Free Code Generation Tools
Generate typed code from JSON in TypeScript, Go, Python, C#, Java, and Rust. Convert cURL commands to working code in multiple languages. Every tool is free, requires no signup, and runs 100% client-side.
Why Use Code Generation Tools?
Writing type definitions, data classes, and struct declarations from JSON API responses is one of the most repetitive tasks in software development. It is tedious, error-prone, and slows down your development cycle. These code generation tools automate the process by analyzing JSON structure and producing correctly typed code in your target language, saving minutes per model and hours per project.
JSON to TypeScript Interfaces
The JSON to TypeScript converter generates TypeScript interfaces from JSON data. It correctly identifies string, number, boolean, null, array, and object types, creates separate interfaces for nested objects, and handles arrays of mixed types as union types. The output follows TypeScript naming conventions and can be configured for interface vs. type alias output.
JSON to Go Structs
The JSON to Go Struct generator produces idiomatic Go struct definitions with PascalCase field names, json struct tags for marshaling, and proper Go types. Nested objects become separate named structs. Nullable fields use pointer types. The output is ready to paste into your Go project and compile without modifications.
JSON to Python Dataclasses
The JSON to Python Dataclass tool generates Python dataclasses with full type hints compatible with Python 3.7+. It supports both standard dataclasses and Pydantic models, handles Optional fields, List types with element typing, and nested dataclass generation. The output works with mypy and other static type checkers.
JSON to C# and Java Classes
For .NET developers, JSON to C# Classes generates C# class definitions with proper casing conventions, JsonProperty attributes, and nullable reference types. For Java developers, JSON to Java Classes creates POJO classes with Lombok annotations support, getters/setters, and Jackson annotations for JSON serialization.
JSON to Rust Structs
The JSON to Rust Structs converter generates Rust struct definitions with serde derive macros for serialization and deserialization. It uses idiomatic Rust types (String, i64, f64, bool, Vec, Option), applies snake_case field naming with serde rename attributes, and creates separate structs for nested objects.
cURL to Code Conversion
The cURL to Code Converter parses cURL commands (the kind you copy from browser DevTools or API documentation) and generates equivalent code in Python (requests), JavaScript (fetch), Go (net/http), and other languages. It handles all common cURL flags including headers, POST data, authentication, and query parameters.
Privacy and Speed
All code generation runs entirely in your browser using JavaScript. Your JSON data and API structures are never sent to any server. This makes the tools safe for proprietary API schemas, internal data models, and sensitive configuration structures. Processing is instantaneous regardless of input size, limited only by your browser's JavaScript engine.
Frequently Asked Questions
How does JSON to TypeScript conversion work?
The tool analyzes the structure and data types of your JSON, then generates TypeScript interfaces with correctly typed properties. It handles nested objects, arrays, null values, optional fields, and union types. You can configure the output to use interfaces or types, and choose between strict and relaxed typing modes.
Can I convert JSON to Go structs?
Yes. The JSON to Go converter generates Go struct definitions with proper field names (PascalCase), json struct tags, and idiomatic Go types. It handles nested objects as separate struct types, arrays, nullable fields with pointer types, and generates omitempty tags where appropriate.
What Python output formats are supported?
The JSON to Python tool generates Python dataclasses with type hints. It supports standard library dataclasses and Pydantic models, handles nested objects, lists with typed elements, optional fields with Optional type hints, and generates proper __init__ methods. The output is compatible with Python 3.7 and later.
How does the cURL to code converter work?
Paste a cURL command and the tool parses the URL, HTTP method, headers, query parameters, and request body. It then generates equivalent code in multiple languages including Python (requests), JavaScript (fetch), Node.js (axios), Go (net/http), and more. This saves time when translating API documentation examples into your preferred language.
Are the generated types production-ready?
The generated code is a strong starting point and handles most common patterns correctly. For production use, you should review the output for edge cases specific to your data - for example, fields that are sometimes numbers and sometimes strings may need union types or custom parsing. The tools analyze the JSON you provide, so supplying a representative sample with all possible fields produces the best results.