diff --git a/CefSharp.OutOfProcess.BrowserProcess/BrowserProcessHandler.cs b/CefSharp.OutOfProcess.BrowserProcess/BrowserProcessHandler.cs
index 476650d..2d48a07 100644
--- a/CefSharp.OutOfProcess.BrowserProcess/BrowserProcessHandler.cs
+++ b/CefSharp.OutOfProcess.BrowserProcess/BrowserProcessHandler.cs
@@ -42,6 +42,7 @@ protected override void OnContextInitialized()
             _outOfProcessServer.NotifyContextInitialized(threadId, Cef.CefSharpVersion, Cef.CefVersion, Cef.ChromiumVersion);
             _outOfProcessServer.BeforeDownloadCallback += _outOfProcessServer_BeforeDownloadCallback;
             _outOfProcessServer.DownloadCallback += _outOfProcessServer_DownloadCallback;
+            _outOfProcessServer.JsDialogCallback += _outOfProcessServer_JsDialogCallback;
         }
 
         private void _outOfProcessServer_DownloadCallback(object sender, DownloadCallbackDetails e)
@@ -54,6 +55,11 @@ private void _outOfProcessServer_BeforeDownloadCallback(object sender, BeforeDow
             ((DownloadHandlerProxy)GetBrowser(e.BrowserId).DownloadHandler)?.BeforeDownloadCallback(e);
         }
 
+        private void _outOfProcessServer_JsDialogCallback(object sender, JsDialogCallbackDetails e)
+        {
+            ((JsDialogHandlerProxy)GetBrowser(e.BrowserId).JsDialogHandler)?.Callback(e);
+        }
+
         private OutOfProcessChromiumWebBrowser GetBrowser(int id) => _browsers.FirstOrDefault(x => x.Id == id);
 
