diff --git a/src/auth/database.ts b/src/auth/database.ts
index 5124f5101f..d19cb305b1 100644
--- a/src/auth/database.ts
+++ b/src/auth/database.ts
@@ -155,7 +155,18 @@ export class Database extends BaseAuthAPI {
             initOverrides,
         );
 
-        return JSONApiResponse.fromResponse(response);
+        // Transform the response to ensure id field is always available
+        const jsonResponse = await JSONApiResponse.fromResponse(response);
+
+        if (jsonResponse.data) {
+            const data = jsonResponse.data as any;
+            // Map _id or user_id to id
+            if (!data.id && (data._id || data.user_id)) {
+                data.id = data._id || data.user_id;
+            }
+        }
+
+        return jsonResponse as JSONApiResponse<SignUpResponse>;
     }
 
     /**
diff --git a/tests/auth/database.test.ts b/tests/auth/database.test.ts
index c893119ba7..7b2373afc0 100644
--- a/tests/auth/database.test.ts
+++ b/tests/auth/database.test.ts
@@ -35,6 +35,38 @@ describe("Database", () => {
             });
             expect(data).toEqual({
                 _id: "test-id",
+                id: "test-id",
+                email_verified: false,
+                email,
+            });
+        });
+
+        it("should signup a user when response param for id is 'user_id'", async () => {
+            const database = new Database(opts);
+            const email = "test-email-1@example.com";
+            const { data } = await database.signUp({
+                email,
+                password: PASSWORD,
+                connection: "Username-Password-Authentication",
+            });
+            expect(data).toEqual({
+                user_id: "test-id",
+                id: "test-id",
+                email_verified: false,
+                email,
+            });
+        });
+
+        it("should signup a user when response param for id is 'id'", async () => {
+            const database = new Database(opts);
+            const email = "test-email-2@example.com";
+            const { data } = await database.signUp({
+                email,
+                password: PASSWORD,
+                connection: "Username-Password-Authentication",
+            });
+            expect(data).toEqual({
+                id: "test-id",
                 email_verified: false,
                 email,
             });
diff --git a/tests/auth/fixtures/database.json b/tests/auth/fixtures/database.json
index 39f84c9a6f..a00a4b7ab5 100644
--- a/tests/auth/fixtures/database.json
+++ b/tests/auth/fixtures/database.json
@@ -33,6 +33,40 @@
             "email": "test-email@example.com"
         }
     },
+    {
+        "scope": "https://test-domain.auth0.com",
+        "method": "POST",
+        "path": "/dbconnections/signup",
+        "body": {
+            "client_id": "test-client-id",
+            "email": "test-email-1@example.com",
+            "password": "test-password",
+            "connection": "Username-Password-Authentication"
+        },
+        "status": 200,
+        "response": {
+            "user_id": "test-id",
+            "email_verified": false,
+            "email": "test-email-1@example.com"
+        }
+    },
+    {
+        "scope": "https://test-domain.auth0.com",
+        "method": "POST",
+        "path": "/dbconnections/signup",
+        "body": {
+            "client_id": "test-client-id",
+            "email": "test-email-2@example.com",
+            "password": "test-password",
+            "connection": "Username-Password-Authentication"
+        },
+        "status": 200,
+        "response": {
+            "id": "test-id",
+            "email_verified": false,
+            "email": "test-email-2@example.com"
+        }
+    },
     {
         "scope": "https://test-domain.auth0.com",
         "method": "POST",