Code Utilities utility
TypeScript Interface Generator
Infer TypeScript interfaces and nested object types from a JSON sample.
● This tool runs entirely in your browser. Your input is never uploaded to our servers.
Output
Your result will appear here…
How to use TypeScript Interface Generator
- Paste a representative JSON object.
- Select Generate Code to infer interfaces from its values.
- Review types against your full API schema, especially optional and mixed-array fields.
Example
Input:
{"id":1,"name":"Ada","active":true,"profile":{"city":"London"}}Output:
export interface Profile {
city: string;
}
export interface Root {
id: number;
name: string;
active: boolean;
profile: Profile;
}Use cases
- Create a starting interface for an API response.
- Document JSON fixtures with TypeScript types.
- Inspect nested object properties quickly.
About this tool
Infer TypeScript interfaces and nested object types from a JSON sample. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.
Frequently asked questions
Are types inferred from the entire API schema?
No. Types are inferred from the one JSON sample you provide.
Are absent or optional properties detected?
No. Every property in the sample is emitted as required; use representative samples and review the result.
Does the JSON leave my browser?
No. Type generation runs locally.