Swift 5 JSONDecoder decode JSON with field name having a space eg "post title": "Hello World"

Question

I'm currently using JSONDecoder to parse json into objects with Swift 5. I'm just realizing now that part of the JSON is bad JSON. It has a field name with a space: "Post Title". I'm not sure why it is like this, and I'm aware it is bad practice for JSON to be setup like this, but there's not much I can do on the JSON side. Is there a way to use JSON decoder to get that field as is?

I've researched this a ton, but since it is an issue with bad json, I'm not finding much online other than creating a custom decoder/deserializer (which I'm trying to avoid).

JSON:

{
    "Post Title":"Hello World"
}

Struct:

struct Post: Decodable {
    var PostTitle: String
}

Decoder:

let jsonObject = try jsonDecoder.decode(Post.self, from: responseData)

Thank you in advance!

Gustavo Vollbrecht · Accepted Answer · 2020-03-21T11:30:56.603

12

For custom keys, use CodingKeys to match JSON keys.

struct Post : Codable {

    var PostTitle: String

    private enum CodingKeys : String, CodingKey {
        case PostTitle = "Post Title"
    }
}

Note: you should use lowercased starting letter for variables.

edited Mar 21 '20 at 11:30

answered Aug 19 '19 at 22:46

Gustavo Vollbrecht

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Thank you, this worked! – voo_doo_juju Aug 20 '19 at 14:34
It is mentioned in the documentation to https://developer.apple.com/documentation/foundation/archives_and_serialization/encoding_and_decoding_custom_types I need to focus on documentation then it is better to post on stackoverflow. – Pulkit Kumar Singh Jun 19 '20 at 06:22

Swift 5 JSONDecoder decode JSON with field name having a space eg "post title": "Hello World"

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