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.

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

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

rs 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:

| Value variant | Rust types | | ------ | ------ | | Array | Vec<String>, Vec<bool>, Vec<f64>, Vec<Value> ... | | Bool | bool | | Number | u32, i32, i64, f32, usize ... | | Object | Value | | String | String | | Null | not supported |