diff --git a/src/WireMock.Net/Owin/MappingMatcher.cs b/src/WireMock.Net/Owin/MappingMatcher.cs
index 230fe4d4..bc3342a8 100644
--- a/src/WireMock.Net/Owin/MappingMatcher.cs
+++ b/src/WireMock.Net/Owin/MappingMatcher.cs
@@ -35,11 +35,7 @@ internal class MappingMatcher : IMappingMatcher
             {
                 var nextState = GetNextState(mapping);
 
-                var mappingMatcherResult = new MappingMatcherResult
-                {
-                    Mapping = mapping,
-                    RequestMatchResult = mapping.GetRequestMatchResult(request, nextState)
-                };
+                var mappingMatcherResult = new MappingMatcherResult(mapping, mapping.GetRequestMatchResult(request, nextState));
 
                 var exceptions = mappingMatcherResult.RequestMatchResult.MatchDetails
                     .Where(md => md.Exception != null)
@@ -66,7 +62,10 @@ internal class MappingMatcher : IMappingMatcher
 
         var partialMappings = possibleMappings
             .Where(pm => (pm.Mapping.IsAdminInterface && pm.RequestMatchResult.IsPerfectMatch) || !pm.Mapping.IsAdminInterface)
-            .OrderBy(m => m.RequestMatchResult).ThenBy(m => m.Mapping.Priority).ThenByDescending(m => m.Mapping.UpdatedAt)
+            .OrderBy(m => m.RequestMatchResult)
+                .ThenBy(m => m.RequestMatchResult.TotalNumber)
+                .ThenBy(m => m.Mapping.Priority)
+                .ThenByDescending(m => m.Mapping.UpdatedAt)
             .ToList();
         var partialMatch = partialMappings.FirstOrDefault(pm => pm.RequestMatchResult.AverageTotalScore > 0.0);
 
diff --git a/src/WireMock.Net/Owin/MappingMatcherResult.cs b/src/WireMock.Net/Owin/MappingMatcherResult.cs
index 34448303..848a69bb 100644
--- a/src/WireMock.Net/Owin/MappingMatcherResult.cs
+++ b/src/WireMock.Net/Owin/MappingMatcherResult.cs
@@ -1,10 +1,17 @@
+using Stef.Validation;
 using WireMock.Matchers.Request;
 
 namespace WireMock.Owin;
 
 internal class MappingMatcherResult
 {
-    public IMapping Mapping { get; set; }
+    public IMapping Mapping { get; }
 
-    public IRequestMatchResult RequestMatchResult { get; set; }
+    public IRequestMatchResult RequestMatchResult { get; }
+
+    public MappingMatcherResult(IMapping mapping, IRequestMatchResult requestMatchResult)
+    {
+        Mapping = Guard.NotNull(mapping);
+        RequestMatchResult = Guard.NotNull(requestMatchResult);
+    }
 }
\ No newline at end of file
diff --git a/src/WireMock.Net/Server/IRespondWithAProvider.cs b/src/WireMock.Net/Server/IRespondWithAProvider.cs
index b62840b5..ea3bec77 100644
--- a/src/WireMock.Net/Server/IRespondWithAProvider.cs
+++ b/src/WireMock.Net/Server/IRespondWithAProvider.cs
@@ -61,7 +61,7 @@ public interface IRespondWithAProvider
     /// <summary>
     /// Define the priority for this mapping.
     /// </summary>
-    /// <param name="priority">The priority.</param>
+    /// <param name="priority">The priority. (A lower value means a higher priority.)</param>
     /// <returns>The <see cref="IRespondWithAProvider"/>.</returns>
     IRespondWithAProvider AtPriority(int priority);
 
diff --git a/test/WireMock.Net.Tests/Owin/WireMockMiddlewareTests.cs b/test/WireMock.Net.Tests/Owin/WireMockMiddlewareTests.cs
index 7bd2913f..b7e85b89 100644
--- a/test/WireMock.Net.Tests/Owin/WireMockMiddlewareTests.cs
+++ b/test/WireMock.Net.Tests/Owin/WireMockMiddlewareTests.cs
@@ -16,6 +16,7 @@ using WireMock.Admin.Requests;
 using WireMock.Settings;
 using FluentAssertions;
 using WireMock.Handlers;
+using WireMock.Matchers.Request;
 using WireMock.ResponseBuilders;
 using WireMock.RequestBuilders;
 #if NET452
@@ -43,6 +44,7 @@ public class WireMockMiddlewareTests
     private readonly Mock<IOwinResponseMapper> _responseMapperMock;
     private readonly Mock<IMappingMatcher> _matcherMock;
     private readonly Mock<IMapping> _mappingMock;
+    private readonly Mock<IRequestMatchResult> _requestMatchResultMock;
     private readonly Mock<IContext> _contextMock;
 
     private readonly WireMockMiddleware _sut;
@@ -72,12 +74,16 @@ public class WireMockMiddlewareTests
 
