JSON Schema Generator

Generate Draft-07 and 2020-12 compliant JSON Schema documents from sample JSON objects.

📋 JSON Schema (Draft-07 / 2020-12) Generator

Convert sample JSON objects into standard JSON Schema specifications for API payload validation, OpenAPI specs, and data contracts.

Schema Title:

Draft:

Mark all fields requiredInclude examples

Sample JSON Input

Generated JSON Schema

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Product",
  "properties": {
    "productId": {
      "type": "string",
      "examples": [
        "prod_98765"
      ]
    },
    "name": {
      "type": "string",
      "examples": [
        "Wireless Noise-Canceling Headphones"
      ]
    },
    "price": {
      "type": "number",
      "examples": [
        299.99
      ]
    },
    "inStock": {
      "type": "boolean",
      "examples": [
        true
      ]
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string",
        "examples": [
          "audio"
        ]
      }
    },
    "dimensions": {
      "type": "object",
      "properties": {
        "weightGrams": {
          "type": "integer",
          "examples": [
            250
          ]
        },
        "foldable": {
          "type": "boolean",
          "examples": [
            true
          ]
        }
      },
      "required": [
        "weightGrams",
        "foldable"
      ]
    }
  },
  "required": [
    "productId",
    "name",
    "price",
    "inStock",
    "tags",
    "dimensions"
  ]
}

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How to use the JSON Schema Generator

Paste your sample JSON payload. Configure your desired JSON Schema specification draft, toggle required fields, and copy the validated schema.

?Frequently Asked Questions

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What is the JSON Schema Generator?

The JSON Schema Generator infers structural data types, object properties, array item contracts, and sample values from sample JSON instances, producing valid JSON Schema documents.

Who is the JSON Schema Generator for?

Used by API architects, backend engineers, and QA automation teams building runtime payload validation, OpenAPI 3.0/3.1 specs, and data pipeline contracts.

How to Use the JSON Schema Generator

Paste your sample JSON payload.
Select your target JSON Schema draft specification (Draft-07, 2020-12, or Draft-04).
Toggle required properties and example values.
Copy the validated schema document.

Worked Calculation Example

Transforming a product payload into a Draft-07 schema with required properties, nested dimensions object validation, and string type constraints.

Frequently Asked Questions

What is JSON Schema used for?

JSON Schema provides a formal standard to validate the structure, data types, and required fields of JSON documents at runtime in REST APIs, configuration files, and database records.

Which JSON Schema draft should I use?

Draft-07 is recommended for maximum compatibility across Ajv, Python jsonschema, and OpenAPI 3.0 tools. 2020-12 is ideal for modern greenfield projects.

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