JSON to Rust struct (serde)

How to use it

1. Enter json input and root type name.
2. The result appears straight away and updates as you edit.
3. Copy the result, or copy a link that keeps the same values to share it.

How it is calculated

String, i64, f64, bool, Vec<T> and serde_json::Value, with a struct per object deriving Serialize and Deserialize. Fields are snake_case, #[serde(rename)] is added when a name differs from the key, and a field that can be null or missing becomes Option<T>.

Example

Inputs: Root type name = Root. Result: Generated code: use serde::{Deserialize, Serialize}; #[derive(Debug, Clone, Serialize, Deserialize)] pub struct Root { pub id: i64, pub name: String, pub email: String, pub is_active: bool, pub balance: f64, pub tags: Vec<String>, pub address: Address, pub orders: Vec<Order>, } #[derive(Debug, Clone, Serialize, Deserialize)] pub struct Address { pub city: String, pub postal_code: String, } #[derive(Debug, Clone, Serialize, Deserialize)] pub struct Order { pub order_id: String, pub total: f64, pub coupon: Option<String>, }; Types generated: 3; Fields: 13.

{
  "id": 1024,
  "name": "Sara Ahmed",
  "email": "sara@example.com",
  "is_active": true,
  "balance": 1520.75,
  "tags": ["vip", "riyadh"],
  "address": { "city": "Riyadh", "postal_code": "12211" },
  "orders": [
    { "order_id": "A-1", "total": 99.5, "coupon": "EID10" },
    { "order_id": "A-2", "total": 120, "coupon": null }
  ]
}

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Root {
    pub id: i64,
    pub name: String,
    pub email: String,
    pub is_active: bool,
    pub balance: f64,
    pub tags: Vec<String>,
    pub address: Address,
    pub orders: Vec<Order>,
}

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

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Order {
    pub order_id: String,
    pub total: f64,
    pub coupon: Option<String>,
}

Limits and caveats

• Needs serde with the derive feature and serde_json in Cargo.toml.
• Every whole number becomes i64 and every decimal f64.