diff --git a/packages/node/src/__tests__/typedef-tests.ts b/packages/node/src/__tests__/typedef-tests.ts
index c21f363e3..2f8e626f6 100644
--- a/packages/node/src/__tests__/typedef-tests.ts
+++ b/packages/node/src/__tests__/typedef-tests.ts
@@ -97,6 +97,13 @@ export default {
       new Analytics({ writeKey: 'foo', httpClient: globalThis.fetch })
     },
 
+  'HTTPFetchFn options should be the expected type': () => {
+    type BadFetch = (url: string, requestInit: { _bad_object?: string }) => any
+
+    // @ts-expect-error
+    new Analytics({ writeKey: 'foo', httpClient: {} as BadFetch })
+  },
+
   'httpClient setting should be compatible with axios': () => {
     new (class implements HTTPClient {
       async makeRequest(options: HTTPClientRequest) {
diff --git a/packages/node/src/lib/__tests__/abort.test.ts b/packages/node/src/lib/__tests__/abort.test.ts
index ecc4af764..54f350252 100644
--- a/packages/node/src/lib/__tests__/abort.test.ts
+++ b/packages/node/src/lib/__tests__/abort.test.ts
@@ -1,7 +1,9 @@
 import { abortSignalAfterTimeout } from '../abort'
 import nock from 'nock'
-import { fetch } from '../fetch'
 import { sleep } from '@segment/analytics-core'
+import { fetch as _fetch } from '../fetch'
+
+const fetch = _fetch as typeof globalThis.fetch
 
 describe(abortSignalAfterTimeout, () => {
   const HOST = 'https://foo.com'
diff --git a/packages/node/src/lib/http-client.ts b/packages/node/src/lib/http-client.ts
index 87cd02465..3cc33f68d 100644
--- a/packages/node/src/lib/http-client.ts
+++ b/packages/node/src/lib/http-client.ts
@@ -15,10 +15,10 @@ export interface HTTPFetchFn {
  * @link https://developer.mozilla.org/en-US/docs/Web/API/Request
  */
 export interface HTTPFetchRequest {
-  headers?: Record<string, string>
-  body?: string
-  method?: HTTPClientRequest['method']
-  signal?: any // AbortSignal type does not play nicely with node-fetch
+  headers: Record<string, string>
+  body: string
+  method: HTTPClientRequest['method']
+  signal: any // AbortSignal type does not play nicely with node-fetch
 }
 
 /**
@@ -73,7 +73,16 @@ export interface HTTPClient {
 export class FetchHTTPClient implements HTTPClient {
   private _fetch: HTTPFetchFn
   constructor(fetchFn?: HTTPFetchFn) {
-    this._fetch = fetchFn ?? defaultFetch
+    const _fetch = fetchFn ?? defaultFetch
+    this._fetch = (url: string, requestInit: HTTPFetchRequest) => {
+      if (typeof url !== 'string') {
+        throw new Error('URL must be a string. Received: ' + url)
+      }
+      if (!requestInit.body || typeof requestInit.body !== 'string') {
+        throw new Error('Body must be a string. Received: ' + requestInit.body)
+      }
+      return _fetch(url, requestInit)
+    }
   }
   async makeRequest(options: HTTPClientRequest): Promise<HTTPResponse> {
     const [signal, timeoutId] = abortSignalAfterTimeout(