Get category id from category name

ViewController.swift

class Category: CustomStringConvertible {
    var id: String
    var name: String

    init(id: String, name: String) {
        self.id = id
        self.name = name
    }
    
    var description: String {
        return "id=\(id), name=\(name)\n"
    }
}

class ViewController: UIViewController {
    
    var filteredCategories: Array<Category> = []

    override func viewDidLoad() {
        super.viewDidLoad()
        self.jsonParser()
    }

    func jsonParser() {
        let urlPath = "https://api.foursquare.com/v2/venues/categories?oauth_token=(YOUR_TOKEN)&v=20170313"
        guard let endpoint = URL(string: urlPath) else {
            print("Error creating endpoint")
            return
        }
        
        URLSession.shared.dataTask(with: endpoint) { [weak self] (data, response, error) in
            guard let data = data else {
                print("No data")
                return
            }
            
            guard let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else {
                print("Error parsing JSON")
                return
            }
            
            if let response = json?["response"] as? [String:Any],
                let categories = response["categories"] as? [[String: Any]],
                let strongSelf = self {
                strongSelf.filter(categories: categories, keyword: "restaurant")
                
                print("Result: ", strongSelf.filteredCategories)
            }
            }.resume()
    }
    
    func filter(categories: [[String:Any]], keyword: String) {
        for category in categories {
            guard let id = category["id"] as? String,
                let name = category["name"] as? String else {
                    continue
            }
            
            if name.lowercased().contains(keyword) {
                let filteredCategory = Category(id: id, name: name)
                self.filteredCategories.append(filteredCategory)
            }
            
            if let subCategories = category["categories"] as? [[String: Any]] {
                self.filter(categories: subCategories, keyword: keyword)
            }
        }
    }
}