Problem loading JSON resource in SWIFT package - json

Question

I am trying to load a JSON file that is bundled with a Swift package I am working on.
The JSON file is called config.json and it is located in my project under /Sources/<Target>/data/config.json
UPDATE: I have also added the resource to the target in the Package Description as follows:
...
.target(
name: "MyPackage",
resources: [
.process("data/config.json")
]
),
...
I am trying to load it using the following code:
guard let sourcesURL = Bundle.main.url(forResource: "config", withExtension: "json") else {
fatalError("Could not find config.json")
}
... but I keep getting nil. Has anyone had an issue like this? Any idea what I'm doing wrong?

Answer 1

You should use module
Bundle.module.url(forResource: "config", withExtension: "json")
And you need to make sure the file is included when building by adding below to your target in Package.swift
resources: [
.copy("data/config.json") //This could alo be .process
])
The above assumes that the resource is loaded from within the same package, if you want to load a resource from another package you can use the following general solution.
First define a constant in the package that holds the bundle identifier for the package, for instance in an extension to Bundle
extension Bundle {
public static let myPackageNameBundleIdentifier = Bundle.module.bundleIdentifier!
}
And then create an instance of that Bundle when loading the resource in another package or the app
if let bundle = Bundle(identifier: Bundle.myPackageNameBundleIdentifier) {
let url = bundle.url(forResource: "config", withExtension: "json")
// ...
}