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Overview

In this quickstart, you’ll add Fingerprint to a new Xcode iOS app and identify the user’s device. The example use case we’ll use for this quickstart is stopping new account fraud, where attackers create multiple fake accounts to abuse promotions, exploit systems, or evade bans. However, the steps you’ll follow apply to most use cases. By identifying the device behind each sign-up attempt, login, or transaction, you can flag and block suspicious users early. This guide focuses on the front-end mobile integration. You’ll install the Fingerprint iOS SDK and initialize the client to generate a request ID to send to your back end for analysis. To see how to implement fraud prevention with this ID, continue to one of our back-end quickstarts after completing this quickstart.
Estimated time: < 10 minutes

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Prerequisites

Before you begin, make sure you have the following:
  • Xcode installed (latest version)
  • Basic knowledge of Swift and iOS development
  • A Fingerprint account and public API key (see below)
This quickstart only covers the front-end setup. You’ll need a back-end server to receive and process the device identification event to enable fraud detection. Check out one of our back-end quickstarts after completing this quickstart.

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1. Create a Fingerprint account and get your API key

  1. Sign up for a free Fingerprint trial if you don’t already have an account.
  2. After signing in, go to the API keys page in the dashboard.
  3. Copy your public API key; you’ll need it to initialize the Fingerprint client agent.

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2. Set up your project

To get started, create a new Xcode project. If you already have a project you want to use, you can skip to the next section.
  1. Open Xcode and create a new project.
  2. Click on iOS and select App, then click Next.
  3. Enter a name (e.g., FingerprintQuickstart), and an organization identifier (e.g., com.example), and make sure to use Swift and SwiftUI.
  4. Click Next, choose a save location, and create the project.

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3. Install the Fingerprint SDK

To integrate Fingerprint into your iOS app, add the package to your project.
  1. In Xcode, go to File > Add Package Dependencies…
  2. Enter the package URL: https://github.com/fingerprintjs/fingerprintjs-pro-ios
  3. Choose the latest version and click Add Package.
  4. In the Choose Package Products pop-up, make sure to check your app target (e.g., FingerprintQuickstart) under “Add to Target” so the SDK is properly linked.

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4. Initialize the SDK

Open your ContentView.swift or app entry point and:
  1. Import the SDK:
ContentView.swift
import FingerprintPro
  1. Initialize the SDK with your public API key and region:
ContentView.swift
let region: Region = .eu
let configuration = Configuration(
    apiKey: "<your-public-api-key>",
    region: region,
    extendedResponseFormat: true
)
  1. Replace <your-public-api-key> with your actual public API key from the Fingerprint dashboard. Use .global, .eu, or .ap based on your workspace region. See region guide.

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5. Trigger visitor identification

Now that the Fingerprint client is initialized, you can identify the visitor when needed. In this case, that’s when the user taps a Create Account button. When making the visitor identification request, you will receive the visitorId as well as a requestId. Instead of using the visitorId returned directly on the front end (which could be tampered with), you’ll send the requestId to your back end. This ID is unique to each identification event. Your server can then use the Fingerprint Events API to retrieve complete identification data, including the trusted visitor ID and other actionable insights like whether they are using a VPN or are a bot.

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Add a basic sign-up UI

  1. Create a new SwiftUI function for the account creation screen. It will display a simple form with username and password fields, along with a Create Account button:
ContentView.swift
func AccountCreationForm(
    username: Binding<String>,
    password: Binding<String>,
    logOutput: Binding<String>,
    onSubmit: @escaping () -> Void
) -> some View {
    VStack(spacing: 20) {
        Text("Create Account")
            .font(.title)
            .foregroundColor(.orange)

        TextField("Username", text: username)
            .textFieldStyle(.roundedBorder)
            .autocapitalization(.none)

        SecureField("Password", text: password)
            .textFieldStyle(.roundedBorder)

        Button("Create Account") {
            onSubmit()
        }
        .buttonStyle(.borderedProminent)
        .tint(.orange)

        if !logOutput.wrappedValue.isEmpty {
            Text("Log: \(logOutput.wrappedValue)")
                .font(.caption)
                .foregroundColor(.gray)
                .multilineTextAlignment(.center)
                .padding(.top, 10)
        }
    }
}
  1. In the ContentView struct; just before the body variable; add the createAccount() function that would be triggered when the Create Account button is clicked:
ContentView.swift
struct ContentView: View {
    @State private var username = ""
    @State private var password = ""
    @State private var logOutput = ""

    let fingerprintClient = FingerprintProFactory.getInstance(configuration)

    func createAccout() async {
        do {
            let response = try await fingerprintClient.getVisitorIdResponse()

            let requestId = response.requestId

            print("Request ID: \(requestId)")

            // Send username, password, and requestId to your backend server for processing

        } catch {
            print("Fingerprint error: \(error)")
            logOutput = "Error: \(error.localizedDescription)"
        }
    }
    //...
}
  1. Update the body variable of the ContentView struct with the AccountCreationForm function:
ContentView.swift
struct ContentView: View {
    @State private var username = ""
    @State private var password = ""
    @State private var logOutput = ""

    let fingerprintClient = FingerprintProFactory.getInstance(configuration)

    func createAccount() async {
        do {
            let response = try await fingerprintClient.getVisitorIdResponse()

            let requestId = response.requestId

            print("Request ID: \(requestId)")

            // Send username, password, and requestId to your backend server for processing
        } catch {
            print("Fingerprint error: \(error)")
            logOutput = "Error: \(error.localizedDescription)"
        }
    }

    var body: some View {
        VStack(spacing: 20) {
            AccountCreationForm(
                username: $username,
                password: $password,
                logOutput: $logOutput,
                onSubmit:{
                    Task {
                        await createAccount()
                    }
                }
            )
        }
        .padding()
    }
}
This interface:
  • Displays a basic form for account creation.
  • Calls getVisitorIdResponse() to identify the visitor.
  • Captures the requestId, which you’ll forward to your server for analysis.

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6. Run the app

  1. Select an iOS simulator or real device in Xcode.
  2. Build and run the app (⌘R).
  3. Enter a username and password then click Create Account.
  4. Check your Xcode console for something like:
Output
Request ID: 1753730090897.s4bWk4
You’re now successfully identifying the device and capturing the request ID and are ready to send it to your back end for further fraud prevention logic!

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Next steps

To use the identification data for fraud detection (like blocking repeat fake account creation attempts), you’ll need to send the requestId to your back end. From there, your server can call the Fingerprint Events API to retrieve the full visitor information and make decisions. Check out these related resources: