JSON to TypeScript Converter

Q: Does the converter handle nested JSON objects?

Yes. The converter handles deeply nested JSON objects and generates separate TypeScript interfaces for each nested object, linked by type references.

Q: Can I convert JSON arrays to TypeScript?

Yes. JSON arrays are converted to typed TypeScript arrays (e.g., string[], number[], or interface[]) based on the array element types.

Convert JSON objects and API responses to TypeScript interfaces with AI — free, instant, no login required.

JSON to TypeScript conversion generates typed interface definitions from your JSON data — eliminating the need to write boilerplate interfaces manually. Paste any JSON object or API response and get production-ready TypeScript interfaces in seconds.

Paste your code, then click Convert

Typescript

How to use this tool?

This online converter harnesses AI to seamlessly convert your JSON code to TypeScript in just a click of a button. Follow these steps to make the most of this advanced converter:

Type or paste your JSON code into the input box provided. You can directly enter your code or copy it from your favourite code editor.
Initiate the conversion process by clicking on the "Convert" button
Instantly view the transformed TypeScript code in the output box. The AI-powered converter ensures accurate and efficient conversion.

Example: Simple Function

JSON

// JSON
{
  "name": "John",
  "age": 30,
  "car": null
}

TypeScript

// TYPESCRIPT INTERFACE
export interface Root {
  name: string;
  age: number;
  car: null;
}

How to Generate TypeScript Interfaces from JSON

Manually writing TypeScript interfaces for API responses means copying every field, guessing types, and repeating boilerplate for each endpoint. For a response with 20 nested fields, that can take 30+ minutes and is error-prone.

The JSON to TypeScript converter automates this entirely. Paste any JSON object or API response and get production-ready TypeScript interfaces with correct types, optional fields, and nested interface declarations — in seconds.

Why Use a JSON to TypeScript Converter?

→Catch type mismatches between code and API responses at compile time, before they reach production
→Get full IDE autocomplete on every API response field automatically
→Eliminate runtime errors from unexpected null or undefined values in API data
→Self-document your codebase — typed interfaces explain data shapes to every developer

What the JSON to TypeScript Converter Handles

Primitive types (string, number, boolean)

Nested object interfaces

Array and tuple types

Optional and nullable fields

Union types from mixed arrays

Deeply nested structures

null / undefined handling

String literal types

Interface naming from JSON keys

API response objects

Config file structures

GraphQL response shapes

From JSON to TypeScript Interface — How It Works

A JSON to TypeScript interface converter reads the structure and value types of a JSON object and outputs a matching TypeScript interface. For example, a JSON field with value "Alice" becomes name: string. A nested object becomes a separate interface. An array of objects becomes items: Item[]. The converter handles all of this automatically — paste your JSON API response and get a typed TypeScript interface in one click.

JSON → Zod Schema

Runtime validation from JSON

JSON → JSON Schema

OpenAPI-compatible schema

TypeScript → JSON

Generate mock JSON from TS types

Frequently Asked Questions

What is JSON to TypeScript conversion?

JSON to TypeScript conversion generates TypeScript interface definitions from JSON data. Instead of manually writing interfaces that mirror your API responses or config files, the converter infers string, number, boolean, array, and nested object types automatically.

Does the converter handle nested JSON objects?

Yes. Deeply nested JSON objects are converted to multiple linked TypeScript interfaces, with each nested object getting its own interface definition.

Can I convert JSON arrays to TypeScript?

Yes. JSON arrays are converted to typed TypeScript arrays such as string[], number[], or YourInterface[] based on the inferred element types.

Is this tool free?

Yes, completely free with no account required.

Does JS2TS store my JSON data?

No. Your data is processed in real time and never stored or logged on our servers.

How do I convert a JSON API response to TypeScript?

Paste the JSON API response directly into the converter. It generates TypeScript interfaces matching the response structure, including nested objects and arrays. You can then import and use the interface to type your fetch() or axios calls.

Does the converter handle JSON arrays?

Yes. JSON arrays generate typed TypeScript arrays — string[], number[], or YourInterface[] depending on element types. Mixed arrays produce union type arrays.

What is the difference between JSON to TypeScript and JSON to Zod?

JSON to TypeScript generates compile-time type interfaces — useful for IDE support and type checking. JSON to Zod generates runtime validation schemas — useful for validating API responses at runtime. Use both together: TypeScript interfaces for coding, Zod schemas for validation.

Can I convert nested JSON to TypeScript?

Yes. Deeply nested JSON objects are converted to multiple linked TypeScript interfaces. Each nested object gets its own interface, and the parent interface references it by type.

Does JS2TS handle JSON with null values?

Yes. Fields with null values are typed as string | null, number | null, etc. Fields that appear in some objects but not others become optional (fieldName?: Type).