Basic Rust Struct from Flat JSON

Generating a Rust Struct from Flat JSON

When the JSON has no nested objects or arrays, the output is a single struct whose fields map one-to-one onto the keys.

Example JSON

{
  "id": 42,
  "name": "Alice",
  "email": "alice@example.com",
  "active": true
}

Generated Rust

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Root {
    pub id: i32,
    pub name: String,
    pub email: String,
    pub active: bool,
}

What the converter decided

• id is a whole number and fits in 32 bits, so it became i32. If the value were larger than 2_147_483_647 the converter would pick i64 instead.
• name and email are JSON strings, so they map to Rust's owned String. If you need to deserialize without owning the data, you can change those to &str and supply a borrowed lifetime — but that is rarely worth the friction.
• active is a JSON boolean, mapped directly to bool.
• The struct is wrapped in a derive line that adds Debug and Clone (handy during development) plus the two serde macros that make serde_json::from_str and serde_json::to_string work without any boilerplate.

Using the struct

let json = r#"{ "id": 42, "name": "Alice", ... }"#;
let user: Root = serde_json::from_str(json)?;

If you prefer a more domain-specific name, change the Root struct input from Root to User. The converter regenerates the output instantly.