JSON to Code Generator
Convert your JSON data into strongly-typed code structures. Generate TypeScript interfaces, Go structs with json tags, Java classes, and Python dataclasses or dicts instantly.
Type Mapping Reference
JSON to TypeScript
| JSON Type | TypeScript Type |
|---|---|
| string | string |
| number (integer) | number |
| number (float) | number |
| boolean | boolean |
| null | null |
| object | interface ｛...｝ |
| array | Type[] |
JSON to Go
| JSON Type | Go Type |
|---|---|
| string | string |
| number (integer) | int64 |
| number (float) | float64 |
| boolean | bool |
| null | any |
| object | struct ｛...｝ |
| array | []Type |
JSON to Java
| JSON Type | Java Type |
|---|---|
| string | String |
| number (integer) | Long |
| number (float) | Double |
| boolean | Boolean |
| null | Object |
| object | Class ｛...｝ |
| array | List<Type> |
JSON to Python
| JSON Type | Python Type |
|---|---|
| string | str |
| number (integer) | int |
| number (float) | float |
| boolean | bool |
| null | None |
| object | dataclass / dict |
| array | list[Type] |
About JSON to Code Generator
The JSON to Code Generator converts your JSON data into strongly-typed code structures for multiple programming languages. This is particularly useful when you receive JSON from an API and want to work with it using proper types instead of raw dictionaries or maps.
For TypeScript, it generates interfaces that provide type safety and IDE autocomplete support. For Go, it creates structs with proper json tags for serialization. For Java, it produces complete classes with fields, getters, and setters. For Python, it generates either dataclasses with type hints or simple dict structures.
The tool automatically infers types from JSON values, handles nested objects by creating separate types, and manages arrays by determining the element type. Simply paste your JSON, select your target language, and get production-ready code instantly.
Related JSON Tools
Features
Multiple Languages
Generate code for TypeScript, Go, Java, and Python with idiomatic conventions and proper type mappings for each language.
Nested Type Support
Automatically handles deeply nested JSON by generating separate interfaces, structs, or classes for each nested object level.
Instant Conversion
Auto-convert mode updates the generated code as you type, with real-time type inference and structure analysis.
Language-Specific Tags
Go structs include json tags, Java classes include proper naming conventions, and Python uses type hints throughout.
Customization Options
Configure export keywords, optional properties, getters/setters, dataclass mode, and custom root class names.
Copy & Download
Quickly copy generated code to clipboard or download as a properly named file (.ts, .go, .java, .py) for immediate use.
How to Use
Paste JSON Data
Enter your JSON in the left panel or click "Load Sample" to try with sample user data. The JSON can include nested objects and arrays.
Select Target Language
Choose TypeScript, Go, Java, or Python. Configure options like export keywords, json tags, or getters/setters as needed.
Customize Root Name
Set a custom name for the root type. The tool will automatically name nested types based on their parent key (e.g., User, Address).
Copy or Download
Review the generated code in the right panel. Use the Copy button to copy to clipboard or Download to save as a file.