JSON to Rust Struct Generator Online — Free Rust Serde Generator
JSON to Rust Struct
Convert JSON to Rust structs with serde Serialize/Deserialize derive macros.
Free online JSON to Rust struct generator. Paste any JSON object and get Rust struct definitions with #[derive(Debug, Serialize, Deserialize)] macros, serde rename_all attributes, Option<T> for nullable/optional fields, Vec<T> for arrays, and snake_case field naming. Perfect for Rust developers building REST API clients or data serialization code. Runs entirely in your browser.
Keywords: json to rust, json to rust struct, rust serde generator, rust struct from json, serde deserialize json, rust json types, rust struct generator, json rust converter, serde derive json, rust api struct, tokio rust json struct
Tags: json, rust, struct, serde, converter, generator
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How to JSON to Rust Struct Online
Paste valid JSON into the input area on the left.
Set the root struct name (defaults to 'Root') using the option field.
Toggle Serde derives (Serialize, Deserialize), Debug derive, and the serde rename_all convention.
Click Convert or press ⌘↵ (Mac) / Ctrl+Enter (Windows) to generate Rust structs.
Copy the generated Rust code or download it as a .rs file.
JSON to Rust Struct Features
Generates idiomatic Rust structs from any JSON object or array.
Supports nested objects — creates separate named structs for each nested structure.
Optional #[derive(Serialize, Deserialize)] for serde JSON support.
Optional #[derive(Debug)] for easy debug printing.
Optional #[serde(rename_all = "camelCase")] or snake_case renaming to map Rust field names to JSON keys.
Smart type inference: String, f64, bool, Vec<T>, Option<T>, and nested struct types.
Works entirely in your browser — JSON never leaves your device.
Keyboard shortcut ⌘↵ for instant conversion.
Frequently Asked Questions
- What is JSON to Rust struct conversion?
- JSON to Rust generates Rust struct definitions from a JSON sample, with optional serde attributes for serialization and deserialization. Instead of writing structs by hand, paste your API response and get strongly-typed Rust types ready for use with serde_json.
- What is serde?
- serde is Rust's de-facto serialization framework. With serde_json, structs annotated with #[derive(Serialize, Deserialize)] can be converted to and from JSON automatically. Add serde = { version = "1", features = ["derive"] } and serde_json to your Cargo.toml to use the generated code.
- What does rename_all do?
- The #[serde(rename_all = "...")] attribute tells serde to rename struct field names to a different case convention when serializing/deserializing. Use camelCase when your JSON keys are camelCase but your Rust fields are snake_case (the Rust convention).
- Is my JSON data safe?
- All conversion runs in your browser using pure JavaScript. No JSON is ever sent to a server. Your data stays completely private.
- Can it handle nullable fields?
- Yes. When a JSON field value is null, the generated Rust type is wrapped in Option<T> (e.g. Option<String>), correctly modelling the absence of a value.
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