diff --git a/mesh/v1alpha1/config.pb.go b/mesh/v1alpha1/config.pb.go
index b277a4bc83..8bfc44c33c 100644
--- a/mesh/v1alpha1/config.pb.go
+++ b/mesh/v1alpha1/config.pb.go
@@ -116,6 +116,9 @@ type MeshConfig struct {
 	// File address for the proxy access log (e.g. /dev/stdout).
 	// Empty value disables access logging.
 	AccessLogFile string `protobuf:"bytes,13,opt,name=access_log_file,json=accessLogFile,proto3" json:"access_log_file,omitempty"`
+	// Format for the proxy access log (text or json).
+	// Default value is text.
+	AccessLogFormat string `protobuf:"bytes,24,opt,name=access_log_format,json=accessLogFormat,proto3" json:"access_log_format,omitempty"`
 	// Default proxy config used by the proxy injection mechanism operating in the mesh
 	// (e.g. Kubernetes admission controller)
 	// In case of Kubernetes, the proxy config is applied once during the injection process,
@@ -219,6 +222,13 @@ func (m *MeshConfig) GetAccessLogFile() string {
 	return ""
 }
 
+func (m *MeshConfig) GetAccessLogFormat() string {
+	if m != nil {
+		return m.AccessLogFormat
+	}
+	return ""
+}
+
 func (m *MeshConfig) GetDefaultConfig() *ProxyConfig {
 	if m != nil {
 		return m.DefaultConfig
@@ -398,6 +408,14 @@ func (m *MeshConfig) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i++
 	}
+	if len(m.AccessLogFormat) > 0 {
+		dAtA[i] = 0xc2
+		i++
+		dAtA[i] = 0x1
+		i++
+		i = encodeVarintConfig(dAtA, i, uint64(len(m.AccessLogFormat)))
+		i += copy(dAtA[i:], m.AccessLogFormat)
+	}
 	return i, nil
 }
 
@@ -470,6 +488,10 @@ func (m *MeshConfig) Size() (n int) {
 	if m.EnableSdsTokenMount {
 		n += 3
 	}
+	l = len(m.AccessLogFormat)
+	if l > 0 {
+		n += 2 + l + sovConfig(uint64(l))
+	}
 	return n
 }
 
@@ -921,6 +943,35 @@ func (m *MeshConfig) Unmarshal(dAtA []byte) error {
 				}
 			}
 			m.EnableSdsTokenMount = bool(v != 0)
+		case 24:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field AccessLogFormat", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowConfig
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthConfig
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.AccessLogFormat = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipConfig(dAtA[iNdEx:])
@@ -1050,47 +1101,47 @@ var (
 func init() { proto.RegisterFile("mesh/v1alpha1/config.proto", fileDescriptorConfig) }
 
 var fileDescriptorConfig = []byte{
-	// 657 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x6c, 0x53, 0x5f, 0x4f, 0xdb, 0x3e,
-	0x14, 0xfd, 0x05, 0x02, 0x0d, 0xee, 0xbf, 0xd4, 0xfd, 0x15, 0x4c, 0x7f, 0x52, 0x7f, 0x11, 0xd3,
-	0xb6, 0x6a, 0x9a, 0x52, 0x01, 0xda, 0xc3, 0x1e, 0xa1, 0xac, 0x1b, 0x11, 0x68, 0x55, 0x5a, 0x5e,
-	0xf6, 0x62, 0x85, 0xd8, 0x4d, 0x2c, 0xdc, 0x38, 0x8a, 0x5d, 0x04, 0xdf, 0x6b, 0x1f, 0x62, 0x8f,
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-	0xf7, 0x1a, 0xf4, 0x97, 0x54, 0xa6, 0xa3, 0xfb, 0xe3, 0x88, 0xe7, 0x69, 0x74, 0x3c, 0x8a, 0x45,
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-	0x00,
+	// 669 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x6c, 0x54, 0x5d, 0x4f, 0xdb, 0x30,
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+	0xe7, 0xfb, 0x8d, 0x91, 0xeb, 0x35, 0x7c, 0x38, 0x72, 0x3d, 0xe8, 0x37, 0x47, 0xae, 0xd7, 0xf2,
+	0x77, 0x4f, 0x7b, 0x7f, 0x1f, 0x3b, 0xce, 0xbf, 0xc7, 0x8e, 0xf3, 0xf0, 0xd8, 0x71, 0xfe, 0xb4,
+	0xed, 0x4a, 0x28, 0xef, 0x47, 0x39, 0xed, 0xbf, 0xfa, 0x18, 0xae, 0xb7, 0xcd, 0xd9, 0x1f, 0xff,
+	0x0f, 0x00, 0x00, 0xff, 0xff, 0xff, 0x4d, 0xb0, 0x4d, 0x81, 0x04, 0x00, 0x00,
 }
diff --git a/mesh/v1alpha1/config.proto b/mesh/v1alpha1/config.proto
index d68082a4d9..9ee376db6b 100644
--- a/mesh/v1alpha1/config.proto
+++ b/mesh/v1alpha1/config.proto
@@ -105,6 +105,10 @@ message MeshConfig {
   // File address for the proxy access log (e.g. /dev/stdout).
   // Empty value disables access logging.
   string access_log_file = 13;
+  
+  // Format for the proxy access log (text or json).
+  // Default value is text.
+  string access_log_format = 24;
 
