JSON to TypeScript API

Generate TypeScript interfaces or type aliases from a sample JSON document. Keys missing from some array items become optional.

POST /api/v1/tools/json-to-typescriptMCP json_to_typescriptDeveloper Tools

Generate TypeScript interfaces or type aliases from JSON, with named nested types, merged array shapes, optional keys and null unions. Runs in your browser.

Input

Send these as a JSON object. Unknown fields are rejected.

input: A sample JSON document (object or array). (string, required)
rootName: Name of the top-level type. (string, up to 100 characters, default "Root")
style: interface emits `interface X {}`; type emits `type X = {}`. (string, one of interface, type, default "interface")
exportKeyword: Prefix each declaration with export. (boolean, default true)

Try it in the browser JSON Schema Get an API key

curl https://pithlab.com/api/v1/tools/json-to-typescript \n  -H "Authorization: Bearer $PITHLAB_KEY" \n  -H "Content-Type: application/json" \n  -d '{"input":"{\"id\":1,\"title\":\"Hello\",\"author\":{\"name\":\"Ada\"},\"tags\":[\"intro\"]}","rootName":"Post"}'

Example response

{
  "ok": true,
  "result": {
    "output": "interface Post {\n  id: number;\n  title: string;\n  author: Author;\n  tags: string[];\n}\n\ninterface Author {\n  name: string;\n}\n"
  }
}