diff --git a/snippets/objectToQueryString.md b/snippets/objectToQueryString.md
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@@ -0,0 +1,26 @@
+---
+title: objectToQueryString
+tags: utility,object,function,intermediate
+---
+
+Returns a query string generated from the key-value pairs of the given object.
+
+Use `Array.prototype.reduce()` on `Object.entries(queryParameters)` to create the query string.
+Determine the `symbol` to be either `?` or `&` based on the `index` and concatenate `val` to `queryString` only if it's a string.
+Return the `queryString` or an empty string when the `queryParameters` are falsy.
+
+```js
+const objectToQueryString = (queryParameters) => {
+  return queryParameters
+    ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
+        const symbol = index === 0 ? '?' : '&';
+        queryString += (typeof val === "string") ? `${symbol}${key}=${val}` : '';
+        return queryString;
+      }, '')
+    : '';
+};
+```
+
+```js
+objectToQueryString({page: '1', size: "2kg", key: undefined}); // '?page=1&size=2kg'
+```
diff --git a/test/objectToQueryString.test.js b/test/objectToQueryString.test.js
new file mode 100644
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+++ b/test/objectToQueryString.test.js
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+const {objectToQueryString} = require('./_30s.js');
+
+test('objectToQueryString is a Function', () => {
+  expect(objectToQueryString).toBeInstanceOf(Function);
+});
+
+test("{page: '1', size: '2kg', key: '21'} to give '?page=1&size=2kg&key=21'", () => {
+  expect(
+    objectToQueryString({page: '1', size: '2kg', key: '21'})
+  ).toEqual('?page=1&size=2kg&key=21');
+});
+
+test("{page: '1', size: '2kg', key: undefined} to give '?page=1&size=2kg'", () => {
+  expect(
+    objectToQueryString({page: '1', size: '2kg', key: undefined})
+  ).toEqual('?page=1&size=2kg');
+});
+
+test("{} to give ''", () => {
+  expect(
+    objectToQueryString({})
+  ).toEqual('');
+});
+
+test("{page: 1, size: null, key: undefined} to give ''", () => {
+  expect(
+    objectToQueryString({page: 1, size: null, key: undefined})
+  ).toEqual('');
+});