JSON to TypeScript

Input Area

Paste or upload your JSON data here. Real-time conversion happens automatically as you type.

• Upload .json files with the Upload button
• Load sample data (Basic, Complex, Array)
• Clear all data with the Clear button
• Real-time syntax validation
• 300ms debounce for smooth typing

Output Area

View your generated TypeScript interface with statistics and actions.

• Toggle preview visibility
• Copy to clipboard with one click
• Download as .ts file
• Download all formats (.ts, .d.ts, .json)
• Statistics: lines, properties, interfaces count

Interface Name

Define the name for your generated TypeScript interface. Default is "MyInterface".

• Supports any valid TypeScript identifier
• Automatically converted to PascalCase
• Used for filename in downloads

Naming Convention

Choose how property names are formatted in the output:

• camelCase (default, e.g., firstName)
• PascalCase (e.g., FirstName)
• snake_case (e.g., first_name)

Indent Size

Choose your preferred indentation style:

• 2 spaces (default, most common)
• 4 spaces (readable, ESLint standard)
• 8 spaces (wide, for complex types)

Array Style

Choose how array types are represented:

• Bracket notation (e.g., string[])
• Generic notation (e.g., Array<string>)

Optional Properties

Make all properties optional by adding the "?" modifier.

• Useful for partial data responses
• Properties become: name?: string
• Good for flexible API responses

Export Keyword

Add the "export" keyword to the generated interface.

• export interface MyInterface
• Useful for module imports
• Toggle for internal/private types

Readonly Properties

Add the "readonly" modifier to all properties.

• Properties become: readonly name: string
• Prevents accidental mutations
• Good for immutable data patterns

Strict Null Checks

Handle null and undefined values strictly.

• null values become "null" type
• undefined values become "undefined" type
• When off, defaults to "any" type

Type Alias

Generate using "type" instead of "interface".

• type MyInterface = {...}
• Better for union/intersection types
• Interface for object-specific types

Add Comments

Generate JSDoc comments for nested objects.

• Adds documentation headers
• Comments for nested objects
• Improves IDE intellisense

Sort Properties

Sort properties alphabetically in the output.

• Alphabetical ordering
• Consistent output for diffs
• Better code organization

Generate Enums

Create enums for common string values.

• Detects: active, inactive, pending
• Creates Status enum
• Reduces string literal types

Conversion History

Stores up to 10 recent conversions with timestamps.

• Click any entry to reload it
• Shows interface name and timestamp
• Preview of input and output
• Auto-removes duplicates

Quick Actions

Each history entry has quick action buttons:

• Copy to clipboard
• Download as .ts file
• Clear all history
• Visual indicator for selected item

API Integration

Convert API response JSON into TypeScript interfaces for type-safe data handling in your frontend applications.

Database Schemas

Generate TypeScript types from database query results or ORM entities for end-to-end type safety.

Configuration Files

Create type definitions for configuration JSON to catch errors early during development.

Frontend Development

Quickly generate props types and state interfaces from mock data or design specifications.

TypeScript Migration

Jumpstart TypeScript adoption by converting existing JSON configurations into typed interfaces.

Documentation

Generate type documentation from example data structures for API docs and code examples.