Answer by Burhanuddin Sunelwala for Syntax to put a variable in a string in swift3

let variable = 123final let urlString = "https://ozsqiqjf.preview.infomaniak.website/empdata_\(variable).json"

\(variable) is what you need

OR

use string formatting

let variable = 123final let urlString = String(format:"https://ozsqiqjf.preview.infomaniak.website/empdata_%d.json", variable)