         _matcherMock = new Mock<IMappingMatcher>();
         _matcherMock.SetupAllProperties();
-        _matcherMock.Setup(m => m.FindBestMatch(It.IsAny<RequestMessage>())).Returns((new MappingMatcherResult(), new MappingMatcherResult()));
+        // _matcherMock.Setup(m => m.FindBestMatch(It.IsAny<RequestMessage>())).Returns((new MappingMatcherResult(), new MappingMatcherResult()));
 
         _contextMock = new Mock<IContext>();
 
         _mappingMock = new Mock<IMapping>();
 
+        _requestMatchResultMock = new Mock<IRequestMatchResult>();
+        _requestMatchResultMock.Setup(r => r.TotalNumber).Returns(1);
+        _requestMatchResultMock.Setup(r => r.MatchDetails).Returns(new List<MatchDetail>());
+
         _sut = new WireMockMiddleware(
             null,
             _optionsMock.Object,
@@ -133,7 +139,7 @@ public class WireMockMiddlewareTests
         _optionsMock.SetupGet(o => o.AuthenticationMatcher).Returns(new ExactMatcher());
         _mappingMock.SetupGet(m => m.IsAdminInterface).Returns(true);
 
-        var result = new MappingMatcherResult { Mapping = _mappingMock.Object };
+        var result = new MappingMatcherResult(_mappingMock.Object, _requestMatchResultMock.Object);
         _matcherMock.Setup(m => m.FindBestMatch(It.IsAny<RequestMessage>())).Returns((result, result));
 
         // Act
@@ -156,7 +162,7 @@ public class WireMockMiddlewareTests
         _optionsMock.SetupGet(o => o.AuthenticationMatcher).Returns(new ExactMatcher());
         _mappingMock.SetupGet(m => m.IsAdminInterface).Returns(true);
 
-        var result = new MappingMatcherResult { Mapping = _mappingMock.Object };
+        var result = new MappingMatcherResult(_mappingMock.Object, _requestMatchResultMock.Object);
         _matcherMock.Setup(m => m.FindBestMatch(It.IsAny<RequestMessage>())).Returns((result, result));
 
         // Act
@@ -216,7 +222,7 @@ public class WireMockMiddlewareTests
         var requestBuilder = Request.Create().UsingAnyMethod();
         _mappingMock.SetupGet(m => m.RequestMatcher).Returns(requestBuilder);
 
-        var result = new MappingMatcherResult { Mapping = _mappingMock.Object };
+        var result = new MappingMatcherResult(_mappingMock.Object, _requestMatchResultMock.Object);
         _matcherMock.Setup(m => m.FindBestMatch(It.IsAny<RequestMessage>())).Returns((result, result));
 
         // Act
@@ -270,7 +276,7 @@ public class WireMockMiddlewareTests
         var requestBuilder = Request.Create().UsingAnyMethod();
         _mappingMock.SetupGet(m => m.RequestMatcher).Returns(requestBuilder);
 
-        var result = new MappingMatcherResult { Mapping = _mappingMock.Object };
+        var result = new MappingMatcherResult (_mappingMock.Object, _requestMatchResultMock.Object);
         _matcherMock.Setup(m => m.FindBestMatch(It.IsAny<RequestMessage>())).Returns((result, result));
 
         // Act
diff --git a/test/WireMock.Net.Tests/RequestMatchers/RequestMessageBodyMatcherTests.cs b/test/WireMock.Net.Tests/RequestMatchers/RequestMessageBodyMatcherTests.cs
index 26812d12..7fa47186 100644
--- a/test/WireMock.Net.Tests/RequestMatchers/RequestMessageBodyMatcherTests.cs
+++ b/test/WireMock.Net.Tests/RequestMatchers/RequestMessageBodyMatcherTests.cs
@@ -300,6 +300,31 @@ public class RequestMessageBodyMatcherTests
         Check.That(score).IsEqualTo(1.0d);
     }
 
