DevToolKit

JSON Schema Generator

Generate high-quality JSON Schemas from your data instantly. Supports Draft 7, automatic type inference, required field toggles, and AJV validation. 100% private.

Contract Utility

Schema Architect

Global Options

Required by Default
Infer Default Values
Suggest Enums

Validation Sandbox

JSON Sample Data
Generated JSON Schema
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How to Use

The JSON Schema Generator is a professional workbench for architecting API contracts and validating data structures.

How to use this tool

  1. Sample Input: Paste your sample JSON data into the left editor. The tool will instantly infer the structure.
  2. Configure Options: Choose the schema draft version (Draft 7 or 2020-12). Toggle whether fields should be required by default and if example values should be mapped to the default keyword.
  3. Validation Sandbox: Use the "Validation Sandbox" in the sidebar to test your generated schema against new data points in real-time.
  4. Refine: Tweak your sample data to add nested objects or arrays; the generator handles arbitrary depth automatically.
  5. Integrate: Copy the resulting JSON Schema for use in your API documentation, OpenAPI specs, or validation libraries like AJV.

About This Tool

Industrial-Grade Schema Inference

JSON Schema is the industry standard for describing data formats. Manually writing schemas is error-prone and tedious. Our tool uses advanced inference algorithms to correctly identify data types, formats, and hierarchical relationships.

By integrating the AJV validation engine, we allow you to verify the integrity of your schema immediately, reducing the feedback loop between design and implementation.

Why Use This Tool

Security & Privacy

Your data models and API signatures are sensitive intellectual property. Most online generators send your samples to a server for processing. DevToolKit's generator runs **completely locally** in your browser memory. Your data never leaves your device, making it safe for use with proprietary corporate specifications.

FAQ

What is JSON Schema?
JSON Schema is a vocabulary for annotating and validating JSON documents. It defines the expected structure, data types, allowed values, and constraints. It is the standard for documenting and validating API contracts.
Which JSON Schema versions are supported?
It generates schemas compatible with Draft 7, which is the most widely supported version by validation libraries such as AJV, jsonschema (Python), and JSON.NET.
Can I mark fields as required?
Yes. The tool lets you configure which fields are required in the generated schema. By default, all detected fields are marked as required.
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