   // Default proxy config used by the proxy injection mechanism operating in the mesh
   // (e.g. Kubernetes admission controller)
@@ -136,4 +140,7 @@ message MeshConfig {
   // for k8s service account JWT, so that K8s API server mounts k8s service account JWT to envoy container, which 
   // will be used to generate key/cert eventually. This isn't supported for non-k8s case.
   bool enable_sds_token_mount = 23;
+
+  // $hide_from_docs
+  // Next available field number: 25
 }
diff --git a/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html b/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html
index a80db8b9e8..bb24007b02 100644
--- a/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html
+++ b/mesh/v1alpha1/istio.mesh.v1alpha1.pb.html
@@ -167,6 +167,15 @@ <h2 id="MeshConfig">MeshConfig</h2>
 <p>File address for the proxy access log (e.g. /dev/stdout).
 Empty value disables access logging.</p>
 
+</td>
+</tr>
+<tr id="MeshConfig-access_log_format">
+<td><code>accessLogFormat</code></td>
+<td><code>string</code></td>
+<td>
+<p>Format for the proxy access log (text or json).
+Default value is text.</p>
+
 </td>
 </tr>
 <tr id="MeshConfig-default_config">
diff --git a/python/istio_api/mesh/v1alpha1/config_pb2.py b/python/istio_api/mesh/v1alpha1/config_pb2.py
index 3bfbabbccb..0bfcfca8bd 100644
--- a/python/istio_api/mesh/v1alpha1/config_pb2.py
+++ b/python/istio_api/mesh/v1alpha1/config_pb2.py
@@ -21,7 +21,7 @@
   name='mesh/v1alpha1/config.proto',
   package='istio.mesh.v1alpha1',
   syntax='proto3',
-  serialized_pb=_b('\n\x1amesh/v1alpha1/config.proto\x12\x13istio.mesh.v1alpha1\x1a\x1egoogle/protobuf/duration.proto\x1a\x19mesh/v1alpha1/proxy.proto\"\x9b\x05\n\nMeshConfig\x12\x1a\n\x12mixer_check_server\x18\x01 \x01(\t\x12\x1b\n\x13mixer_report_server\x18\x02 \x01(\t\x12\x1d\n\x15\x64isable_policy_checks\x18\x03 \x01(\x08\x12\x19\n\x11proxy_listen_port\x18\x04 \x01(\x05\x12\x17\n\x0fproxy_http_port\x18\x05 \x01(\x05\x12\x32\n\x0f\x63onnect_timeout\x18\x06 \x01(\x0b\x32\x19.google.protobuf.Duration\x12\x15\n\ringress_class\x18\x07 \x01(\t\x12\x17\n\x0fingress_service\x18\x08 \x01(\t\x12V\n\x17ingress_controller_mode\x18\t \x01(\x0e\x32\x35.istio.mesh.v1alpha1.MeshConfig.IngressControllerMode\x12\x16\n\x0e\x65nable_tracing\x18\x0c \x01(\x08\x12\x17\n\x0f\x61\x63\x63\x65ss_log_file\x18\r \x01(\t\x12\x38\n\x0e\x64\x65\x66\x61ult_config\x18\x0e \x01(\x0b\x32 .istio.mesh.v1alpha1.ProxyConfig\x12\'\n\x1f\x65nable_client_side_policy_check\x18\x13 \x01(\x08\x12\x14\n\x0csds_uds_path\x18\x14 \x01(\t\x12\x16\n\x0egalley_address\x18\x16 \x01(\t\x12\x1e\n\x16\x65nable_sds_token_mount\x18\x17 \x01(\x08\"9\n\x15IngressControllerMode\x12\x07\n\x03OFF\x10\x00\x12\x0b\n\x07\x44\x45\x46\x41ULT\x10\x01\x12\n\n\x06STRICT\x10\x02J\x04\x08\n\x10\x0bJ\x04\x08\x0b\x10\x0cJ\x04\x08\x0f\x10\x10J\x04\x08\x10\x10\x11J\x04\x08\x11\x10\x12J\x04\x08\x12\x10\x13J\x04\x08\x15\x10\x16\x42\x1cZ\x1aistio.io/api/mesh/v1alpha1b\x06proto3')
+  serialized_pb=_b('\n\x1amesh/v1alpha1/config.proto\x12\x13istio.mesh.v1alpha1\x1a\x1egoogle/protobuf/duration.proto\x1a\x19mesh/v1alpha1/proxy.proto\"\xb6\x05\n\nMeshConfig\x12\x1a\n\x12mixer_check_server\x18\x01 \x01(\t\x12\x1b\n\x13mixer_report_server\x18\x02 \x01(\t\x12\x1d\n\x15\x64isable_policy_checks\x18\x03 \x01(\x08\x12\x19\n\x11proxy_listen_port\x18\x04 \x01(\x05\x12\x17\n\x0fproxy_http_port\x18\x05 \x01(\x05\x12\x32\n\x0f\x63onnect_timeout\x18\x06 \x01(\x0b\x32\x19.google.protobuf.Duration\x12\x15\n\ringress_class\x18\x07 \x01(\t\x12\x17\n\x0fingress_service\x18\x08 \x01(\t\x12V\n\x17ingress_controller_mode\x18\t \x01(\x0e\x32\x35.istio.mesh.v1alpha1.MeshConfig.IngressControllerMode\x12\x16\n\x0e\x65nable_tracing\x18\x0c \x01(\x08\x12\x17\n\x0f\x61\x63\x63\x65ss_log_file\x18\r \x01(\t\x12\x19\n\x11\x61\x63\x63\x65ss_log_format\x18\x18 \x01(\t\x12\x38\n\x0e\x64\x65\x66\x61ult_config\x18\x0e \x01(\x0b\x32 .istio.mesh.v1alpha1.ProxyConfig\x12\'\n\x1f\x65nable_client_side_policy_check\x18\x13 \x01(\x08\x12\x14\n\x0csds_uds_path\x18\x14 \x01(\t\x12\x16\n\x0egalley_address\x18\x16 \x01(\t\x12\x1e\n\x16\x65nable_sds_token_mount\x18\x17 \x01(\x08\"9\n\x15IngressControllerMode\x12\x07\n\x03OFF\x10\x00\x12\x0b\n\x07\x44\x45\x46\x41ULT\x10\x01\x12\n\n\x06STRICT\x10\x02J\x04\x08\n\x10\x0bJ\x04\x08\x0b\x10\x0cJ\x04\x08\x0f\x10\x10J\x04\x08\x10\x10\x11J\x04\x08\x11\x10\x12J\x04\x08\x12\x10\x13J\x04\x08\x15\x10\x16\x42\x1cZ\x1aistio.io/api/mesh/v1alpha1b\x06proto3')
   ,
   dependencies=[google_dot_protobuf_dot_duration__pb2.DESCRIPTOR,mesh_dot_v1alpha1_dot_proxy__pb2.DESCRIPTOR,])
 
