diff --git a/package.json b/package.json
index 5a539782..aa887d2b 100755
--- a/package.json
+++ b/package.json
@@ -221,8 +221,11 @@
     "@babel/traverse": "7.23.2",
     "@jazzer.js/core": "^1.4.0",
     "@playwright/test": "~1.32.2",
+    "@types/node": "^22.9.1",
+    "@types/node-fetch": "^2.6.12",
     "jshint": "~2.13.6",
     "mocha": "~8.2.0",
+    "node-fetch": "^2.7.0",
     "requirejs": "2.3.2",
     "safe-regex": "^2.1.1",
     "tsd": "^0.29.0",
diff --git a/src/main/ua-parser.d.ts b/src/main/ua-parser.d.ts
index 150d8672..03be66ee 100644
--- a/src/main/ua-parser.d.ts
+++ b/src/main/ua-parser.d.ts
@@ -2,6 +2,9 @@
 // Project: https://github.com/faisalman/ua-parser-js
 // Definitions by: Faisal Salman <https://github.com/faisalman>
 
+import type { IncomingHttpHeaders } from 'http';
+import type { Headers as FetchAPIHeaders } from 'node-fetch';
+
 declare namespace UAParser {
     
     interface IData<T> {
@@ -50,11 +53,12 @@ declare namespace UAParser {
     type RegexMap = ((RegExp | string | (string | RegExp | Function)[])[])[];
     type UAParserProps = 'browser' | 'cpu' | 'device' | 'engine' | 'os';
     type UAParserExt = Partial<Record<UAParserProps, RegexMap>> | Partial<Record<UAParserProps, RegexMap>>[];
+    type UAParserHeaders = Record<string, string> | IncomingHttpHeaders | FetchAPIHeaders;
 
-    export function UAParser(uastring?: string, extensions?: UAParserExt, headers?: Record<string, string>): IResult;
-    export function UAParser(uastring?: string, headers?: Record<string, string>): IResult;
-    export function UAParser(extensions?: UAParserExt, headers?: Record<string, string>): IResult;
-    export function UAParser(headers?: Record<string, string>): IResult;
+    export function UAParser(uastring?: string, extensions?: UAParserExt, headers?: UAParserHeaders): IResult;
+    export function UAParser(uastring?: string, headers?: UAParserHeaders): IResult;
+    export function UAParser(extensions?: UAParserExt, headers?: UAParserHeaders): IResult;
+    export function UAParser(headers?: UAParserHeaders): IResult;
 
     export class UAParser {
         
diff --git a/test/mocha-test.js b/test/mocha-test.js
index 9b35330e..ecd7fe0f 100644
--- a/test/mocha-test.js
+++ b/test/mocha-test.js
@@ -10,6 +10,7 @@ var cpus        = require('./specs/cpu-all.json');
 var devices     = readJsonFiles('test/specs/devices');
 var engines     = require('./specs/engine-all.json');
 var os          = require('./specs/os-all.json');
+var { Headers } = require('node-fetch');
 
 function readJsonFiles(dir) {
     var list = [];
@@ -354,6 +355,13 @@ describe('Read user-agent data from req.headers', function () {
         let engine = UAParser(req.headers).engine;
         assert.strictEqual(engine.name, "EdgeHTML");
     });
+
+    it('Fetch API\'s Header can be passed directly into headers', () => {
+        const reqHeaders = new Headers();
+        reqHeaders.append('User-Agent', 'Midori/0.2.2 (X11; Linux i686; U; en-us) WebKit/531.2+');
+        const { browser } = UAParser(reqHeaders);
+        assert.strictEqual(browser.is('Midori'), true);
+    });
 });
 
 describe('Map UA-CH headers', function () {