diff --git a/packages/mongoose-filter-query/readme.md b/packages/mongoose-filter-query/readme.md
index d50dc4d..ced2182 100644
--- a/packages/mongoose-filter-query/readme.md
+++ b/packages/mongoose-filter-query/readme.md
@@ -115,12 +115,24 @@ console.log(data);
 
 - This will return all users with a first name of John, Eric or matches the given regular expression<br><br>
 
+```javascript
+"http://localhost:3000/api/users?filter[or]=first_name=eq(John),last_name=eq(Eric)";
+```
+
+- This will return all users with a first name of John or a last name of Eric<br><br>
+
 ```javascript
 "http://localhost:3000/api/users?filter[age]=and(gt(20),lt(30))";
 ```
 
 - This will return all users with an age which is between 20 and 30<br><br>
 
+```javascript
+"http://localhost:3000/api/users?filter[and]=age=gt(20),first_name=eq(John)";
+```
+
+- This will return all users with an age greater than 20 and a first name of John<br><br>
+
 ## Multiple Filters<br><br>
 
 - Multiple filters can be chained together with the use of the & operator<br><br>
diff --git a/packages/mongoose-filter-query/src/index.js b/packages/mongoose-filter-query/src/index.js
index f0f6282..c544ed4 100644
--- a/packages/mongoose-filter-query/src/index.js
+++ b/packages/mongoose-filter-query/src/index.js
@@ -1,26 +1,9 @@
-import { mapValue, replaceOperator } from "./utils";
-
-const complexOperators = ["and", "or"];
+import { mapFilters } from "./utils";
 
 const mongooseFilterQuery = (req, res, next) => {
   try {
-    if (req.query.filter) {
-      Object.keys(req.query.filter).forEach((key) => {
-        const value = req.query.filter[key];
-        const complexOp = complexOperators.find((op) => value.startsWith(`${op}(`));
-        if (complexOp) {
-          const values = replaceOperator(value, complexOp)?.split(",");
-          req.query.filter[`$${complexOp}`] = values.map((subValue) => ({
-            [key]: mapValue(subValue)
-          }));
-          delete req.query.filter[key];
-        } else {
-          req.query.filter[key] = mapValue(value);
-        }
-      });
-    } else {
-      req.query.filter = {};
-    }
+    req.query.filter = mapFilters(req.query.filter) ?? {}
+    mapFilters(req.query.secondaryFilter)
     if (req.query.sort) {
       Object.keys(req.query.sort).forEach((key) => {
         const dir = req.query.sort[key];
diff --git a/packages/mongoose-filter-query/src/utils.js b/packages/mongoose-filter-query/src/utils.js
index cbddc05..45e9e46 100644
--- a/packages/mongoose-filter-query/src/utils.js
+++ b/packages/mongoose-filter-query/src/utils.js
@@ -1,3 +1,5 @@
+const complexOperators = ["and", "or"];
+
 export const replaceOperator = (value, operator) => {
   value = value.replace(`${operator}(`, "").slice(0, -1);
   if (isNaN(value)) {
@@ -38,3 +40,30 @@ export const mapValue = (value) => {
   }
   return value;
 };
+
+export const mapFilters = (filter = {}) => {
+  if (filter) {
+    Object.keys(filter).forEach((key) => {
+      const value = filter[key];
+      if (complexOperators.includes(key)) {
+        filter[`$${key}`] = value.split(",").map((kv) => {
+          const [key, value] = kv.split("=")
+          return { [key]: mapValue(value) }
+        })
+        delete filter[key]
+      } else {
+        const complexOp = complexOperators.find((op) => value.startsWith(`${op}(`));
+        if (complexOp) {
+          const values = replaceOperator(value, complexOp)?.split(",");
+          filter[`$${complexOp}`] = values.map((subValue) => ({
+            [key]: mapValue(subValue)
+          }));
+          delete filter[key];
+        } else {
+          filter[key] = mapValue(value);
+        }
+      }
+    });
+  }
+  return filter;
+}
\ No newline at end of file
diff --git a/packages/mongoose-filter-query/test/__mocks.js b/packages/mongoose-filter-query/test/__mocks.js
index 8e2f0c0..d10205b 100644
--- a/packages/mongoose-filter-query/test/__mocks.js
+++ b/packages/mongoose-filter-query/test/__mocks.js
@@ -46,6 +46,20 @@ export const complexFilterResult = {
   $or: [{ lastName: { $eq: "Doe" } }, { lastName: { $ne: "John" } }]
 };
 
+export const complexRootKeyFilterReq = {
+  query: {
+    filter: {
+      or: "firstName=eq(John),lastName=eq(Doe)",
+      and: "age=gt(20),firstName=eq(John)"
+    }
+  }
+};
+
+export const complexRootKeyFilterResult = {
+  $or: [{ firstName: { $eq: "John" } }, { lastName: { $eq: "Doe" } }],
+  $and: [{ age: { $gt: 20 } }, { firstName: { $eq: "John" } }],
+};
+
 export const sortsReq = {
   query: {
     sort: {
diff --git a/packages/mongoose-filter-query/test/index.test.js b/packages/mongoose-filter-query/test/index.test.js
index d19eb7c..43c57d9 100644
--- a/packages/mongoose-filter-query/test/index.test.js
+++ b/packages/mongoose-filter-query/test/index.test.js
@@ -5,6 +5,8 @@ import {
   basicFilterResult,
   complexFilterReq,
   complexFilterResult,
+  complexRootKeyFilterReq,
+  complexRootKeyFilterResult,
   sortsReq,
   sortResult,
   includeReq,
@@ -24,6 +26,10 @@ describe("test mongoose-filter-query", () => {
       mongooseFilterQuery(complexFilterReq, {}, () => {});
       expect(complexFilterReq.query.filter).toEqual(complexFilterResult);
     });
+    test("complex as root key", async () => {
+      mongooseFilterQuery(complexRootKeyFilterReq, {}, () => {});
+      expect(complexRootKeyFilterReq.query.filter).toEqual(complexRootKeyFilterResult);
+    });
     test("undefined", async () => {
       mongooseFilterQuery(sortsReq, {}, () => {});
       expect(sortsReq.query.filter).toEqual({});