JSON Schema Generator Online

Enter JSON to generate schema

Input JSON

Characters: 0Size: 0 KB

Generated Schema

Characters: 0Size: 0 KB

JSON Schema Syntax Guide

Core Keywords:

type - Data type (string, number, object, array, boolean, null)
properties - Defines object properties
items - Defines array item schemas
required - List of required properties
additionalProperties - Controls extra properties

String Validation:

minLength / maxLength - Length constraints
pattern - Regular expression pattern
format - Predefined formats (date, email, uri, etc.)

Number Validation:

minimum / maximum - Value range
exclusiveMinimum / exclusiveMaximum - Exclusive bounds
multipleOf - Divisor constraint

Advanced Features:

$ref - Reference other schemas
allOf / anyOf / oneOf - Schema composition
not - Negation constraint
if / then / else - Conditional validation

Current Draft: draft-07

Learn more at: json-schema.org

Schema generation features:

This tool provides solutions for working with json schema generator data.

Multiple Drafts

Support for draft-07, 2019-09 and 2020-12

Smart Inference

Detect patterns, formats and constraints

Customization

Adjust strictness and requirements

OpenAPI Integration

Export as OpenAPI Schema components

Input:

{
  "id": "user-123",
  "name": "John Doe",
  "email": "john@example.com",
  "active": true,
  "roles": ["admin", "user"]
}

Output:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "required": ["id", "name", "email", "active", "roles"],
  "properties": {
    "id": {"type": "string", "pattern": "^user-\d+$"},
    "name": {"type": "string", "minLength": 1},
    "email": {"type": "string", "format": "email"},
    "active": {"type": "boolean"},
    "roles": {
      "type": "array",
      "items": {"type": "string", "enum": ["admin", "user"]}
    }
  }
}

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