JSON to TypeScript Interface

Paste JSON and get an exported TypeScript interface or type. Nested objects and arrays are inferred automatically. Free TS generator - instant, no signup.

Introduction

JSON to TypeScript Interface is a free, browser-based utility in our JSON Tools collection. Paste JSON and get an exported TypeScript interface or type. Nested objects and arrays are inferred automatically. JSON to TypeScript Interface helps you scaffold types from API responses. Infer string, number, boolean, arrays, and nested object shapes without leaving the browser. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include custom interface name.

Features

Custom interface name
Nested object inference
Array type detection
One-click copy

How to use

1
Paste sample JSON.
2
Set an interface name if you want.
3
Copy the generated TypeScript.

Example

Simple object

Input

{"id":1,"name":"Ada"}

Output

export interface Root {
 id: number;
 name: string;
}

Benefits

Run JSON to TS entirely in the browser with no signup or installation.
Keep sensitive sample data private — processing never leaves your device.
Custom interface name
Nested object inference
Array type detection
Pair it with JSON Formatter and JSON to CSV when your workflow needs adjacent utilities.

FAQs

No. Fields present in the sample are required in the generated interface.

Empty arrays become unknown[].

No. Generation is client-side.

Yes. JSON to TS on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.

No. JSON to TS runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.

Paste JSON and get an exported TypeScript interface or type. Nested objects and arrays are inferred automatically. It fits everyday json tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.

Core capabilities include: Custom interface name; Nested object inference; Array type detection; One-click copy.

Developers often pair JSON to TS with JSON Formatter, JSON to CSV, CSV to JSON. Open Related tools on this page for quick links.