A Swift library that makes reading and writing JSON data objects in Swift and converting to the appropriate Swift data objects easy.

To read a value from a JSON string, use the get function:

let jsonString = "{\"name\": \"John\", \"age\": 30, \"city\": \"New York\"}"

if let age = get(from: jsonString, key: "age", defaultValue: 10) as? Int {
    print("Age: \(age)")
}

This function contains an optional defaultValue parameter. This parameter will be returned if there is an issue with the JSON data or if the value does not exist.

To write data in a JSON string, use the set function:

let jsonString = "{\"name\": \"John\", \"age\": 30, \"city\": \"New York\"}"

if let updatedJsonString = set(in: jsonString, forKey: "age", value: 31) {
    print("Updated JSON String: \(updatedJsonString)")
}

If there is an error with the JSON data, then a nil value will be returned. Otherwise, the new JSON string with the updated data will be returned.