rustHow to get a value by key from JSON in Rust?

Getting a value by key from JSON in Rust is easy with the serde_json crate.

Example code

extern crate serde_json;

fn main() {
    let data = r#"
        {
            "name": "John Doe",
            "age": 43
        }
    "#;

    let v: serde_json::Value = serde_json::from_str(data).unwrap();
    let name = v["name"].as_str().unwrap();

    println!("Name: {}", name);
}

Output example

Name: John Doe

The code above:

• imports the serde_json crate (extern crate serde_json;)
• creates a JSON string (let data = r#"{...}"#;)
• parses the JSON string into a serde_json::Value (let v: serde_json::Value = serde_json::from_str(data).unwrap();)
• gets the value of the name key (let name = v["name"].as_str().unwrap();)
• prints the value of the name key (println!("Name: {}", name);)

Helpful links

• serde_json crate
• serde_json documentation

Edit this code on GitHub