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JSON to TypeScript Interface Generator
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TypeScript Generator

Generate TypeScript interface definitions from your JSON schema automatically.
Last updated: July 7, 2026•100% Client-Side & Private
INPUTJSON

INPUT

Paste or type your data here, or click "Load Sample" to try an example.

orOpen Fileor Drag & Drop
OUTPUTTYPESCRIPT

Ready: TypeScript Generator

Generate TypeScript interface definitions from your JSON schema automatically.

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About this Tool

Generate instant TypeScript interfaces from JSON payloads.

1Why Generate Types from JSON?

Generating TypeScript interfaces directly from JSON API payloads is an essential practice for building strongly-typed web applications. This tool takes any valid JSON object or array, infers its types, and creates structured TypeScript declarations that can be dropped straight into your codebase. By converting raw payloads into formal interfaces, developers prevent runtime exceptions caused by missing or mismatching parameters. The generator handles deeply nested object hierarchies, optional fields, and array structures, mapping them recursively to prevent duplicate interface declarations. Because this process runs completely offline in your browser, your proprietary schemas and endpoint payloads remain 100% private. This tool is a major time-saver for frontend developers consuming external REST or GraphQL APIs. For more details, explore our blog articles: Why Offline-First Developer Tools Matter and The Hidden Risks of Online Developer Tools.

2Example: JSON to TypeScript Interface

Input JSON:
{ "id": 1, "profile": { "username": "dev_user", "isActive": true } }
Output TypeScript:
interface Profile { username: string; isActive: boolean; } interface RootObject { id: number; profile: Profile; }

3Deep Type Inference

Our generator doesn't just do top-level properties. It recursively explores nested objects and arrays, creating child interfaces where necessary to keep your code DRY and maintainable. It also handles null values and optional properties by checking for inconsistencies across array items.

4Privacy Guaranteed: Local AST Generation

Pasting sensitive API schemas or internal data models here is entirely safe. The Abstract Syntax Tree (AST) generation and code emission run exclusively offline in your browser. No data is ever sent to a remote server for analysis or improvement.

Privacy Guarantee

The JSON to TypeScript Interface Generator operates 100% locally in your web browser. Your JSON objects, arrays, and keys are processed entirely in-memory using Web Workers and JavaScript. No JSON data is ever transmitted across the network or stored on external servers, making it completely safe for sensitive enterprise payloads.