About this Tool
Generate instant TypeScript interfaces from JSON payloads.
1Why Generate Types?
Manually writing TypeScript interfaces for massive nested JSON API responses is tedious and prone to error. This generator automatically scans all properties, infers their primitive types (string, number, boolean), and constructs a strict TypeScript definition tree.
2Example: JSON to TypeScript Interface
Input JSON: ```json { "id": 1, "profile": { "username": "dev_user", "isActive": true } } ``` Output TypeScript: ```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
Secure Devutils operates exclusively in your browser using local web workers and JavaScript. Your source code, configurations, and sensitive text payloads are never transmitted across the network or stored on any external servers. It is completely safe for air-gapped environments.