Which numeric types are used?

Whole numbers become i64 and decimals become f64. Change them by hand if you need u32, i32 or a fixed-precision type.

When should I wrap fields in Option ?

Enable the switch when the API can omit fields or send null — otherwise deserialization fails with a missing field error.

What happens to unknown or null values?

They are typed as serde_json::Value so nothing is lost, and you can tighten the type once you know the real shape.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

JSON to Rust Struct (serde)

Turn JSON into serde-ready Rust structs.

Support

Works Offline

Privacy First

No Login

No API

JSON input

Generate serde-ready Rust structs from a JSON sample

Root struct name

Wrap in Option<T>

Safer when fields can be missing or null

Rust structs

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Root {
    pub id: i64,
    #[serde(rename = "userName")]
    pub user_name: String,
    pub score: f64,
    pub active: bool,
    pub tags: Vec<String>,
    pub profile: Profile,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Profile {
    pub city: String,
    pub zip: String,
}

About the JSON to Rust Struct (serde)

Generate Rust structs from a JSON sample with Serialize and Deserialize derives, snake_case field names, automatic #[serde(rename)] when the JSON key differs, nested structs, typed Vec fields and optional Option<T> wrapping. Runs entirely in your browser.

Examples

Renamed key

{ "userName": "ada" }

Output

#[serde(rename = "userName")] pub user_name: String,

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-24 · Runs entirely in your browser

JSON to Rust Struct (serde)

About the JSON to Rust Struct (serde)

Examples

Keyboard shortcuts

Related tools

Android strings.xml ↔ JSON Converter

Csv To Json

Csv To Markdown Table

CSV to SQL INSERT

CSV to XML

CSV Viewer & Editor

Frequently asked questions

Which numeric types are used?

When should I wrap fields in Option<T>?

What happens to unknown or null values?

Is my data uploaded to a server?

Does it work offline and on mobile?