json-schema-generator

Generate JSON Schema automatically from JSON data. Validate APIs, enforce data contracts, and ensure consistency across frontend and backend systems.

Input JSON

Or drop a file here.

Formatted Output

What is a JSON Schema?

JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It defines the structure, data types, required fields, and constraints of JSON data. JSON Schema is widely used in API development, configuration validation, and data exchange between systems.

By using a JSON Schema Generator, developers can automatically create schemas from sample JSON data instead of writing them manually. This saves time, reduces errors, and ensures consistency across teams.

How the JSON Schema Generator Works

Paste or upload a valid JSON document.
The tool analyzes the structure and data types.
A JSON Schema is generated automatically.
You can copy or download the generated schema.

The generated schema follows standard JSON Schema specifications and can be used with popular validators, frameworks, and API tools.

Common Use Cases

Validating API request and response payloads
Defining data contracts between frontend and backend
Validating configuration files
Generating documentation for JSON-based APIs
Ensuring data consistency in microservices

Why Use This JSON Schema Generator?

Unlike many online tools, this JSON Schema Generator runs primarily in your browser. Your JSON data is not uploaded to a server unless explicitly stated. The tool is fast, developer-friendly, and designed to handle real-world JSON structures.

It supports nested objects, arrays, optional fields, and multiple data types, making it suitable for both simple and complex schemas.