github.com/apify/fingerprint-generator

Fingerprint generator

NodeJs package for generating realistic browser fingerprints and matching headers.

Works best with the Fingerprint injector.

• Installation
• Usage
• Result example
• API Reference

Installation

Run the npm install fingerprint-generator command. No further setup is needed afterwards.

Usage

To use the generator, you need to create an instance of the FingerprintGenerator class which is exported from this package. Constructor of this class accepts a HeaderGeneratorOptions object, which can be used to globally specify what kind of fingerprint and headers you are looking for:

const FingerprintGenerator = require('fingerprint-generator');
let fingerprintGenerator = new FingerprintGenerator({
        browsers: [
            {name: "firefox", minVersion: 80},
            {name: "chrome", minVersion: 87},
            "safari"
        ],
        devices: [
            "desktop"
        ],
        operatingSystems: [
            "windows"
        ]
});

You can then get the fingerprint and headers using the getFingerprint method, either with no argument, or with another HeaderGeneratorOptions object, this time specifying the options only for this call (overwriting the global options when in conflict) and using the global options specified beforehands for the unspecified options:

let { fingerprint, headers } = fingerprintGenerator.getFingerprint({
        operatingSystems: [
            "linux"
        ],
        locales: ["en-US", "en"]
});

This method always generates a random realistic fingerprint and a matching set of headers, excluding the request dependant headers, which need to be filled in afterwards. Since the generation is randomized, multiple calls to this method with the same parameters can generate multiple different outputs.

Result example

Fingerprint that might be generated for the usage example above:

{
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64; rv:90.0) Gecko/20100101 Firefox/90.0",
  "cookiesEnabled": true,
  "timezone": "Europe/Prague",
  "timezoneOffset": -60,
  "audioCodecs": {
    "ogg": "probably",
    "mp3": "maybe",
    "wav": "probably",
    "m4a": "maybe",
    "aac": "maybe"
  },
  "videoCodecs": {
    "ogg": "probably", 
    "h264": "probably", 
    "webm": "probably"
  },
  "videoCard": [
    "Intel Open Source Technology Center",
    "Mesa DRI Intel(R) HD Graphics 4600 (HSW GT2)"
  ],
  "productSub": "20100101",
  "hardwareConcurrency": 8,
  "multimediaDevices": { 
    "speakers": 0, 
    "micros": 0, 
    "webcams": 0
  },
  "platform": "Linux x86_64",
  "pluginsSupport": true,
  "screenResolution": [ 1920, 1080 ],
  "availableScreenResolution": [ 1920, 1080 ],
  "colorDepth": 24,
  "touchSupport": { 
    "maxTouchPoints": 0, 
    "touchEvent": false, 
    "touchStart": false
  },
  "languages": [ "en-US", "en" ]
}

And the matching headers:

{
  "user-agent": "Mozilla/5.0 (X11; Linux x86_64; rv:90.0) Gecko/20100101 Firefox/90.0",
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
  "accept-language": "en-US,en;q=0.9",
  "accept-encoding": "gzip, deflate, br",
  "upgrade-insecure-requests": "1",
  "te": "trailers"
}

API Reference

All public classes, methods and their parameters can be inspected in this API reference.

FingerprintGenerator

Fingerprint generator - randomly generates realistic browser fingerprints

• FingerprintGenerator
  • new FingerprintGenerator(options)
  • .getFingerprint(options, requestDependentHeaders)

---

new FingerprintGenerator(options)

Param	Type	Description
options	HeaderGeneratorOptions	default header generation options used unless overridden

---

fingerprintGenerator.getFingerprint(options, requestDependentHeaders)

Generates a fingerprint and a matching set of ordered headers using a combination of the default options specified in the constructor and their possible overrides provided here.

Param	Type	Description
options	HeaderGeneratorOptions	specifies options that should be overridden for this one call
requestDependentHeaders	Object	specifies known values of headers dependent on the particular request

---

BrowserSpecification

Param	Type	Description
name	string	One of chrome, firefox and safari.
minVersion	number	Minimal version of browser used.
maxVersion	number	Maximal version of browser used.
httpVersion	string	Http version to be used to generate headers (the headers differ depending on the version). Either 1 or 2. If none specified the httpVersion specified in HeaderGeneratorOptions is used.

---

HeaderGeneratorOptions

Param	Type	Description
browsers	Array.<(BrowserSpecification|string)>	List of BrowserSpecifications to generate the headers for, or one of chrome, firefox and safari.
operatingSystems	Array.<string>	List of operating systems to generate the headers for. The options are windows, macos, linux, android and ios.
devices	Array.<string>	List of devices to generate the headers for. Options are desktop and mobile.
locales	Array.<string>	List of at most 10 languages to include in the Accept-Language request header in the language format accepted by that header, for example en, en-US or de.
httpVersion	string	Http version to be used to generate headers (the headers differ depending on the version). Can be either 1 or 2. Default value is 2.

---