JSON Schema Generator

Generate JSON Schema (Draft 7) from any JSON object or array with recursive type detection and required fields.

📐 JSON Schema Generator

Generate a JSON Schema (Draft 7) from any JSON object or array

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Paste JSON above and click "Generate" to create a JSON Schema

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What is a JSON Schema Generator?

A JSON Schema generator is a tool that takes a sample JSON object or array and automatically creates a JSON Schema definition that describes its structure. JSON Schema is a declarative language for validating the format, types, and constraints of JSON data: widely used in API documentation (OpenAPI/Swagger), form validation, and data pipeline contracts.

CodeHelper's JSON Schema Generator produces Draft 7 schemas with recursive type detection for nested objects, arrays with merged item types, integer vs number distinction, and optional required fields and description placeholders.

Key Features

  • Draft 7 Output: Generates schemas compliant with the JSON Schema Draft 7 specification.
  • Type Detection: Identifies string, number, integer, boolean, null, object, and array types automatically.
  • Nested Objects: Recursively builds schema definitions for deeply nested structures.
  • Array Merging: Analyzes all items in an array to build a unified items schema.
  • Required Fields: Toggle to mark all present properties as required.

How to use the JSON Schema Generator

  1. Paste a sample JSON object or array into the input.
  2. Optionally set a schema title and toggle required/description options.
  3. Click Generate to produce the JSON Schema.
  4. Copy or download the schema for use in your project.

Whether you are documenting REST APIs, building form validators, or setting up data contracts between services, this free JSON Schema generator saves you from writing schemas by hand.