DataFormattools
JSON · Generator

JSON Schema Generator

Generate standard JSON Schema (Draft-07 / 2020-12) from sample JSON online. Informs property types, required fields, and array item definitions.

Interactive Editor
Sample JSON Data
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Auto-executes on edit
Generated JSON Schema (Draft-07)
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100% In-Browser Privacy: All conversions, formatting, and validations run purely on your machine using client-side JavaScript. Your data, code snippets, and environment variables are never transmitted to any server or recorded in logs.
Specifications

How JSON Schema Generator Works

  • Infers JSON Schema Draft-07 data types from supplied values.
  • Builds nested object schemas with recursive property mappings.
  • Generates the required array containing all top-level keys.
Demonstration

Example Input & Output

Analyzes field names, value types, and array elements to synthesize a complete Draft-07 JSON Schema with a defined properties map and required keys list.

Sample JSON Data
{
  "productId": 42,
  "productName": "Wireless Keyboard",
  "price": 49.99,
  "tags": ["electronics", "hardware"],
  "inStock": true
}
Generated JSON Schema (Draft-07)
{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "productId": {
      "type": "integer"
    },
    "productName": {
      "type": "string"
    },
    "price": {
      "type": "number"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "inStock": {
      "type": "boolean"
    }
  },
  "required": [
    "productId",
    "productName",
    "price",
    "tags",
    "inStock"
  ]
}
Applications

Common Use Cases

OpenAPI / Swagger Specs

Create payload validation schemas for REST API documentation.

Form Validation

Build schemas for dynamic form generators like react-json-schema-form.

Guidelines

Key Specifications & Gotchas

Integer vs Number

Whole numbers are inferred as integer while decimals are typed as number.

Questions

Frequently Asked Questions

What version of JSON Schema is generated?

The generator outputs standard JSON Schema Draft-07 compatible with OpenAPI 3.0 and modern validators.

Can I customize required properties?

The generated schema includes all root properties in the required array, which you can easily adjust.

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