JSON to Schema Converter

Generate JSON Schema from JSON data automatically

Schema Version:

Include ExamplesInclude Descriptions

JSON Input

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JSON Schema Output

JSON Schema will appear here

Paste JSON in the input area to get started

How to Generate JSON Schema - Step by Step Guide

Step 1

Input Your JSON Data

Let's get your JSON data ready for schema generation! You have several convenient options:

•

Paste directly: Copy your API response or JSON data and paste it into the input editor

•

Upload a file: Click "Upload" to select a .json or .txt file from your computer

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Try the sample: Click "Sample" to load example data and see how the schema generator works 😊

Example: Sample JSON Input

Here's what sample JSON data looks like:

{
  "planId": "TEL-UNLIMITED-5G",
  "planName": "Unlimited 5G Premium",
  "provider": "TelecomCorp",
  "pricing": {
    "basePrice": 89.99,
    "currency": "USD",
    "billingCycle": "monthly"
  },
  "features": [
    "unlimited_data",
    "5g_access",
    "international_roaming"
  ],
  "isActive": true
}

Step 2

Configure Schema Options

Customize your schema generation! 🎛️ Choose the JSON Schema version and additional options:

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Schema Version: Choose from Draft 2020-12 (latest), 2019-09, 07, or 06

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Include Examples: Add your original JSON as example data in the schema

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Include Descriptions: Add helpful titles and descriptions to make schemas self-documenting

Example: Schema Configuration Options

The tool automatically analyzes your JSON and applies these settings: ⚙️

✓Draft 2020-12 selected (latest standard)

✓Examples included for validation testing

✓Descriptions added for better documentation

Step 3

Automatic Schema Generation

Watch the magic happen! 🎉 The tool instantly analyzes your JSON and generates a complete JSON Schema with validation rules:

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Type inference: Automatically detects string, number, boolean, object, array, and null types

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Required fields: Identifies which properties are required based on your data structure

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Nested validation: Creates sub-schemas for nested objects and arrays

Example: Generated JSON Schema Output

Your input JSON becomes this comprehensive schema: ✨

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "title": "Generated Schema",
  "properties": {
    "planId": {
      "type": "string"
    },
    "pricing": {
      "type": "object",
      "properties": {
        "basePrice": { "type": "number" }
      }
    },
    "features": {
      "type": "array",
      "items": { "type": "string" }
    }
  },
  "required": ["planId", "pricing", "features"]
}

Step 4

Export Your Schema

Get your schema ready for use! 🚀 Multiple export options make it easy to integrate into your workflow:

•

Copy to clipboard: One-click copying for quick pasting into your code editor or application

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Download as file: Save as a .json schema file for use in validation libraries

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Real-time validation: Green checkmark confirms your schema is valid and ready to use

Example: Common Use Cases

Perfect for API development, validation, and documentation: 🔥

✓ API Request/Response Validation: Validate incoming data against your schema

✓ Configuration Files: Define and validate app configuration structures

✓ Form Generation: Auto-generate forms from schema definitions

✓ Documentation: Self-documenting schemas with examples and descriptions

What is JSON Schema? 🔍

JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It provides a contract for JSON data, describing the structure, data types, and validation rules that JSON data should follow.

Think of JSON Schema as a blueprint that defines what valid JSON should look like, ensuring data consistency and enabling automatic validation across different systems and applications.

Common Use Cases 💼

Development & APIs

• API request/response validation
• Configuration file schemas
• Form generation and validation
• Code generation from schemas

Documentation & Testing

• Self-documenting data contracts
• Test data generation
• Database schema validation
• Integration testing schemas

Frequently Asked Questions

What is the difference between JSON and JSON Schema?

JSON is a data format for storing and exchanging data, while JSON Schema is a specification that defines the structure, data types, and validation rules for JSON data. JSON Schema acts as a contract that describes what valid JSON should look like.

Which JSON Schema version should I use?

For new projects, use Draft 2020-12 as it's the latest stable version with the most features. However, if you're working with existing systems, Draft 07 is widely supported. Check your validation library's compatibility first.

Can I validate JSON data against the generated schema?

Yes! The generated schema works with any JSON Schema validation library in your preferred programming language. Popular libraries include Ajv (JavaScript), jsonschema (Python), and many others.

How does the tool handle complex nested objects?

The converter automatically analyzes nested objects and creates appropriate sub-schemas. Each nested object becomes its own schema definition with proper property types and requirements.

What happens with arrays containing different data types?

When arrays contain mixed data types, the tool creates an "anyOf" schema that allows any of the detected types. This provides flexible validation while maintaining type safety.

Is the JSON Schema generator completely free?

Yes, completely free with no limitations on file size, usage frequency, or features. No registration required, and you can generate unlimited schemas with full validation support.

JSON to Schema Converter - Generate JSON Schema Online