JSON to Code
Convert JSON objects to idiomatic structs and classes in Go, Rust, Python, Java, Kotlin, C#, and Swift. Handles nested objects, arrays, nullable fields, and language-specific idioms. Runs entirely in your browser.
Generate idiomatic type definitions from JSON data across all major backend languages. Paste any JSON object or array and instantly get properly typed structs, classes, or dataclasses — with language-specific conventions like Go's JSON struct tags, Rust's serde derive macros, Python dataclasses or Pydantic models, and Swift's Codable conformance.
Supported Languages: Go, Rust, Python (dataclass + Pydantic), Java (Jackson), Kotlin (kotlinx.serialization), C# (System.Text.Json), Swift (Codable). All nested objects are recursively typed — no manual work needed.
How It Works: The converter analyzes the JSON structure, infers types for each field, and generates idiomatic code following the conventions of each language. Nested objects become separate type definitions. Arrays of objects generate typed collections. Null values become optional/nullable types.
Best Practices: For best results, use a representative JSON sample that includes all fields you expect, including optional ones with non-null values. Review generated types and adjust as needed — especially for union types or polymorphic fields that can't be inferred from a single sample.