Does it create interfaces or types?

Objects become interfaces; array roots and primitives use type aliases.

JSON to TypeScript

New

Generate TypeScript interfaces from JSON. Nested objects become separate interfaces.

Best-effort from sample JSON

Root type name

JSON

TypeScript model

{"name":"DevKit","free":true}

export interface Root {
  name: string;
  free: boolean;
}

Beautify and minify JSON instantly

Validate JSON syntax with detailed errors

Convert between JSON and YAML

Convert between JSON and XML