如何Convert JSON 到 TypeScript Types

问题

你有 JSON API responses 和 want TypeScript types 到 get compile-时间安全性和 autocomplete.

前置条件

• Understanding 的 JSON
• Understanding 的 TypeScript types 和 interfaces

步骤

1. 1. Analyze the JSON structure

   The converter inspects the JSON to determine field types. Strings become string, numbers become number, booleans become boolean, null becomes null, arrays become T[], and objects become nested interfaces. Field names become property names.

   输入

   {"name":"Alice","age":30}

   输出

   types: name→string, age→number

2. 2. Generate TypeScript interfaces

   Produce interface declarations with typed properties. Nested objects become separate interfaces. Union types are generated for fields that can be multiple types. Optional properties (undefined) are marked with ?.

   输入

   JSON object

   输出

   interface MyData { name: string; age: number; }

3. 3. Refine the generated types

   Review the output and refine: use more specific types (string literals for enums, Date for date strings), rename interfaces for clarity, and add JSDoc comments. Consider making some fields optional if they are not always present in the API response.

   输入

   raw interface

   输出

   refined, documented types

预期结果

TypeScript interfaces 该 accurately 描述 JSON 结构为 类型-安全 development.

常见错误

All fields marked as required

If some fields are optional in the API, mark them with ? in the interface. A single sample cannot determine optionality.

Date strings typed as string

JSON has no Date type. Manually change date string fields to Date or use a branded type for runtime parsing.

排障指引

• If the types are too loose, add string literal types for enum-like fields.
• For arrays of mixed types, use union types or discriminated unions.

安全限制

• Type generation is a static analysis. No data is transmitted or executed.