Compile-time-checked URLs


Tool for avoiding using the URL(string:) initializer with optional result, instead introducing a compile time URL validity check. Note, this does not check for website availability, but if the URL is formatted correctly.


Swift Package Manager

The Swift Package Manager is a tool for automating the distribution of Swift code and is integrated into the swift compiler.

Once you have your Swift package set up, adding SafeURL as a dependency is as easy as adding it to the dependencies value of your Package.swift.

dependencies: [
    .package(url: "")
targets: [
        name: "<MyTargetName>",
        dependencies: ["SafeURL"],
        plugins: ["SafeURLPlugin"]


// This will compile
let validUrl = URL(safeString: "https://example.tld")
// This won't
let invalidUrl = URL(safeString: "https://example./tld")

SafeURL requires its parameter to be a single simple string literal

If a file contains the comment // safeurl:warn, invalid URLs in this file will be compiled and will show a warning instead of an error. Note that this is not recommended, as this will still cause a force-stop on runtime.


  • Swift Tools 5.6.0
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Last updated: Tue May 23 2023 16:17:20 GMT-0500 (GMT-05:00)