JSON to JSON Schema Converter - Generate Schema from JSON Online

📋 JSON to JSON Schema

Automatically generate JSON Schema definitions from JSON sample. Perfect for API documentation and validation.

📝 Input JSON:
📤 Output JSON Schema:
// JSON Schema will appear here...
Definitions: 0
Properties: 0
Nested: 0
💡 Example JSON Samples:
👤 User Object
Simple user with basic fields
🛍️ Product with Nested
Product with nested category and tags
📡 API Response
Typical API response structure

Online JSON to JSON Schema Converter: Automate Your Data Validation

Create robust data structures in seconds with our JSON to JSON Schema converter. Manually writing a schema for complex data is time-consuming and prone to syntax errors. This tool allows you to paste any JSON object and instantly infer a valid JSON Schema, providing the perfect foundation for data validation, automated testing, and interactive API documentation.

Why Use a JSON to JSON Schema Converter?

JSON Schema is the industry standard for defining the structure and constraints of JSON data.

Speed Up API Documentation

If you are using tools like Swagger or OpenAPI, you need JSON Schemas to define your request and response bodies. Instead of building these from scratch, our tool takes your sample data and generates the schema for you, ensuring your documentation always matches your implementation.

Reliable Data Validation

By generating a schema from your real-world data, you can use validation libraries (like AJV for Node.js) to ensure that incoming data meets your requirements. This helps catch malformed requests before they reach your database.

Key Features of Our Schema Generator

Our tool is built to handle modern JSON standards and complex data hierarchies.

1. Support for Multiple Drafts

Different projects require different schema versions. Our converter can generate output for:

  • Draft 4: Widely used in legacy systems.

  • Draft 7: The most common version for modern APIs.

  • Draft 2020-12: Supports the latest features in the JSON Schema ecosystem.

2. Deep Type Inference

Our engine doesn't just look at the surface. It analyzes values to determine:

  • Strings: Detects specific formats like email, date-time, and hostname.

  • Numbers: Distinguishes between integer and number (floats).

  • Objects & Arrays: Recursively builds definitions for nested structures.

3. Smart "Required" Detection

The tool automatically identifies keys at the root and nested levels, adding them to the required array to ensure your schema is as strict or as flexible as you need it to be.

How to Convert JSON to JSON Schema

  1. Paste your JSON: Insert your raw JSON payload into the input editor.

  2. Select Options: Choose the schema draft version and whether you want to include descriptions or titles.

  3. Generate: The tool instantly processes the data and displays the JSON Schema.

  4. Validate & Copy: Review the schema, then copy it for use in your code or documentation tools.

Technical Insights: Schema Inferencing

Handling Arrays of Objects

When our tool encounters an array of objects, it scans all items in the array to build a comprehensive items definition. This ensures that if one object has a field that another lacks, the schema accurately reflects the optional nature of that field.

Metadata Support

You can easily add title, description, and default values to your generated schema. This is highly useful for creating self-documenting APIs where the schema explains the purpose of each field.

Frequently Asked Questions (FAQ)

What is JSON Schema used for?

JSON Schema is used for validating JSON data structure, documenting APIs, and generating automated tests or even UI forms based on data definitions.

Is this tool compatible with OpenAPI?

Yes! The schemas generated here are fully compatible with the components/schemas section of OpenAPI 3.0 and 3.1 specifications.

Is my data secure?

Absolutely. All conversion logic happens locally in your browser. Your JSON data is never uploaded to our servers, keeping your proprietary data structures 100% private.