Cloudflare Proxy Integration

Fingerprint JS agent v3.6.0 or later is required.

Fingerprint Cloudflare Proxy Integration is responsible for proxying identification and agent-download requests between your website and Fingerprint through Cloudflare. Your website does not strictly need to be behind Cloudflare to use this proxy integration, although that is optimal for ease of setup and maximum accuracy benefits.

The integration consists of three fundamental components:

  • Fingerprint infrastructure.
  • Cloudflare worker — created and managed by Fingerprint, but running in your Cloudflare account.
  • Fingerprint JavaScript agent installed on your website.

Fingerprint creates a Cloudflare Worker that's available on a specific path on your site. The rest of your site is not affected.

Cloudflare worker code is 100% open-source and available on GitHub. Once the Fingerprint JS agent is configured on your site correctly, the worker is responsible for delivering the latest fingerprinting client-side logic as well as proxying identification requests and responses between your site and Fingerprint's APIs.

The benefits of using the Cloudflare Integration

  • Significant increase in accuracy in browsers with strict privacy features such as Safari or Firefox.
  • Cookies are now recognized as “first-party.” This means they can live longer in the browser and extend the lifetime of visitor IDs.
  • Ad blockers will not block our Fingerprint JS agent from loading. Attempts to connect to an external URL will be stopped by most ad blockers while attempts to connect to the same site URL will be allowed.
  • Ad blockers will not block our identification requests since they are sent to the specific path or subdomain that belongs to the same site.
  • Insight and control over the identification requests that can be combined with other Cloudflare features like WAF or Analytics.
  • With the Cloudflare Integration, you can manage unlimited subdomains and paths and provide Fingerprint services to all your customers at any scale while benefiting from all the 1st-party integration improvements.
  • Cookie security: Cloudflare integration drops all the cookies sent from the origin website. The worker code is open-source so this behavior can be transparently verified and audited.
  • Easy to meet compliance and auditing requirements.


The Cloudflare configuration guide on the Fingerprint dashboard will help you set everything up step by step. You can start the guide when creating an account, or later in the App settings.



Newly created accounts

During the Install step of the onboarding flow, select Cloudflare.


Select Cloudflare Integration during onboarding

Existing accounts

Navigate to App Settings, switch to the Integrations tab, and select Cloudflare.


App Settings Page - Cloudflare Integration

After opening the Cloudflare configuration guide, click Get started.

You will proceed to a form where you need to put the information about your Cloudflare account.


Cloudflare Credentials

NameExampleShort description
Cloudflare Account ID88e2a7348d589a61edd0918e57fb136fThe Account ID obtained from the Cloudflare Dashboard.
Cloudflare API TokenYQSnnxWAQiiEh9qM58wZNnyQS7FUdoqGIUAbrh7TAPI Token generated from the Cloudflare's User Profile 'API Tokens' page.

Cloudflare Account ID

The Account ID is required to deploy workers. Go to Cloudflare Workers and copy the Account ID.

Cloudflare API Token

The API Token is required to deploy workers. Go to the API Tokens page, select Create Custom Token, and follow the steps below.

  • Type "" in the name field.
  • Add Account > Workers Scripts > Edit permission.
  • Add Zone > Workers Routes > Edit permission.
  • Select the account in the Account Resources.
  • Select Specific zone > yourwebsite in the Zone Resources.
  • Add IP Filtering >
  • Do not set any TTL.

API Token Creation Form

In the next step, see the summary and click Create Token.


API Token Summary


API Token Safety

When creating an API Token, it is considered best practice to grant it as few privileges as possible. In the example above, the API Token has permissions to only manage workers in your account. Fingerprint will use your API Token for managing the Fingerprint Cloudflare Worker and nothing else.

Fingerprint always encrypts customer data, including API tokens and configuration items. This guarantees that the data we get from our customers is securely transmitted and stored. The Client IP Address Filtering functionality adds an additional layer of security. Safelisting our public Cloudflare service IP address ensures that the API Token can only be used by Fingerprint services and no one else.

After entering Account ID and API Token, proceed to the next step.


Choose domain

Select the same domain you had created the API Token for before from the dropdown menu. If you don't see the domain you wish to use, please contact our support at [email protected].


Cloudflare Worker Review

Confirm to start the deployment process. This process may take several minutes.

When you provide the integration wizard with the information above, we will create a Cloudflare Worker in your Cloudflare account. Cloudflare Worker will be named fingerprint-pro-cloudflare-worker-your-website-com, you will be able to see it in Cloudflare Workers Dashboard once it is deployed.


Do not disrupt worker updates

We are responsible for updating your Cloudflare Worker to ensure visitor identification on your website runs smoothly and keeps up with new browser releases and fingerprinting evasion techniques. Outdated worker configuration can lead to lower accuracy or break visitor identification completely. Don't make any changes that would prevent us from updating your worker:

  • Don't reduce the API Token permissions or revoke it.
  • Don't change the name of the worker (worker names are used as IDs).
  • Don't change the original worker route and configuration.

Fingerprint JS agent configuration

Once the worker is deployed, you need to configure your client-side application accordingly. In this step, you can choose from a variety of frameworks, platforms, and approaches. You can always come back to App settings -> Integrations to find code snippets for different frameworks that reflect your Cloudflare configuration setup.


Code Snippets

Using Multiple Worker Routes

Cloudflare Integration uses Cloudflare Workers, which supports multiple routes. You can add more routes if you need to but don't change the original worker route and configuration created by Fingerprint.


The Cloudflare integration has limited visibility into your Cloudflare environment. If you run into issues, please verify that one of your existing Firewall rules, rate limiting rules, or other Cloudflare restrictions is not disrupting the Fingerprint worker and its path. Get in touch with our support team if necessary.

You can go to Dashboard > App settings > Integrations > Cloudflare to see the integration status and configuration.

Updating the Cloudflare token

If you accidentally delete the Cloudflare API token you provided us with, you can update it inside the Fingerprint dashboard.

Deleting the integration

If something goes unfixably wrong with your integration or Cloudflare worker configuration, you can delete everything and create a new integration from scratch.

  1. Make sure your Fingerprint JS agent is not using the integration URLs you are about to delete.
  2. Go to Integrations > Cloudflare and click Delete integration.

This will delete the Cloudflare worker and all associated records.

Alternative worker subdomain setup (for DNS-only domains)

The Cloudflare configuration guide above assumes your website is added to Cloudflare and proxied through Cloudflare (not DNS-only). If your website proxy status is DNS-only, the worker will not be accessible on the generated path and the provided code snippets will not work.

If you can't proxy your primary domain through Cloudflare, you can work around this issue by hosting the Fingerprint worker on a subdomain. This still requires that your website is added to Cloudflare without proxying (in DNS-only mode).

  1. Follow the installation steps above to deploy the proxy integration worker in your Cloudflare account.
  2. Go to your Cloudflare dashboard.
  3. In the left-hand navigation, click Workers & Pages.
  4. Click on your Fingerprint Cloudflare worker. It will be named like fingerprint-pro-cloudflare-worker-yourwebsite-com.
  5. At the top, click Settings, then switch to the Triggers tab.
  6. Click Add Custom Domain.
  7. Enter a subdomain like and click Add custom domain to confirm. Avoid terms commonly blocked by ad-blockers like fingerprint, fpjs, track, etc.

Your new subdomain will be proxied through Cloudflare, even though your primary domain is not:

Your Fingerprint worker is now accessible on your chosen subdomain. You need to adjust the code snippets provided on the App Settings > Integrations page accordingly. For example:
endpoint: becomes