diff --git a/README.md b/README.md
index fe57af8a..7fada804 100644
--- a/README.md
+++ b/README.md
@@ -189,6 +189,7 @@ ahoy.configure({
   cookieDomain: null,
   headers: {},
   visitParams: {},
+  beforeSend: null,
   withCredentials: false,
   visitDuration: 4 * 60, // 4 hours
   visitorDuration: 2 * 365 * 24 * 60 // 2 years
diff --git a/src/index.js b/src/index.js
index 4421da36..c9e10397 100644
--- a/src/index.js
+++ b/src/index.js
@@ -13,6 +13,7 @@ let config = {
   cookieDomain: null,
   headers: {},
   visitParams: {},
+  beforeSend: null,
   withCredentials: false,
   visitDuration: 4 * 60, // default 4 hours
   visitorDuration: 2 * 365 * 24 * 60 // default 2 years
@@ -170,16 +171,22 @@ function CSRFProtection(xhr) {
   if (token) xhr.setRequestHeader("X-CSRF-Token", token);
 }
 
+function beforeSend(xhr, settings) {
+  CSRFProtection(xhr);
+  if (config.beforeSend) config.beforeSend(xhr, settings);
+}
+
 function sendRequest(url, data, success) {
+  let requestData = JSON.stringify(data);
   if (canStringify) {
     if ($ && $.ajax) {
       $.ajax({
         type: "POST",
         url: url,
-        data: JSON.stringify(data),
+        data: requestData,
         contentType: "application/json; charset=utf-8",
         dataType: "json",
-        beforeSend: CSRFProtection,
+        beforeSend: beforeSend,
         success: success,
         headers: config.headers,
         xhrFields: {
@@ -201,8 +208,8 @@ function sendRequest(url, data, success) {
           success();
         }
       };
-      CSRFProtection(xhr);
-      xhr.send(JSON.stringify(data));
+      beforeSend(xhr, { data: requestData });
+      xhr.send(requestData);
     }
   }
 }