MetoolzyJSON to TypeScript
Type Inference
Automatically infers TypeScript types from JSON values.
Nested Objects
Generates separate interfaces for nested objects.
Array Support
Handles arrays, arrays of objects, and mixed-type arrays.
Client-side
All processing in your browser. No data uploaded.
关于JSON to TypeScript
The JSON to TypeScript Converter instantly transforms any JSON object or array into strongly-typed TypeScript interfaces or type aliases. Rather than writing type definitions by hand — a tedious and error-prone process — this tool analyzes your JSON structure and infers the correct TypeScript types for every field automatically. When you work with REST APIs, GraphQL responses, or configuration files, you often receive raw JSON payloads. Manually maintaining type definitions that match evolving API schemas leads to drift and bugs. This converter bridges that gap: paste your JSON response, adjust options like the root interface name, optional properties, or whether to use `type` vs `interface`, and get production-ready TypeScript in seconds. The tool handles nested objects (generating separate named interfaces for each), arrays (including arrays of objects and mixed-type arrays), primitive types (string, number, boolean), and null values. All conversion runs entirely in your browser — your data never leaves your machine, making it safe for proprietary API schemas and internal data models. Whether you are bootstrapping a new TypeScript project or retrofitting types onto an existing codebase, this tool dramatically reduces boilerplate and helps you ship type-safe code faster.
如何使用JSON to TypeScript
- Paste your JSON object or array into the left input panel, or click "Load Sample" to try an example.
- Set your preferred root interface name in the "Root name" field (default is "Root").
- Toggle options as needed: use "type" instead of "interface", mark all properties as optional, or add the "export" keyword.
- The TypeScript output updates in real time in the right panel as you type or change options.
- Review the generated interfaces — nested objects produce additional named interfaces above the root.
- Click "Copy" to copy the output to your clipboard and paste it directly into your TypeScript file.
常见问题
What TypeScript types does this tool generate?
The converter infers string, number, boolean, null, arrays (including typed arrays like string[] or object arrays), and nested object interfaces. Unknown types fall back to the "unknown" TypeScript type.
Can I convert a JSON array instead of a single object?
Yes. If you paste a JSON array whose first element is an object, the tool generates an interface for that element shape. If the array contains primitives, it generates a simple type alias like "type Root = string[]".
What is the difference between "interface" and "type" output?
Both are valid TypeScript. Interfaces are generally preferred for object shapes and support declaration merging. Type aliases (using the "type" keyword) are more flexible and can represent unions and other complex types. Toggle the checkbox to choose your preferred style.
Does this handle keys with special characters or spaces?
Yes. Property keys that are not valid JavaScript identifiers are automatically wrapped in double quotes in the output (e.g., "my-key": string).
Is my data sent to a server?
No. All processing happens entirely in your browser using JavaScript. No data is uploaded or stored anywhere.
What should I do if a JSON property has different types in different objects?
The tool infers types from the first item it encounters. For mixed arrays, it creates a union type like (string | number)[]. For more precise control over optional or union fields, you can edit the generated output manually after copying.
JSON to TypeScript 完全使用指南与免费在线工具
无需安装、完全免费、纯前端本地运行的高效 JSON to TypeScript 工具
用于快速解决：将JSON转换为TypeScript接口和类型。。无需安装复杂软件，打开网页即可立即使用，极速且安全。
为什么选择 Metoolzy 的 JSON to TypeScript？
- 秒级即时响应: 极致性能优化，输入即可见结果。
- 数据绝对安全: 纯浏览器本地计算，数据绝不上传服务器。
- 完全免费使用: 无需注册登录，无任何隐形消费。
三步快速上手
- 打开 Metoolzy JSON to TypeScript 工具页面。
- 在输入区粘贴或上传您的数据。
- 即时查看处理结果并点击复制或下载。
功能对比表
| 对比项 | Metoolzy JSON to TypeScript | 普通在线工具 | 本地客户端软件 |
|---|---|---|---|
| 使用成本 | 永久免费 | 有次数限制或收费 | 需购买授权 |
| 隐私保护 | 纯本地内存运行 | 数据需上传云端 | 本地运行 |
适用人群与应用场景
- 软件开发人员日常调试与数据转换
- UI/UX 设计师资产处理
- 运营与办公人员效率提升
常见问题解答 (FAQ)
处理的数据会被记录或保存吗？
绝不会。所有运算均在您的浏览器本地完成，没有任何数据回传。