diff --git a/src/hosting-node.js b/src/hosting-node.js
index 9ab4d40..c1baa88 100644
--- a/src/hosting-node.js
+++ b/src/hosting-node.js
@@ -53,7 +53,7 @@ async function getBody(url, userAgentIdentifier) {
  * Check if a domain is hosted by a green web host.
  * @param {string|array} domain - The domain to check, or an array of domains to be checked.
  * @param {string[] | DomainCheckOptions} optionsOrDb - Optional. An object of domain check options, or a database list to use for lookups.
- * @param {string | DomainCheckOptions} optionsOrAgentId - Optional. An object of domain check options, or a string
+ * @param {string | DomainCheckOptions} userAgentIdentifier - Optional. An object of domain check options, or a string
  *   representing the app, site, or organisation that is making the request.
  * @returns - A boolean if a string was provided, or an array of booleans if an array of domains was provided.
  *   if a string was provided for `domain`: a boolean indicating whether the domain is hosted by a green web host if `options.verbose` is false,
@@ -62,19 +62,18 @@ async function getBody(url, userAgentIdentifier) {
  *     otherwise a dictionary of domain to host information.
  */
 
-function check(domain, optionsOrDb, optionsOrAgentId) {
-  let db, options;
-  if (!db || Array.isArray(optionsOrDb)) {
+function check(domain, optionsOrDb, userAgentIdentifier) {
+  let db,
+    options = {};
+  if (!db && Array.isArray(optionsOrDb)) {
     db = optionsOrDb;
-    options =
-      typeof optionsOrAgentId === "string"
-        ? { userAgentIdentifier: optionsOrAgentId }
-        : optionsOrAgentId;
   } else {
     options = optionsOrDb;
-    db = optionsOrDb.db;
+    db = optionsOrDb?.db;
   }
 
+  console.log({ db, options });
+
   if (db && options?.verbose) {
     throw new Error("verbose mode cannot be used with a local lookup database");
   }
diff --git a/src/hosting.test.js b/src/hosting.test.js
index 9bb2b67..9ec326b 100644
--- a/src/hosting.test.js
+++ b/src/hosting.test.js
@@ -66,7 +66,7 @@ describe("hosting", () => {
       expect(res).toEqual(true);
     });
     it("use the API instead with verbose=true", async () => {
-      const res = await hosting.check("google.com", null, {
+      const res = await hosting.check("google.com", {
         verbose: true,
       });
       expect(res).toMatchObject({
@@ -77,7 +77,9 @@ describe("hosting", () => {
       });
     });
     it("sets the correct user agent header", async () => {
-      await hosting.check("google.com", null, requestHeaderComment);
+      await hosting.check("google.com", {
+        userAgentIdentifier: requestHeaderComment,
+      });
       expect(httpsGetSpy).toHaveBeenCalledTimes(1);
       expect(httpsGetSpy).toHaveBeenLastCalledWith(
         expect.any(String),
@@ -95,7 +97,7 @@ describe("hosting", () => {
     });
 
     it("use the API with verbose=true", async () => {
-      const res = await hosting.check(["google.com", "pchome.com"], null, {
+      const res = await hosting.check(["google.com", "pchome.com"], {
         verbose: true,
       });
       expect(res).toEqual({