JSON to JSON Schema Generator

Generate JSON Schema from JSON data online. Create validation schemas with proper types, required fields, and nested structures. Free and instant.

Title:

JSON 入力

JSON Schema

About JSON to JSON Schema Conversion

JSON Schema is a vocabulary for annotating and validating JSON documents. It's widely used for API documentation (OpenAPI/Swagger), form generation, configuration validation, and data interchange. This tool analyzes your JSON data and generates a JSON Schema (draft-07) that describes its structure. It correctly identifies types, marks all existing fields as required, handles arrays with item schemas, and creates nested schemas for objects. The output can be used with any JSON Schema validator or integrated into OpenAPI specifications. All processing happens in your browser.

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How to Use

Paste your JSON data into the input panel
Set the schema title
Click Convert to generate the JSON Schema
Copy the schema for use with validators or API docs

Common Use Cases

Creating JSON Schema for OpenAPI/Swagger documentation
Generating validation schemas for REST APIs
Building configuration file validators
Documenting data structures for team collaboration

Frequently Asked Questions

What JSON Schema draft is used?

The tool generates schemas following JSON Schema draft-07, which is widely supported by validators and tools.

Are all fields marked as required?

Yes. Since the tool infers the schema from sample data, all present fields are marked as required. You can adjust this manually after generation.

Does it handle nested objects?

Yes. Nested objects generate nested schema definitions with their own properties and required arrays.

Can I use this with OpenAPI/Swagger?

Yes. The generated JSON Schema is compatible with OpenAPI specifications. You can paste the schema into your API documentation.