object",
      "properties": {
        "age": {
          "type": "integer"
        },
        "city": {
          "type": "string"
        }
      },
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}

Why JSON to JSON Schema?

JSON Schema powers OpenAPI specs, form validators, and contract testing pipelines.

This page presets JSON Schema output so you can paste API JSON and ship typed code faster.

FAQ

How do I convert JSON to JSON Schema?

Paste your JSON sample into the editor on this page. The JSON Schema output updates live — copy it or download a .json file.

Is JSON to JSON Schema conversion free?

Yes. JSON to JSON Schema conversion on WebioTools is free for normal usage and runs in your browser.

Is my JSON data sent to a server?

No. Code generation happens locally in your browser. Your JSON never leaves your device.

Can I use this for API responses?

Absolutely. Paste REST or GraphQL JSON responses to scaffold JSON Schema definitions for your project.