Fingerprint Server API Node.js SDK

Fingerprint is a device intelligence platform offering 99.5% accurate visitor identification.

The Fingerprint Server Node SDK is an easy way to interact with the Fingerprint Server API from your Node application. You can retrieve visitor history or individual identification events.

Requirements

TypeScript support:

• TypeScript 4.5.5 or higher

Supported runtimes:

• Node.js 18 LTS or higher (we support all Node LTS releases before end-of-life).

• Deno and Bun might work but are not actively tested.

• "Edge" runtimes might work with some modifications but are not actively tested.

  See "edge" runtimes compatibility

  This SDK can be made compatible with JavaScript "edge" runtimes that do not support all Node APIs, for example, Vercel Edge Runtime, or Cloudflare Workers.

  To make it work, replace the SDK's built-in fetch function (which relies on Node APIs) with the runtime's native fetch function. Pass the function into the constructor with proper binding:

  const client = new FingerprintJsServerApiClient({
    region: Region.EU,
    apiKey: apiKey,
    fetch: fetch.bind(globalThis),
  })

How to install

Install the package using your favorite package manager:

• NPM:

  npm i @fingerprintjs/fingerprintjs-pro-server-api

• Yarn:

  yarn add @fingerprintjs/fingerprintjs-pro-server-api

• pnpm:

  pnpm i @fingerprintjs/fingerprintjs-pro-server-api

Getting started

Initialize the client instance and use it to make API requests. You need to specify your Fingerprint Secret API key and the region of your Fingerprint application.

import {
  FingerprintJsServerApiClient,
  Region,
} from '@fingerprintjs/fingerprintjs-pro-server-api'

const client = new FingerprintJsServerApiClient({
  apiKey: '<SECRET_API_KEY>',
  region: Region.Global,
})

// Get visit history of a specific visitor
client.getVisitorHistory('<visitorId>').then((visitorHistory) => {
  console.log(visitorHistory)
})

// Get a specific identification event
client.getEvent('<requestId>').then((event) => {
  console.log(event)
})

See the Examples folder for more detailed examples.

Error handling

The Server API methods can throw RequestError. When handling errors, you can check for it like this:

import {
  RequestError,
  FingerprintJsServerApiClient,
  TooManyRequestsError,
} from '@fingerprintjs/fingerprintjs-pro-server-api'

const client = new FingerprintJsServerApiClient({
  apiKey: '<SECRET_API_KEY>',
  region: Region.Global,
})

// Handling getEvent errors
try {
  const event = await client.getEvent(requestId)
  console.log(JSON.stringify(event, null, 2))
} catch (error) {
  if (error instanceof RequestError) {
    console.log(error.responseBody) // Access parsed response body
    console.log(error.response) // You can also access the raw response
    console.log(`error ${error.statusCode}: `, error.message)
  } else {
    console.log('unknown error: ', error)
  }
}

// Handling getVisitorHistory errors
try {
  const visitorHistory = await client.getVisitorHistory(visitorId, {
    limit: 10,
  })
  console.log(JSON.stringify(visitorHistory, null, 2))
} catch (error) {
  if (error instanceof RequestError) {
    console.log(error.status, error.error)
    if (error instanceof TooManyRequestsError) {
      retryLater(error.retryAfter) // Needs to be implemented on your side
    }
  } else {
    console.error('unknown error: ', error)
  }

  // You can also check for specific error instance
  // if(error instanceof VisitorsError403) {
  //    Handle 403 error...
  // }
}

Webhooks

Webhook types

When handling Webhooks coming from Fingerprint, you can cast the payload as the built-in VisitWebhook type:

import { VisitWebhook } from '@fingerprintjs/fingerprintjs-pro-server-api'

const visit = visitWebhookBody as unknown as VisitWebhook

Webhook signature validation

Customers on the Enterprise plan can enable Webhook signatures to cryptographically verify the authenticity of incoming webhooks. This SDK provides a utility method for verifying the HMAC signature of the incoming webhook request.

To learn more, see example/validateWebhookSignature.mjs or read the API Reference.

Sealed results

Customers on the Enterprise plan can enable Sealed results to receive the full device intelligence result on the client and unseal it on the server. This SDK provides utility methods for decoding sealed results.

To learn more, see example/unsealResult.mjs or the API Reference.

Deleting visitor data

Customers on the Enterprise plan can Delete all data associated with a specific visitor to comply with privacy regulations. See example/deleteVisitor.mjs or the API Reference.

API Reference

See the full API reference.

Support and feedback

To report problems, ask questions, or provide feedback, please use Issues. If you need private support, you can email us at [email protected].

License

This project is licensed under the MIT license.