JSON to JavaScript Object Converter
Code declaration will appear here...About JSON to TypeScript
The JSON to TypeScript Interface Generator converts raw JSON payloads and API responses into strictly-typed TypeScript interfaces, type aliases, and optional Zod schemas with automatic nested object inference and JSDoc annotations.
How to Use JSON to TypeScript
Step 1
Paste your JSON payload into the left editor pane.
Step 2
Customize the Root Interface Name (e.g. UserData).
Step 3
Select Interface or Type output mode.
Step 4
Copy the generated TypeScript definitions.
Practical Use Cases for JSON to TypeScript
Frontend API Type Safety
Generate TypeScript interface contracts for REST and GraphQL API responses in React, Next.js, and Vue applications.
Backend DTO Modeling
Create strongly typed Data Transfer Objects (DTOs) and models for NestJS, Express, and Node.js microservices.
Input & Output Examples
Generating TypeScript Interface from User JSON
{"id": 101, "name": "Sarah", "roles": ["admin", "editor"], "active": true}export interface UserResponse {\n id: number;\n name: string;\n roles: string[];\n active: boolean;\n}Key Features & Performance
- ✓Infers primitive types, nested object hierarchies, and union array types.
- ✓Supports Interface (export interface) and Type Alias (export type) syntax.
- ✓Generates optional Zod schema validation models.
- ✓100% Client-Side memory execution guarantees total API data privacy.
- ✓1-Click Copy TypeScript code.
Key Terminology & Definitions
TypeScript Interface
A syntactical contract in TypeScript that defines the shape, property names, and value types of an object.
Type Inference
The automatic deduction of data types from example values without explicit developer type declarations.