post: Processing JSON in Rust

[duyet]

How to process JSON in Rust using the serde crate. JSON is a popular data format for exchanging information on the web, but it can be tricky to work with in Rust because of its dynamic nature. Luckily, serde makes it easy to serialize and deserialize JSON data with minimal boilerplate code.

First, we need to add serde and serde_json as dependencies in our Cargo.toml file:

[dependencies]
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"

Next, we need to define a struct that represents the JSON data we want to process. For this example, let's use a simple user profile with a name, age, and email:

#[derive(Serialize, Deserialize)]
struct User {
    name: String,
    age: u32,
    email: String,
}

Now we can use serde_json::from_str() to parse a JSON string into a User instance:

let json = r#"
{
    "name": "Alice",
    "age": 25,
    "email": "alice@example.com"
}
"#;

let user: User = serde_json::from_str(json).unwrap();
println!("Name: {}, Age: {}, Email: {}", user.name, user.age, user.email);

We can also use serde_json::to_string() to convert a User instance back into a JSON string:

let user = User {
    name: "Bob".to_string(),
    age: 30,
    email: "bob@example.com".to_string(),
};

let json = serde_json::to_string(&user).unwrap();
println!("{}", json);