+    [Fact]
+    public void RequestMessageBodyMatcher_GetMatchingScore_BodyAsJson_JmesPathMatchers()
+    {
+        // Arrange
+        var body = new BodyData
+        {
+            BodyAsJson = new { requestId = "1", value = "A" },
+            DetectedBodyType = BodyType.Json
+        };
+
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost"), "GET", "127.0.0.1", body);
+
+        var jmesMatcher1 = new JmesPathMatcher("requestId == '1'");
+        var jmesMatcher2 = new JmesPathMatcher("value == 'A'");
+
+        var bodyMatcher = new RequestMessageBodyMatcher(MatchOperator.And, jmesMatcher1, jmesMatcher2);
+
+        // Act
+        var result = new RequestMatchResult();
+        double score = bodyMatcher.GetMatchingScore(requestMessage, result);
+
+        // Assert
+        score.Should().Be(MatchScores.Perfect);
+    }
+
     [Theory]
     [InlineData(null, 0.0)]
     [InlineData(new byte[0], 0.0)]
diff --git a/test/WireMock.Net.Tests/Util/StringUtilsTests.cs b/test/WireMock.Net.Tests/Util/StringUtilsTests.cs
index 4a9ca6c9..657dd369 100644
--- a/test/WireMock.Net.Tests/Util/StringUtilsTests.cs
+++ b/test/WireMock.Net.Tests/Util/StringUtilsTests.cs
@@ -1,4 +1,5 @@
 using FluentAssertions;
+using WireMock.Matchers;
 using WireMock.Util;
 using Xunit;
 
@@ -6,13 +7,39 @@ namespace WireMock.Net.Tests.Util;
 
 public class StringUtilsTests
 {
+    [Theory]
+    [InlineData("And", MatchOperator.And)]
+    [InlineData("Or", MatchOperator.Or)]
+    public void ParseMatchOperator_ShouldReturnCorrectEnumValue_WhenValidStringIsProvided(string value, MatchOperator expected)
+    {
+        // Arrange & Act
+        var result = StringUtils.ParseMatchOperator(value);
+
+        // Assert
+        result.Should().Be(expected);
+    }
+
+    [Theory]
+    [InlineData(null, MatchOperator.Or)]
+    [InlineData("", MatchOperator.Or)]
+    [InlineData("and", MatchOperator.Or)]
+    [InlineData("InvalidValue", MatchOperator.Or)]
+    public void ParseMatchOperator_ShouldReturnDefaultEnumValue_WhenInvalidOrNullStringIsProvided(string? value, MatchOperator expected)
+    {
+        // Arrange & Act
+        var result = StringUtils.ParseMatchOperator(value);
+
+        // Assert
+        result.Should().Be(expected);
+    }
+
     [Theory]
     [InlineData("'s")]
     [InlineData("\"s")]
     public void StringUtils_TryParseQuotedString_With_UnexpectedUnclosedString_Returns_False(string input)
     {
         // Act
-        bool valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
+        var valid = StringUtils.TryParseQuotedString(input, out _, out _);
 
         // Assert
         valid.Should().BeFalse();
@@ -25,7 +52,7 @@ public class StringUtilsTests
     public void StringUtils_TryParseQuotedString_With_InvalidStringLength_Returns_False(string input)
     {
         // Act
-        bool valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
+        var valid = StringUtils.TryParseQuotedString(input, out _, out _);
 
         // Assert
         valid.Should().BeFalse();
@@ -37,7 +64,7 @@ public class StringUtilsTests
     public void StringUtils_TryParseQuotedString_With_InvalidStringQuoteCharacter_Returns_False(string input)
     {
         // Act
-        bool valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
+        var valid = StringUtils.TryParseQuotedString(input, out _, out _);
 
         // Assert
         valid.Should().BeFalse();
@@ -47,10 +74,10 @@ public class StringUtilsTests
     public void StringUtils_TryParseQuotedString_With_UnexpectedUnrecognizedEscapeSequence_Returns_False()
     {
         // Arrange
-        string input = new string(new[] { '"', '\\', 'u', '?', '"' });
+        var input = new string(new[] { '"', '\\', 'u', '?', '"' });
 
         // Act
-        bool valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
+        var valid = StringUtils.TryParseQuotedString(input, out _, out _);
 
         // Assert
         valid.Should().BeFalse();
@@ -64,7 +91,7 @@ public class StringUtilsTests
     public void StringUtils_TryParseQuotedString_SingleQuotedString(string input, string expectedResult)
     {
         // Act
-        bool valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
+        var valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
 
         // Assert
         valid.Should().BeTrue();
@@ -93,7 +120,7 @@ public class StringUtilsTests
     public void StringUtils_TryParseQuotedString_DoubleQuotedString(string input, string expectedResult)
     {
         // Act
-        bool valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
+        var valid = StringUtils.TryParseQuotedString(input, out var result, out var quote);
 
