diff --git a/src/formatters/formatCookies.test.ts b/src/formatters/formatCookies.test.ts
new file mode 100644
index 0000000..8d9e993
--- /dev/null
+++ b/src/formatters/formatCookies.test.ts
@@ -0,0 +1,15 @@
+import { describe, expect, test } from "@jest/globals";
+import { formatCookies } from "./formatCookies";
+
+describe("formatCookies", () => {
+  test("should return the same number if test is under a thousand", () => {
+    expect(
+      formatCookies({
+        num: 123,
+        bool: true,
+        string: "string",
+        undef: undefined,
+      })
+    ).toBe(`num=123; bool=true; string=string;`);
+  });
+});
diff --git a/src/formatters/formatCookies.ts b/src/formatters/formatCookies.ts
index 30f065b..76ad810 100644
--- a/src/formatters/formatCookies.ts
+++ b/src/formatters/formatCookies.ts
@@ -3,10 +3,17 @@ import { PlainObject } from "../types/Object";
 /**
  *
  * @example formatCookies({}) => ""
- * @example formatCookies({ session: "123", _ga: 123 }) => "session=123; _ga=123"
+ * @example formatCookies({ session: "123", _ga: 123 }) => "session=123; _ga=123;"
  */
 export const formatCookies = (object: PlainObject): string => {
-  return Object.entries(object)
-    .map(([key, value]) => `${key}=${value}`)
-    .join("; ");
+  return (
+    Object.entries(object)
+      .reduce((acc: string[], [key, value]) => {
+        // allow nulls to be set?
+        if (value !== undefined) acc.push(`${key}=${value}`);
+
+        return acc;
+      }, [])
+      .join("; ") + ";"
+  );
 };
diff --git a/src/helpers/setCookie.ts b/src/helpers/setCookie.ts
new file mode 100644
index 0000000..41eb3cc
--- /dev/null
+++ b/src/helpers/setCookie.ts
@@ -0,0 +1,30 @@
+import { formatCookies } from "../formatters";
+
+/**
+ * Set a client cookie by name, works only in the browser
+ * @param name - required
+ * @param value - required, any value tha can be serialized
+ * @param domain - optional, defailts to current domain
+ * @param maxAgeSeconds - optional, defaults to "Session"
+ */
+export const setCookie = ({
+  domain,
+  maxAgeSeconds,
+  name,
+  value,
+}: {
+  domain?: string;
+  maxAgeSeconds?: number;
+  name: string;
+  value: any;
+}): void => {
+  if (typeof document === "undefined") {
+    return;
+  }
+
+  document.cookie = formatCookies({
+    [name]: value,
+    domain,
+    "max-age": maxAgeSeconds,
+  });
+};