         protected override void Dispose(bool disposing)
diff --git a/CefSharp.OutOfProcess.BrowserProcess/CallbackProxies/JsDialogHandlerProxy.cs b/CefSharp.OutOfProcess.BrowserProcess/CallbackProxies/JsDialogHandlerProxy.cs
new file mode 100644
index 0000000..bb13baf
--- /dev/null
+++ b/CefSharp.OutOfProcess.BrowserProcess/CallbackProxies/JsDialogHandlerProxy.cs
@@ -0,0 +1,56 @@
+using CefSharp.OutOfProcess.Interface;
+using CefSharp.OutOfProcess.Interface.Callbacks;
+using System;
+
+namespace CefSharp.OutOfProcess.BrowserProcess.CallbackProxies
+{
+    internal sealed class JsDialogHandlerProxy : CallbackProxyBase<object>, IJsDialogHandler
+    {
+        public JsDialogHandlerProxy(IOutOfProcessHostRpc host)
+            : base(host)
+        {
+
+        }
+
+        public void Callback(JsDialogCallbackDetails details)
+        {
+            var cb = (CefSharp.OutOfProcess.Interface.Callbacks.IJsDialogCallback)GetCallback(details.CallbackId);
+
+            if (details.UserInput != string.Empty)
+            {
+                cb.Continue(details.Success, details.UserInput);
+            }
+            else
+            {
+                cb.Continue(details.Success);
+            }
+        }
+
+        public bool OnBeforeUnloadDialog(IWebBrowser chromiumWebBrowser, IBrowser browser, string messageText, bool isReload, IJsDialogCallback callback)
+        {
+            var result = host.OnBeforeUnloadDialog(((OutOfProcessChromiumWebBrowser)chromiumWebBrowser).Id, messageText, isReload, CreateCallback(callback));
+            return result;
+        }
+
+        public void OnDialogClosed(IWebBrowser chromiumWebBrowser, IBrowser browser)
+        {
+            host.OnDialogClosed(((OutOfProcessChromiumWebBrowser)chromiumWebBrowser).Id);
+        }
+
+        public bool OnJSDialog(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, CefJsDialogType dialogType, string messageText, string defaultPromptText, IJsDialogCallback callback, ref bool suppressMessage)
+        {
+            var result = host.OnJSDialog(((OutOfProcessChromiumWebBrowser)chromiumWebBrowser).Id, originUrl, ParseEnum<Interface.Callbacks.CefJsDialogType>(Enum.GetName(typeof(CefJsDialogType), dialogType)), messageText, defaultPromptText, CreateCallback(callback), ref suppressMessage);
+            return result;
+        }
+
+        public void OnResetDialogState(IWebBrowser chromiumWebBrowser, IBrowser browser)
+        {
+            host.OnResetDialogState(((OutOfProcessChromiumWebBrowser)chromiumWebBrowser).Id);
+        }
+
+        public static T ParseEnum<T>(string value)
+        {
+            return (T)Enum.Parse(typeof(T), value, true);
+        }
+    }
+}
\ No newline at end of file
diff --git a/CefSharp.OutOfProcess.Core/CallbackProxies/JsDialogCallbackProxy.cs b/CefSharp.OutOfProcess.Core/CallbackProxies/JsDialogCallbackProxy.cs
new file mode 100644
index 0000000..7af23ac
--- /dev/null
+++ b/CefSharp.OutOfProcess.Core/CallbackProxies/JsDialogCallbackProxy.cs
@@ -0,0 +1,34 @@
+namespace CefSharp.OutOfProcess
+{
+    using CefSharp.OutOfProcess.Interface.Callbacks;
+    using CefSharp.OutOfProcess.Internal;
+
+    internal sealed class JsDialogCallbackProxy : CallbackProxyBase, IJsDialogCallback
+    {
+        public JsDialogCallbackProxy(OutOfProcessHost outOfProcessHost, int callback, IChromiumWebBrowserInternal chromiumWebBrowser)
+            : base(outOfProcessHost, callback, chromiumWebBrowser)
+        {
+        }
+
+        void IJsDialogCallback.Continue(bool success, string userInput)
+        {
+            outOfProcessHost.InvokeJsDialogCallback(new JsDialogCallbackDetails()
+            {
+                CallbackId = callback,
+                BrowserId = chromiumWebBrowser.Id,
+                Success = success,
+                UserInput = userInput,
+            });
+        }
+
+        void IJsDialogCallback.Continue(bool success)
+        {
+            outOfProcessHost.InvokeJsDialogCallback(new JsDialogCallbackDetails()
+            {
+                CallbackId = callback,
+                BrowserId = chromiumWebBrowser.Id,
+                Success = success,
+            });
+        }
+    }
+}
\ No newline at end of file
diff --git a/CefSharp.OutOfProcess.Core/Handler/IJsDialogHandler.cs b/CefSharp.OutOfProcess.Core/Handler/IJsDialogHandler.cs
new file mode 100644
index 0000000..b224c67
--- /dev/null
+++ b/CefSharp.OutOfProcess.Core/Handler/IJsDialogHandler.cs
@@ -0,0 +1,16 @@
+namespace CefSharp.OutOfProcess.Handler
+{
+    using CefSharp.OutOfProcess.Interface.Callbacks;
+    
+    public interface IJsDialogHandler
+    {
+
+        bool OnJSDialog(IChromiumWebBrowser chromiumWebBrowser, string originUrl, CefJsDialogType dialogType, string messageText, string defaultPromptText, IJsDialogCallback callback, ref bool suppressMessage);
+
+        bool OnBeforeUnloadDialog(IChromiumWebBrowser chromiumWebBrowser, string messageText, bool isReload, IJsDialogCallback callback);
+
+        void OnResetDialogState(IChromiumWebBrowser chromiumWebBrowser);
+
+        void OnDialogClosed(IChromiumWebBrowser chromiumWebBrowser);
+    }
+}
\ No newline at end of file
diff --git a/CefSharp.OutOfProcess.Core/IChromiumWebBrowser.cs b/CefSharp.OutOfProcess.Core/IChromiumWebBrowser.cs
index a3d7d7a..1fb4b18 100644
--- a/CefSharp.OutOfProcess.Core/IChromiumWebBrowser.cs
+++ b/CefSharp.OutOfProcess.Core/IChromiumWebBrowser.cs
@@ -205,5 +205,7 @@ public interface IChromiumWebBrowser : IDisposable
         Task<Response> GoForwardAsync(NavigationOptions options = null);
 