         // Assert
         valid.Should().BeTrue();
diff --git a/test/WireMock.Net.Tests/WireMock.Net.Tests.csproj b/test/WireMock.Net.Tests/WireMock.Net.Tests.csproj
index f6a3fb59..3fa60e0c 100644
--- a/test/WireMock.Net.Tests/WireMock.Net.Tests.csproj
+++ b/test/WireMock.Net.Tests/WireMock.Net.Tests.csproj
@@ -3,6 +3,8 @@
     <PropertyGroup>
         <Authors>Stef Heyenrath</Authors>
         <TargetFrameworks>net452;net461;netcoreapp3.1;net6.0;net7.0</TargetFrameworks>
+        <LangVersion>11</LangVersion>
+        <Nullable>enable</Nullable>
         <IsPackable>false</IsPackable>
         <DebugType>full</DebugType>
         <AssemblyName>WireMock.Net.Tests</AssemblyName>
diff --git a/test/WireMock.Net.Tests/WireMockServerTests.WithBody.cs b/test/WireMock.Net.Tests/WireMockServerTests.WithBody.cs
index a891dfd3..cc90bef7 100644
--- a/test/WireMock.Net.Tests/WireMockServerTests.WithBody.cs
+++ b/test/WireMock.Net.Tests/WireMockServerTests.WithBody.cs
@@ -1,9 +1,8 @@
 #if !NET452
-//using System;
+using System;
 using System.Collections.Generic;
 using System.Net;
 using System.Net.Http;
-//using System.Net.Http.Json;
 using System.Threading.Tasks;
 using FluentAssertions;
 using WireMock.Matchers;
@@ -21,6 +20,103 @@ public partial class WireMockServerTests
         public string? Hi { get; set; }
     }
 
+    [Fact]
+    public async Task WireMockServer_WithBodyAsJson_Using_PostAsJsonAsync_And_MultipleJmesPathMatchers_ShouldMatch()
+    {
+        // Arrange
+        var server = WireMockServer.Start();
+        server.Given(
+            Request.Create()
+                .WithPath("/a")
+                .WithBody(
+                    new IMatcher[]
+                    {
+                        new JmesPathMatcher("requestId == '1'"),
+                        new JmesPathMatcher("value == 'A'")
+                    },
+                    MatchOperator.And
+                )
+                .UsingPost()
+            )
+            .RespondWith(Response.Create().WithStatusCode(HttpStatusCode.OK));
+
+        server.Given(
+                Request.Create()
+                    .WithPath("/a")
+                    .WithBody(
+                        new IMatcher[]
+                        {
+                            new JmesPathMatcher("requestId == '2'"),
+                            new JmesPathMatcher("value == 'A'")
+                        },
+                        MatchOperator.And
+                    )
+                    .UsingPost()
+            )
+            .RespondWith(Response.Create().WithStatusCode(HttpStatusCode.Moved));
+
+        // Act
+        var requestUri = new Uri($"http://localhost:{server.Port}/a");
+
+        var json = new { requestId = "1", value = "A" };
+        var response = await server.CreateClient().PostAsJsonAsync(requestUri, json).ConfigureAwait(false);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.OK);
+
+        server.Stop();
+    }
+
+    [Fact]
+    public async Task WireMockServer_WithBodyAsJson_Using_PostAsJsonAsync_And_MultipleJmesPathMatchers_ShouldMatch_BestMatching()
+    {
+        // Arrange
+        var server = WireMockServer.Start();
+        server.Given(
+                Request.Create()
+                    .WithPath("/a")
+                    .WithBody(
+                        new IMatcher[]
+                        {
+                            new JmesPathMatcher("extra == 'X'"),
+                            new JmesPathMatcher("requestId == '1'"),
+                            new JmesPathMatcher("value == 'A'")
+                        },
+                        MatchOperator.And
+                    )
+                    .UsingPost()
+            )
+            .AtPriority(1) // Higher priority
+            .RespondWith(Response.Create().WithStatusCode(HttpStatusCode.OK));
+
+        server.Given(
+                Request.Create()
+                    .WithPath("/a")
+                    .WithBody(
+                        new IMatcher[]
+                        {
+                            new JmesPathMatcher("requestId == '1'"),
+                            new JmesPathMatcher("value == 'A'")
+                        },
+                        MatchOperator.And
+                    )
+                    .UsingPost()
+            )
+            .AtPriority(2)
+            .RespondWith(Response.Create().WithStatusCode(HttpStatusCode.Moved));
+
+        // Act
+        var requestUri = new Uri($"http://localhost:{server.Port}/a");
+
+        var json = new { extra = "X", requestId = "1", value = "A" };
+        var response = await server.CreateClient().PostAsJsonAsync(requestUri, json).ConfigureAwait(false);
+
+        // Assert
+        response.StatusCode.Should().Be(HttpStatusCode.OK);
+
+        server.Stop();
+    }
+
     [Fact]
     public async Task WireMockServer_WithBodyAsJson_Using_PostAsJsonAsync_And_WildcardMatcher_ShouldMatch()
     {