diff --git a/src/LanguageServer/Protocol/Microsoft.CodeAnalysis.LanguageServer.Protocol.csproj b/src/LanguageServer/Protocol/Microsoft.CodeAnalysis.LanguageServer.Protocol.csproj
index d7404811a27fc..c85748a90fe20 100644
--- a/src/LanguageServer/Protocol/Microsoft.CodeAnalysis.LanguageServer.Protocol.csproj
+++ b/src/LanguageServer/Protocol/Microsoft.CodeAnalysis.LanguageServer.Protocol.csproj
@@ -38,6 +38,7 @@
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.ExternalAccess.Razor" />
     <!-- Restricted IVT is direct for protocol types only -->
     <RestrictedInternalsVisibleTo Include="Microsoft.CodeAnalysis.Remote.Razor" Namespace="Roslyn.LanguageServer.Protocol" Partner="Razor" Key="$(RazorKey)" />
+    <RestrictedInternalsVisibleTo Include="Microsoft.CodeAnalysis.Razor.Workspaces" Namespace="Roslyn.LanguageServer.Protocol" Partner="Razor" Key="$(RazorKey)" />
     <RestrictedInternalsVisibleTo Include="Microsoft.VisualStudio.LanguageServices.Razor" Namespace="Roslyn.LanguageServer.Protocol" Partner="Razor" Key="$(RazorKey)" />
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.ExternalAccess.Xaml" />
     <!-- Restricted IVT is direct for protocol types only -->
diff --git a/src/Tools/ExternalAccess/Razor/Remote/JsonSerializableDocumentId.cs b/src/Tools/ExternalAccess/Razor/Remote/JsonSerializableDocumentId.cs
new file mode 100644
index 0000000000000..7ba6d956d9f4e
--- /dev/null
+++ b/src/Tools/ExternalAccess/Razor/Remote/JsonSerializableDocumentId.cs
@@ -0,0 +1,27 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.Razor
+{
+    /// <summary>
+    /// Represents a DocumentId that can be used by Razor for OOP services that communicate via System.Text.Json
+    /// </summary>
+    internal readonly record struct JsonSerializableDocumentId(
+        [property: JsonPropertyName("projectId")] Guid ProjectId,
+        [property: JsonPropertyName("id")] Guid Id)
+    {
+        public static implicit operator JsonSerializableDocumentId(DocumentId documentId)
+        {
+            return new JsonSerializableDocumentId(documentId.ProjectId.Id, documentId.Id);
+        }
+
+        public static implicit operator DocumentId(JsonSerializableDocumentId serializableDocumentId)
+        {
+            return DocumentId.CreateFromSerialized(CodeAnalysis.ProjectId.CreateFromSerialized(serializableDocumentId.ProjectId), serializableDocumentId.Id);
+        }
+    }
+}
diff --git a/src/Tools/ExternalAccess/Razor/Remote/JsonSerializableRazorPinnedSolutionInfoWrapper.cs b/src/Tools/ExternalAccess/Razor/Remote/JsonSerializableRazorPinnedSolutionInfoWrapper.cs
new file mode 100644
index 0000000000000..33c57d04c581b
--- /dev/null
+++ b/src/Tools/ExternalAccess/Razor/Remote/JsonSerializableRazorPinnedSolutionInfoWrapper.cs
@@ -0,0 +1,27 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.Razor
+{
+    /// <summary>
+    /// A wrapper for a solution that can be used by Razor for OOP services that communicate via System.Text.Json
+    /// </summary>
+    internal readonly record struct JsonSerializableRazorPinnedSolutionInfoWrapper(
+        [property: JsonPropertyName("data1")] long Data1,
+        [property: JsonPropertyName("data2")] long Data2)
+    {
+        public static implicit operator JsonSerializableRazorPinnedSolutionInfoWrapper(RazorPinnedSolutionInfoWrapper info)
+        {
+            return new JsonSerializableRazorPinnedSolutionInfoWrapper(info.UnderlyingObject.Data1, info.UnderlyingObject.Data2);
+        }
+
+        public static implicit operator RazorPinnedSolutionInfoWrapper(JsonSerializableRazorPinnedSolutionInfoWrapper serializableDocumentId)
+        {
+            return new RazorPinnedSolutionInfoWrapper(new Checksum(serializableDocumentId.Data1, serializableDocumentId.Data2));
+        }
+    }
+}
diff --git a/src/Tools/ExternalAccess/Razor/Remote/RazorPinnedSolutionInfoWrapper.cs b/src/Tools/ExternalAccess/Razor/Remote/RazorPinnedSolutionInfoWrapper.cs
index e98a61d9448e7..eec9f59b0de71 100644
--- a/src/Tools/ExternalAccess/Razor/Remote/RazorPinnedSolutionInfoWrapper.cs
+++ b/src/Tools/ExternalAccess/Razor/Remote/RazorPinnedSolutionInfoWrapper.cs
@@ -3,10 +3,12 @@
 // See the LICENSE file in the project root for more information.
 