         Handler.IDownloadHandler DownloadHandler { get; set; }
+
+        Handler.IJsDialogHandler JsDialogHandler { get; set; }
     }
 }
diff --git a/CefSharp.OutOfProcess.Core/OutOfProcessHost.cs b/CefSharp.OutOfProcess.Core/OutOfProcessHost.cs
index 8880188..960ca67 100644
--- a/CefSharp.OutOfProcess.Core/OutOfProcessHost.cs
+++ b/CefSharp.OutOfProcess.Core/OutOfProcessHost.cs
@@ -42,6 +42,8 @@ private OutOfProcessHost(string outOfProcessHostExePath, string cachePath = null
 
         public event EventHandler<BeforeDownloadCallbackDetails> BeforeDownloadCallback;
 
+        public event EventHandler<JsDialogCallbackDetails> JsDialogCallback;
+
 
         /// <summary>
         /// UI Thread assocuated with this <see cref="OutOfProcessHost"/>
@@ -287,5 +289,43 @@ Task<bool> IOutOfProcessHostRpc.OnCanDownloadAsync(int browserId, string url, st
         internal void InvokeBeforeDownloadCallback(BeforeDownloadCallbackDetails callbackDetails) => BeforeDownloadCallback.Invoke(this, callbackDetails);
 
         internal void InvokeDownloadCallback(DownloadCallbackDetails callbackDetails) => DownloadCallback.Invoke(this, callbackDetails);
+
+        internal void InvokeJsDialogCallback(JsDialogCallbackDetails callbackDetails) => JsDialogCallback.Invoke(this, callbackDetails);
+
+        public bool OnBeforeUnloadDialog(int browserId, string messageText, bool isReload, int callback)
+        {
+            if (GetBrowser(browserId) is IChromiumWebBrowserInternal chromiumWebBrowser)
+            {
+                return chromiumWebBrowser?.JsDialogHandler?.OnBeforeUnloadDialog(chromiumWebBrowser, messageText, isReload, new JsDialogCallbackProxy(this, callback, chromiumWebBrowser)) ?? false;
+            }
+
+            return false;
+        }
+
+        public void OnDialogClosed(int browserId)
+        {
+            if (GetBrowser(browserId) is IChromiumWebBrowserInternal chromiumWebBrowser)
+            {
+                chromiumWebBrowser?.JsDialogHandler?.OnDialogClosed(chromiumWebBrowser);
+            }
+        }
+
+        public bool OnJSDialog(int browserId, string originUrl, CefJsDialogType dialogType, string messageText, string defaultPromptText, int callback, ref bool suppressMessage)
+        {
+            if (GetBrowser(browserId) is IChromiumWebBrowserInternal chromiumWebBrowser)
+            {
+                return chromiumWebBrowser?.JsDialogHandler?.OnJSDialog(chromiumWebBrowser,originUrl, dialogType, messageText,defaultPromptText,new JsDialogCallbackProxy(this, callback,chromiumWebBrowser), ref suppressMessage) ?? false;
+            }
+
+            return false;
+        }
+
+        public void OnResetDialogState(int browserId)
+        {
+            if (GetBrowser(browserId) is IChromiumWebBrowserInternal chromiumWebBrowser)
+            {
+                chromiumWebBrowser?.JsDialogHandler?.OnResetDialogState(chromiumWebBrowser);
+            }
+        }
     }
 }
diff --git a/CefSharp.OutOfProcess.Interface/Callbacks/CefJSDialogType.cs b/CefSharp.OutOfProcess.Interface/Callbacks/CefJSDialogType.cs
new file mode 100644
index 0000000..a092c35
--- /dev/null
+++ b/CefSharp.OutOfProcess.Interface/Callbacks/CefJSDialogType.cs
@@ -0,0 +1,21 @@
+namespace CefSharp.OutOfProcess.Interface.Callbacks
+{
+    /// <summary>
+    /// Supported JavaScript dialog types.
+    /// </summary>
+    public enum CefJsDialogType
+    {
+        /// <summary>
+        /// Alert Dialog
+        /// </summary>
+        Alert = 0,
+        /// <summary>
+        /// Confirm Dialog
+        /// </summary>
+        Confirm,
+        /// <summary>
+        /// Prompt Dialog
+        /// </summary>
+        Prompt
+    }
+}
\ No newline at end of file
diff --git a/CefSharp.OutOfProcess.Interface/Callbacks/IJsDialogCallback.cs b/CefSharp.OutOfProcess.Interface/Callbacks/IJsDialogCallback.cs
new file mode 100644
index 0000000..02f7bcd
--- /dev/null
+++ b/CefSharp.OutOfProcess.Interface/Callbacks/IJsDialogCallback.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace CefSharp.OutOfProcess.Interface.Callbacks
+{
+    public interface IJsDialogCallback : IDisposable
+    {
+        bool IsDisposed { get; }
+        void Continue(bool success);
+        void Continue(bool success, string userInput);
+    }
+}
diff --git a/CefSharp.OutOfProcess.Interface/Callbacks/JsDialogCallbackDetails.cs b/CefSharp.OutOfProcess.Interface/Callbacks/JsDialogCallbackDetails.cs
new file mode 100644
index 0000000..1008dd6
--- /dev/null
+++ b/CefSharp.OutOfProcess.Interface/Callbacks/JsDialogCallbackDetails.cs
@@ -0,0 +1,9 @@
+namespace CefSharp.OutOfProcess.Interface.Callbacks
+{
+    public class JsDialogCallbackDetails : CallbackDetails
+    {
+        public string UserInput { get; set; }
+
+        public bool Success { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/CefSharp.OutOfProcess.Interface/IOutOfProcessHostRpc.cs b/CefSharp.OutOfProcess.Interface/IOutOfProcessHostRpc.cs
index 8388020..b630a96 100644
--- a/CefSharp.OutOfProcess.Interface/IOutOfProcessHostRpc.cs
+++ b/CefSharp.OutOfProcess.Interface/IOutOfProcessHostRpc.cs
@@ -89,5 +89,14 @@ public interface IOutOfProcessHostRpc
 
