json-extract-macro

Access nested JSON in 1 line of code

This macro reduces boilerplate when using serde_json::Value variants when trying to get into a nested property.

let designer: Option<String> = json_extract!("brand.tesla.model.designer", &res, String);

println!("Who tf is this designer? {}",designer.unwrap_or_default());

or

if let Value::Object(brand) = json_file {
        let brand = brand.get("brand").unwrap();
        if let Value::Object(tesla) = brand {
            let tesla = tesla.get("tesla").unwrap();
            if let Value::Object(model) = tesla {
                let model = model.get("model").unwrap();
                if let Value::String(designer) = model {
                    println!("Who tf is this designer? {}",designer.to_owned());
                }
            }
        }
    }

Macro args

The macro accepts 3 arguments:

1. A &str containg the path, separated by "."
2. The serde_json::Value variable to read.
3. The type of the property we want to get.

Types supported

json_serde::Value has the following variants:

• Array
• Bool
• Null
• Number
• Object
• String

The third parameter to pass in the macro is a Rust type, so, things we can pass if we want to get data from some variants: