Does json to typescript interface generator handle optional fields?

Null values in JSON become nullable union types where supported, helping you model optional API fields accurately.

Are union types created for mixed arrays?

Arrays infer element types from the first item. Mixed-type arrays may need manual refinement after generation.

No. Parsing and codegen execute locally in your browser session.

Front-end teams bootstrap API typings by pasting a real JSON response instead of hand-writing interfaces field by field.

Select TypeScript output to produce exportable interfaces with nested objects inferred from keys and array samples.

Works for React, Next.js, and Node projects—generation runs entirely in the browser so proprietary payloads stay private.

Responsive

in-content · Ad slot ready

Sample product JSON

{"sku":"A-12","price":19.99,"tags":["sale","new"]}

Generated interface shape

export interface Product {
  sku: string;
  price: number;
  tags: string[];
}

Does json to typescript interface generator handle optional fields?: Null values in JSON become nullable union types where supported, helping you model optional API fields accurately.
Are union types created for mixed arrays?: Arrays infer element types from the first item. Mixed-type arrays may need manual refinement after generation.
Is my API JSON stored on a server?: No. Parsing and codegen execute locally in your browser session.