JSON to TypeScript Type Converter

How to use

1. Paste JSON input from your API payload or sample document.
2. Select your output target and model options.
3. Generate, review, and copy the result.

Benefits

• Handles nested objects and arrays from API responses.
• Reduces manual model writing and naming inconsistencies.
• Works instantly in browser with copy-ready output.

Best use cases

• Generate alias-based TypeScript output for teams that prefer type unions and aliases.
• Model JSON contracts without committing to interface declarations.
• Create lightweight static typings for shared payload samples and test fixtures.

Type mapping notes

• Objects map to nested type aliases.
• Primitive values map to standard TypeScript scalar types.
• Array values infer item aliases from representative sample elements.

Implementation tips

• Choose this route when alias-based typing fits your team conventions better than interfaces.
• Review unions and optional fields when payload shapes vary across environments.
• Use interface output instead when you want declaration merging and class-implements style ergonomics.

Sample JSON

{
  "id": 101,
  "name": "Ada Lovelace",
  "active": true,
  "roles": ["admin", "editor"],
  "profile": {
    "email": "ada@example.com",
    "score": 9.8
  }
}

Sample output

export type UserModel = {
  id: number;
  name: string;
  active: boolean;
  roles: string[];
  profile: Profile;
};

FAQ