@@ -48,8 +48,8 @@
   ],
   containing_type=None,
   options=None,
-  serialized_start=679,
-  serialized_end=736,
+  serialized_start=706,
+  serialized_end=763,
 )
 _sym_db.RegisterEnumDescriptor(_MESHCONFIG_INGRESSCONTROLLERMODE)
 
@@ -139,35 +139,42 @@
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='default_config', full_name='istio.mesh.v1alpha1.MeshConfig.default_config', index=11,
+      name='access_log_format', full_name='istio.mesh.v1alpha1.MeshConfig.access_log_format', index=11,
+      number=24, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=_b("").decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='default_config', full_name='istio.mesh.v1alpha1.MeshConfig.default_config', index=12,
       number=14, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='enable_client_side_policy_check', full_name='istio.mesh.v1alpha1.MeshConfig.enable_client_side_policy_check', index=12,
+      name='enable_client_side_policy_check', full_name='istio.mesh.v1alpha1.MeshConfig.enable_client_side_policy_check', index=13,
       number=19, type=8, cpp_type=7, label=1,
       has_default_value=False, default_value=False,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='sds_uds_path', full_name='istio.mesh.v1alpha1.MeshConfig.sds_uds_path', index=13,
+      name='sds_uds_path', full_name='istio.mesh.v1alpha1.MeshConfig.sds_uds_path', index=14,
       number=20, type=9, cpp_type=9, label=1,
       has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='galley_address', full_name='istio.mesh.v1alpha1.MeshConfig.galley_address', index=14,
+      name='galley_address', full_name='istio.mesh.v1alpha1.MeshConfig.galley_address', index=15,
       number=22, type=9, cpp_type=9, label=1,
       has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='enable_sds_token_mount', full_name='istio.mesh.v1alpha1.MeshConfig.enable_sds_token_mount', index=15,
+      name='enable_sds_token_mount', full_name='istio.mesh.v1alpha1.MeshConfig.enable_sds_token_mount', index=16,
       number=23, type=8, cpp_type=7, label=1,
       has_default_value=False, default_value=False,
       message_type=None, enum_type=None, containing_type=None,
@@ -187,7 +194,7 @@
   oneofs=[
   ],
   serialized_start=111,
-  serialized_end=778,
+  serialized_end=805,
 )
 
 _MESHCONFIG.fields_by_name['connect_timeout'].message_type = google_dot_protobuf_dot_duration__pb2._DURATION