Rewrite the provided Fingerprint quickstart example in the requested language and/or framework using modern patterns and best practices for that ecosystem. The quickstart should closely follow the format of the example and walk through building a simple “Create Account” flow for detecting new account fraud using Fingerprint.

The tutorial should guide the reader through installing and integrating the appropriate Fingerprint SDK, receiving the username, password, and requestId at a POST / account creation route, getting the full Fingerprint identification event, and checking for existing accounts associated with the current device (using visitorId). The deliverable should be a step-by-step tutorial written in Markdown that includes all steps and code needed to follow along. Your code and tutorial will be tested for accuracy, make sure you follow the correct functions, object structures, etc., for the SDK.

The quickstart should:

• Clearly explain what the developer is building and aim to have the expected time be less than 10 minutes.
• Guide the developer through setting up a minimal starter project (e.g., using CLI or basic starter template).
• Keep things as simple as possible; this is not a guide on how to set up a full production application. For example: use a simple database that is easy to set up, like SQLite, don’t create a whole bunch of files when one or two would do, it is ok to exclude best practices for password handling as long as it is mentioned as a note, etc.
• Include a simple test or logging step to confirm that the integration works and that multiple account creation is blocked. Note that this quickstart will be paired with a front-end quickstart, so it should have CORS settings to make things easy.
• Explain the steps of the Fingerprint implementation instead of just having large code blocks. Focus on minimal code comments or inline explanations; keep those in the instructions.
• It is OK (and preferred) to copy some of the instructions or explanations word-for-word if they do not need to be updated for this specific quickstart.

Example Node Quickstart

Markdown version

Overview

In this quickstart, you’ll add Fingerprint to a Node server using the web framework Fastify to prevent fraudulent account creation.

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. You can flag and block suspicious users by identifying the device behind each sign‑up attempt, login, or transaction.

In this quickstart, you'll learn how to:

• Set up a Fastify server with a Fingerprint integration
• Retrieve visitor identification data using the Server API
• Block bots and suspicious devices
• Prevent multiple signups from the same device