JSON to Rust Struct

serde is Rust's de-facto serialization and deserialization framework. It is used by virtually every Rust project that works with JSON, TOML, YAML, MessagePack, or other data formats. The serde_json crate adds JSON support on top of serde.

To deserialize a JSON response into a Rust type, you derive Deserialize on your struct and call serde_json::from_str() or serde_json::from_value(). Writing these structs manually for complex API responses is time-consuming — this tool generates the complete struct hierarchy from any JSON with proper #[serde(rename)] attributes for keys that do not follow Rust snake_case conventions.

Input JSON:

{
  "id": 1,
  "user_name": "alice",
  "is_active": true,
  "score": 9.5,
  "address": { "city": "Berlin" }
}

Generated Rust structs:

use serde::{Deserialize, Serialize};

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

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Root {
    pub id: i64,
    pub user_name: String,
    pub is_active: bool,
    pub score: f64,
    pub address: Address,
}

[dependencies]
serde = { version = "1", features = ["derive"] }
serde_json = "1"

Parse JSON into your struct with serde_json::from_str::<Root>(&json_str)?.