Rust:
Working with JSON
How to:
To work with JSON in Rust, the serde crate along with serde_json for serialization and deserialization is extensively used. First, ensure to include these in your Cargo.toml:
[dependencies]
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"Example 1: Deserialize JSON to a Rust Struct
Define a Rust struct and use derive macros for Deserialize and Serialize:
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize)]
struct User {
id: u32,
name: String,
email: String,
}
fn main() {
let json_data = r#"
{
"id": 1,
"name": "Jane Doe",
"email": "[email protected]"
}
"#;
let user: User = serde_json::from_str(json_data).unwrap();
println!("User ID: {}", user.id);
println!("User Name: {}", user.name);
println!("User Email: {}", user.email);
}Output:
User ID: 1
User Name: Jane Doe
User Email: [email protected]Example 2: Serialize a Rust Struct to JSON
Using the same User struct:
let user = User {
id: 1,
name: "Jane Doe".to_string(),
email: "[email protected]".to_string(),
};
let json_data = serde_json::to_string(&user).unwrap();
println!("{}", json_data);Output:
{"id":1,"name":"Jane Doe","email":"[email protected]"}These examples demonstrate the basic flow of deserializing JSON into Rust structures and serializing Rust structures back into JSON strings. Serde provides a rich set of tools for working with JSON, including dealing with optional fields, complex nesting, and types not directly supported by JSON.