📋 JSON Schema Generator

📝 JSON Data

⚙️ Schema Options

Schema Title:

Description:

Allow additional properties Auto-detect string formats

Mark all properties as required Include example values

💡 Quick Examples

📋 JSON Schema

{{ generatedSchema }}

Generated JSON Schema will appear here...

🚨 JSON Validation Errors

{{ error.type }}: {{ error.message }}

At line {{ error.line }}

✅ Schema Generated

JSON Schema generated successfully! Ready for validation and documentation.

📊 Schema Statistics

Total Properties: {{ schemaStats.totalProperties }}

Required Properties: {{ schemaStats.requiredProperties }}

Nested Objects: {{ schemaStats.nestedObjects }}

Arrays: {{ schemaStats.arrays }}

Type Distribution:

{{ type }}: {{ count }}

⚠️ {{ error }}

ℹ️ About JSON Schema Generator

JSON Schema Generator turns a valid JSON example into a draft-07 JSON Schema that can document and validate the shape of API payloads, configuration files, webhooks, and test fixtures. JSON Schema describes the allowed structure of a JSON instance with keywords such as type, properties, required, items, format, and additionalProperties.

This tool emits $schema: "http://json-schema.org/draft-07/schema#". Draft-07 is documented by the JSON Schema Draft-07 specification index and the JSON Schema Validation vocabulary. The input itself must be valid JSON as defined by RFC 8259.

Practical uses:

Create a starting schema for REST API request and response contracts.
Document webhook payloads, event messages, and configuration files.
Produce validator input for build checks, CI tests, and form validation.
Generate structured examples for OpenAPI components and developer documentation.
Share a machine-readable contract between frontend, backend, and QA teams.

What the generator infers:

JSON value types: object, array, string, integer, number, boolean, and null.
Object properties, nested object schemas, array items, and oneOf for arrays that contain mixed sample types.
required properties from non-null sample values, or every property when "Mark all properties as required" is enabled.
additionalProperties based on the option panel, defaulting to a closed object contract.
Example values, minLength for non-empty strings, simple phone-number patterns, integer detection, and basic numeric bounds for observed values from 0 to 100.
Common string formats when detection is enabled: email, date-time, uri, uuid, ipv4, and ipv6.

Example: a sample object like {"id": 123, "email": "[email protected]", "active": true} becomes an object schema with typed id, email, and active properties, an email format annotation, additionalProperties set from your option, and a required array for fields present in the sample.

Limitations:

A schema inferred from one sample is a draft contract, not proof of every valid production value.
Optional fields, nullable variants, enums, exact string lengths, business rules, and full numeric ranges often need manual review.
Draft-07 features such as $ref, definitions, if/then/else, allOf, and complex patternProperties are not inferred automatically.
Array item schemas are based on sampled elements, so large or highly variable arrays may need extra tightening before use in production validators.

Use the generated schema as a strong first pass, then adjust it to match the real contract your validator, API gateway, or OpenAPI document expects.

Source references:

API Usage Example:

POST /api/tools/webdev/json-schema-generator
Content-Type: application/json

{
    "json": "{\"name\":\"Ada\",\"age\":37,\"email\":\"[email protected]\"}",
    "title": "Generated Schema",
    "description": "Schema generated from JSON data",
    "additionalProperties": false,
    "detectFormats": true,
    "requireAll": false,
    "includeExamples": true
}