JSON to Rust Struct Converter

Rust structs from a JSON sample

Paste a JSON document and get structs annotated for serde. Each object shape becomes a struct, each repeated string set becomes an enum, and every type carries #[derive(Serialize, Deserialize)] plus the traits you select.

Example

{ "id": 7, "email": null, "orders": [{ "sku": "X1", "qty": 2 }, { "sku": "X2", "qty": 1, "gift": true }] }

use serde::{Serialize, Deserialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Customer {
    pub id: i64,
    pub email: Option<serde_json::Value>,
    pub orders: Vec<Order>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Order {
    pub sku: String,
    pub qty: i64,
    pub gift: Option<bool>,
}

email is Option<serde_json::Value> because the sample shows only null, so nothing narrower can be claimed. A second sample with a string there would produce Option<String>.

Derives and density

derive Debug and derive Clone are on by default; derive PartialEq is off because floating-point fields make equality a judgement call. Dense removes the blank line between fields. Usage comment controls the commented example at the top that shows how to call serde_json::from_str.

Limits

A field that mixes incompatible types across the sample becomes an untagged enum with one variant per type, which serde deserializes by trying each in order. Dates become String unless date inference is on, in which case they still render as String: the Rust renderer does not pull in chrono, so parse them yourself after decoding.