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JSON Schema to TypeScript Interface Generator

Complete guide with examples and best practices

Developer Tool
Type Safety
API Development
What is JSON Schema to TypeScript Conversion?

JSON Schema to TypeScript conversion transforms JSON Schema definitions into strongly-typed TypeScript interfaces. This process enables type safety in your applications by generating TypeScript types that match your API contracts, database schemas, or configuration files.

Key Benefits:

  • Automatic type generation from existing schemas
  • Ensures consistency between API contracts and frontend code
  • Reduces manual typing errors and improves developer experience
  • Enables better IDE support with autocomplete and error detection
1Prepare Your JSON Schema

Start with a valid JSON Schema that follows the Draft 07 specification or later. Your schema should define the structure, types, and constraints of your data.

Example JSON Schema:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "title": "User",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique user identifier"
    },
    "name": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100
    },
    "email": {
      "type": "string",
      "format": "email"
    },
    "age": {
      "type": "integer",
      "minimum": 0,
      "maximum": 150
    },
    "isActive": {
      "type": "boolean",
      "default": true
    },
    "roles": {
      "type": "array",
      "items": {
        "type": "string",
        "enum": ["admin", "user", "moderator"]
      }
    },
    "profile": {
      "type": "object",
      "properties": {
        "bio": {
          "type": "string"
        },
        "avatar": {
          "type": "string",
          "format": "uri"
        }
      }
    }
  },
  "required": ["id", "name", "email"]
}

💡 Pro Tips:

  • Include meaningful descriptions for better generated comments
  • Use proper JSON Schema keywords like "required", "enum", "format"
  • Validate your schema using online JSON Schema validators
  • Consider using $ref for reusable schema components
2Enter Interface Name

Provide a descriptive name for your TypeScript interface. Follow TypeScript naming conventions using PascalCase (e.g., "UserProfile", "ApiResponse", "DatabaseRecord").

✅ Good Examples:

  • User
  • ProductDetails
  • ApiResponse
  • UserPreferences

❌ Avoid:

  • user (lowercase)
  • User_Data (snake_case)
  • userData (camelCase)
  • IUser (Hungarian notation)
3Paste Your JSON Schema

Copy your JSON Schema definition and paste it into the input field. The tool will validate the schema and show any syntax errors.

Common Schema Features Supported:

Basic Types:
  • string → string
  • number/integer → number
  • boolean → boolean
  • array → Type[]
  • object → interface
Advanced Features:
  • enum → union types
  • required → non-optional properties
  • descriptions → JSDoc comments
  • nested objects → inline types
4Generate and Use Your Interface

Click "Generate Interface" to convert your schema. The generated TypeScript interface will appear in the output area with proper typing and optional JSDoc comments.

Generated Interface Example:

interface User {
  /**
   * Unique user identifier
   */
  id: string;
  name: string;
  email: string;
  age?: number;
  isActive?: boolean;
  roles?: ("admin" | "user" | "moderator")[];
  profile?: {
    bio?: string;
    avatar?: string;
  };
}
Real-World Use Cases

API Development

Generate TypeScript interfaces from OpenAPI/Swagger schemas to ensure type safety between your API contracts and frontend applications.

Database Modeling

Convert database schema definitions into TypeScript types for ORM configurations and data validation layers.

Configuration Files

Generate types for configuration files, environment variables, and settings to catch configuration errors at compile time.

Form Validation

Create TypeScript interfaces for form schemas used with libraries like React Hook Form, Formik, or Zod for consistent validation.

Best Practices & Tips

Use Descriptive Property Names

Choose clear, self-documenting property names that make the generated interface easy to understand.

Include Validation Constraints

Add minLength, maxLength, minimum, maximum, and pattern constraints to generate more precise types.

Leverage Enums for Fixed Values

Use enum properties to generate union types that restrict values to specific options.

Test Generated Interfaces

Always test your generated interfaces with real data to ensure they work as expected in your application.

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