JSON Schema Generator

Convert JSON to Schema instantly. Infer types, detect formats, generate validation rules—perfect for API specs and TypeScript. 100% in your browser.

🔒 All processing is done locally in your browser. Your data is never sent to any server.

Schema Options

Include required fieldsAllow additional propertiesInclude examples

Schema $id (optional)

Schema title (optional)

JSON Input

Generated JSON Schema

Free JSON to Schema Converter Online

Need to convert JSON to JSON Schema? Paste your sample JSON and instantly generate a valid JSON Schema (Draft-07). Our schema inference tool auto-detects data types, recognizes formats like email, date-time, and UUID, and lets you configure required fields. Perfect for OpenAPI specs, Swagger documentation, TypeScript type generation, or Zod schema creation.

1When to use this tool?

💡Generate JSON Schema for OpenAPI 3.0 / Swagger API documentation

💡Create validation schemas for REST API request/response

💡Convert JSON to TypeScript interfaces or Zod schemas

💡Document API payloads for team collaboration

💡Build form validation rules from sample data

💡Validate configuration files (package.json, tsconfig, etc.)

2Features

Convert JSON to JSON Schema with automatic type inference
Detect data types: string, number, integer, boolean, array, object, null
Recognize formats: date, date-time, email, uri, uuid, ipv4, ipv6
Configure required fields and additionalProperties settings
Add $id, title, and description metadata
Include example values from your sample data
Export as .schema.json for validators, OpenAPI, or code generators
100% client-side—your JSON data never leaves your browser

3How to Use

Paste or type your sample JSON data in the input panel.
Configure schema options: required fields, additional properties, include examples.
Optionally add $id and title metadata to your schema.
Click 'Generate Schema' to convert JSON to schema instantly.
Copy to clipboard or download the .schema.json file.