JSON to Rust

Convert JSON to Rust structs online. Serde-ready structs with #[derive(Serialize, Deserialize)], Option<T> for nullable fields, and automatic camelCase renaming.

Generated code will appear here...

Everything runs locally in your browser. Your JSON is never uploaded or stored.

What is a JSON to Rust converter?

A JSON to Rust converter turns a raw JSON sample into serde-annotated Rust structs. Paste an API payload and get types you can drop straight into a Rust project next to serde_json. Everything runs in your browser.

How to generate Rust structs from JSON

Paste your JSON and the structs appear live. Press Copy and add them to your project — pair the output with serde and serde_json derives already included in the code.

Type mapping

Whole numbers map to i64, fractional numbers to f64, arrays to Vec<T>, and objects with non-identifier keys to HashMap<String, T>. Values of unknown or mixed shape become serde_json::Value so nothing breaks at runtime.

Naming and serde attributes

Fields are named in snake_case per Rust style. When every key is already camelCase, a single #[serde(rename_all = "camelCase")] is emitted; otherwise individual fields get #[serde(rename)]. Optional and null fields use Option<T>.

Frequently Asked Questions

How do I convert JSON to Rust structs?+
Paste a JSON object or array into the input box. Serde-ready structs are generated instantly: nested objects become their own pub structs, and everything is copyable with one click.
How are JSON types mapped to Rust?+
Strings become String, integers i64, decimals f64, booleans bool, arrays Vec<T>, string-keyed maps HashMap<String, T>, and unknown or mixed shapes fall back to serde_json::Value. Nested objects become separate structs named after their key.
What does #[serde(rename_all = "camelCase")] do?+
It tells serde to accept and emit camelCase keys while your struct fields stay snake_case per Rust conventions. When only some fields need renaming, a per-field #[serde(rename = "...")] is used instead, and missing or null values become Option<T>.
Is my JSON uploaded to a server?+
No. All conversion runs locally in your browser — nothing is sent, stored, or logged.

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