Turn an API response into a TypeScript interface
Paste a JSON response body and generate interfaces for frontend models, fixtures, and API client typing.
Developer tools
JSON to Type
Paste JSON and generate TypeScript interfaces, Go structs, or Rust serde structs from the sample shape.
Output language
TypeScript output
Types generated
export interface ApiResponseOwner {
name: string;
email: string;
}
export interface ApiResponseStats {
date: string;
views: number;
indexed: boolean;
}
export interface ApiResponse {
id: number;
name: string;
active: boolean;
tags: string[];
owner: ApiResponseOwner;
stats: ApiResponseStats[];
}More developer tools
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About JSON type generation
JSON samples are often the fastest way to understand an API response. This tool infers object fields, arrays, null values, and primitive types, then turns the sample into language-specific type definitions.
Generation runs in your browser and is designed for quick API models, fixtures, documentation, and first-pass backend structs.
Common uses
- Create TypeScript interfaces from API responses
- Draft Go structs with json tags
- Generate Rust serde struct starting points
- Turn copied JSON examples into typed fixtures
Notes
Generated types are a starting point. Review optional fields, mixed arrays, number precision, naming conventions, and language idioms before using them in production code.
Examples
Create backend structs from sample JSON
Generate Go structs or Rust serde structs from a payload before wiring up a parser, handler, or test fixture.
FAQ
Does this tool upload my JSON?ShowHide
No. JSON parsing and type generation run in your browser, so pasted samples are not sent to the server.
Are generated types always production-ready?ShowHide
Treat generated output as a strong starting point. Review field names, optional values, numeric types, and mixed arrays before using it in production code.
What languages can it generate?ShowHide
The tool can generate TypeScript interfaces, Go structs with json tags, and Rust structs with serde rename attributes.
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