Paste a JSON response and get clean TypeScript interfaces: nested objects become their own named interfaces, and object arrays merge into a single interface where keys missing from some items are marked optional.
Nulls map to null, empty arrays to unknown[], and mixed-type arrays become a union — matching what a real API returns rather than what a schema wishes it returned.
Frequently asked questions
Why are some fields optional?
A key that appears in some array items but not all is marked with ?. This is inference from evidence: the sample shows the key can be absent.
What about JSON Schema or OpenAPI?
Those describe intent; this tool describes the data you actually have. For API contracts, prefer generating from the schema; for poking at a live response, this is faster.
中文说明
粘贴一段 JSON 响应，即可得到干净的 TypeScript 接口定义：嵌套对象生成独立命名的 interface，对象数组自动合并为单一接口，部分元素缺失的键会标注为可选字段。
null 映射为 null、空数组映射为 unknown[]、混合类型数组生成联合类型——忠实反映 API 的真实返回，而不是 schema 的美好愿望。
常见问题
为什么有些字段是可选的？
数组中部分元素有、部分没有的键会标注 ?。这是基于证据的推断：样本证明了这个键可能缺失。
和 JSON Schema / OpenAPI 生成有什么区别？
Schema 描述"意图"，本工具描述"实际拿到的数据"。定义 API 契约请用 schema 生成；临时看一个线上响应，这里更快。