 using System.Runtime.Serialization;
-using Microsoft.CodeAnalysis.Remote;
 
 namespace Microsoft.CodeAnalysis.ExternalAccess.Razor
 {
+    /// <summary>
+    /// A wrapper for a solution that can be used by Razor for OOP services that communicate via MessagePack
+    /// </summary>
     [DataContract]
     internal readonly struct RazorPinnedSolutionInfoWrapper
     {
diff --git a/src/Tools/ExternalAccess/Razor/Remote/RazorServiceDescriptorsWrapper.cs b/src/Tools/ExternalAccess/Razor/Remote/RazorServiceDescriptorsWrapper.cs
index 3446e3fd31fc7..902e9645ab1bb 100644
--- a/src/Tools/ExternalAccess/Razor/Remote/RazorServiceDescriptorsWrapper.cs
+++ b/src/Tools/ExternalAccess/Razor/Remote/RazorServiceDescriptorsWrapper.cs
@@ -5,12 +5,13 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
-using System.Runtime;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 using MessagePack;
 using MessagePack.Formatters;
+using Microsoft.CodeAnalysis.LanguageServer;
 using Microsoft.CodeAnalysis.Remote;
 using Microsoft.ServiceHub.Framework;
-using Newtonsoft.Json;
 
 namespace Microsoft.CodeAnalysis.ExternalAccess.Razor
 {
@@ -30,7 +31,7 @@ public RazorServiceDescriptorsWrapper(
             => UnderlyingObject = new ServiceDescriptors(componentName, featureDisplayNameProvider, new RemoteSerializationOptions(additionalFormatters, additionalResolvers), interfaces);
 
         /// <summary>
-        /// Creates a service descriptor set for services using JSON serialization.
+        /// Creates a service descriptor set for services using System.Text.Json serialization.
         /// </summary>
         public RazorServiceDescriptorsWrapper(
             string componentName,
@@ -45,10 +46,11 @@ public RazorServiceDescriptorsWrapper(
         public ServiceJsonRpcDescriptor GetDescriptorForServiceFactory(Type serviceInterface)
             => UnderlyingObject.GetServiceDescriptorForServiceFactory(serviceInterface);
 
-        public MessagePackSerializerOptions MessagePackOptions
-            => UnderlyingObject.Options.MessagePackOptions;
-
-        public ImmutableArray<JsonConverter> JsonConverters
-            => UnderlyingObject.Options.JsonConverters;
+        public static ImmutableArray<JsonConverter> GetLspConverters()
+        {
+            var options = new JsonSerializerOptions();
+            ProtocolConversions.AddLspSerializerOptions(options);
+            return options.Converters.ToImmutableArray();
+        }
     }
 }
diff --git a/src/Workspaces/Remote/Core/RemoteSerializationOptions.cs b/src/Workspaces/Remote/Core/RemoteSerializationOptions.cs
index df1a6c4360fac..24714062b5ed3 100644
--- a/src/Workspaces/Remote/Core/RemoteSerializationOptions.cs
+++ b/src/Workspaces/Remote/Core/RemoteSerializationOptions.cs
@@ -37,11 +37,21 @@ public RemoteSerializationOptions(ImmutableArray<IMessagePackFormatter> addition
         public RemoteSerializationOptions(ImmutableArray<JsonConverter> jsonConverters)
             => _options = jsonConverters;
 
+        public RemoteSerializationOptions(ImmutableArray<System.Text.Json.Serialization.JsonConverter> jsonConverters)
+            => _options = jsonConverters;
+
         public MessagePackSerializerOptions MessagePackOptions => (MessagePackSerializerOptions)_options;
         public ImmutableArray<JsonConverter> JsonConverters => (ImmutableArray<JsonConverter>)_options;
+        public ImmutableArray<System.Text.Json.Serialization.JsonConverter> SystemTextJsonConverters => (ImmutableArray<System.Text.Json.Serialization.JsonConverter>)_options;
 
         public ServiceJsonRpcDescriptor.Formatters Formatter
-            => _options is MessagePackSerializerOptions ? ServiceJsonRpcDescriptor.Formatters.MessagePack : ServiceJsonRpcDescriptor.Formatters.UTF8;
+            => _options switch
+            {
+                MessagePackSerializerOptions => ServiceJsonRpcDescriptor.Formatters.MessagePack,
+                ImmutableArray<JsonConverter> => ServiceJsonRpcDescriptor.Formatters.UTF8,
+                ImmutableArray<System.Text.Json.Serialization.JsonConverter> => ServiceJsonRpcDescriptor.Formatters.UTF8SystemTextJson,
+                _ => throw new InvalidOperationException()
+            };
 
         public ServiceJsonRpcDescriptor.MessageDelimiters MessageDelimiters
            => _options is MessagePackSerializerOptions
@@ -58,6 +68,15 @@ internal IJsonRpcMessageFormatter ConfigureFormatter(IJsonRpcMessageFormatter fo
                 // See https://github.com/neuecc/messagepack-csharp.
                 messagePackFormatter.SetMessagePackSerializerOptions(MessagePackOptions);
             }
+            else if (formatter is SystemTextJsonFormatter stjFormatter)
+            {
+                var converters = stjFormatter.JsonSerializerOptions.Converters;
+
+                foreach (var converter in SystemTextJsonConverters)
+                {
+                    converters.Add(converter);
+                }
+            }
             else
             {
                 var converters = ((JsonMessageFormatter)formatter).JsonSerializer.Converters;