         event EventHandler<BeforeDownloadCallbackDetails> BeforeDownloadCallback;
         event EventHandler<DownloadCallbackDetails> DownloadCallback;
+        event EventHandler<JsDialogCallbackDetails> JsDialogCallback;
+
+        bool OnBeforeUnloadDialog(int browserId, string messageText, bool isReload, int callback);
+
+        void OnDialogClosed(int browserId);
+
+        bool OnJSDialog(int browserId, string originUrl, CefJsDialogType dialogType, string messageText, string defaultPromptText, int callback, ref bool suppressMessage);
+
+        void OnResetDialogState(int browserId);
     }
 }
diff --git a/CefSharp.OutOfProcess.WinForms/ChromiumWebBrowser.cs b/CefSharp.OutOfProcess.WinForms/ChromiumWebBrowser.cs
index 282af83..11f1bc6 100644
--- a/CefSharp.OutOfProcess.WinForms/ChromiumWebBrowser.cs
+++ b/CefSharp.OutOfProcess.WinForms/ChromiumWebBrowser.cs
@@ -123,6 +123,8 @@ public IDevToolsContext DevToolsContext
 
         Handler.IDownloadHandler IChromiumWebBrowser.DownloadHandler { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
 
+        Handler.IJsDialogHandler IChromiumWebBrowser.JsDialogHandler { get; set; }
+
         /// <inheritdoc/>
         protected override void OnHandleCreated(EventArgs e)
         {
diff --git a/CefSharp.OutOfProcess.Wpf.HwndHost/ChromiumWebBrowser.cs b/CefSharp.OutOfProcess.Wpf.HwndHost/ChromiumWebBrowser.cs
index 58dd793..a2eb2f1 100644
--- a/CefSharp.OutOfProcess.Wpf.HwndHost/ChromiumWebBrowser.cs
+++ b/CefSharp.OutOfProcess.Wpf.HwndHost/ChromiumWebBrowser.cs
@@ -1066,6 +1066,9 @@ public IChromiumWebBrowser WebBrowser
 
         Handler.IDownloadHandler IChromiumWebBrowser.DownloadHandler { get; set; }
 
+
+        Handler.IJsDialogHandler IChromiumWebBrowser.JsDialogHandler { get; set; }
+
         /// <summary>
         /// The WebBrowser property
         /// </summary>