Read Local Files¶

JSON¶

Reading the file using Bundle Main URL. SO

struct Person : Codable {
    let name: String
    let lastName: String
    let age: Int
}

func loadJson(fileName: String) -> Person? {
   let decoder = JSONDecoder()
   guard
        let url = Bundle.main.url(forResource: fileName, withExtension: "json"),
        let data = try? Data(contentsOf: url),
        let person = try? decoder.decode(Person.self, from: data)
   else {
        return nil
   }

   return person
}

Parse Local JSON

Apple Working with JSON

https://stackoverflow.com/questions/24410881/reading-in-a-json-file-using-swift

Error Parsing JSON¶

Error Domain=NSCocoaErrorDomain Code=3840 "Badly formed object around¶

This could be due to your object or its value doesn't conform to proper primitive types like INT, Bool, String, Date, ExpressibleByNilLiteral.

Sometimes a JSON object described below

{
    "key1": "Value"),
    "key2": "Value2"
}

Might have extra ) or } or " value in that JSON file.

Error Domain=NSCocoaErrorDomain Code=3840 "Something looked like a 'null' but wasn't around line¶

This could be due to your object or its value doesn't conform to proper primitive types like ExpressibleByNilLiteral.

Sometimes a JSON object described below

{
    "key1": nil,
    "key2": null
}

Might need to swap the nil with null type for JSON parsing to work. Maybe because JSON doesn't have nil defined and it has equivalent null type.