📘JSON to TypeScript

Generate TypeScript interfaces from JSON data.

Share:

Root Interface Name

JSON Input

TypeScript Output

interface Root {
  id: number;
  name: string;
  email: string;
  isActive: boolean;
  address: RootAddress;
  tags: string[];
  metadata?: null;
  scores: number[];
}

interface RootAddress {
  street: string;
  city: string;
  zip: string;
}

About JSON to TypeScript

Automatically generate TypeScript interfaces and type definitions from any JSON object or array. Paste raw JSON from an API response or data file and get a ready-to-use TypeScript interface in seconds. Handles nested objects, arrays, optional fields, and complex structures without manual typing.

How to Use JSON to TypeScript

1
Paste your JSON
Enter or paste your JSON data into the input field.
2
Generate interfaces
Click generate to produce TypeScript interface definitions from your JSON structure.
3
Copy the TypeScript
Copy the generated interfaces and paste them directly into your TypeScript project.

Common Use Cases

Typing API responses without writing interfaces by hand
Generating type definitions for third-party data sources
Speeding up TypeScript project setup with real data shapes
Creating types for JSON config files and schemas

Frequently Asked Questions

Can it handle nested JSON objects?

Yes, the generator creates nested TypeScript interfaces for deeply nested JSON objects, giving each nested object its own named interface.

Does it detect optional fields?

The tool analyzes the JSON structure and can mark fields that are missing in some objects as optional using the ? modifier.

Related Articles

Understanding JSON: The Complete Beginner's Guide

9 min read

Related Tools

JSON Formatter

Format, validate, and beautify JSON data with syntax highlighting.

TypeScript to JSON Schema

Convert TypeScript interfaces to JSON Schema definitions.

CSV to JSON

Convert CSV data to JSON format and vice versa.

Unit Converter

Convert between units of length, weight, temperature, volume, and more.

Color Converter

Convert between HEX, RGB, and HSL color formats with a live preview.

Number Base Converter

Convert numbers between binary, decimal, hexadecimal, and octal bases.