diff --git a/libraries/SITL/SIM_JSON.cpp b/libraries/SITL/SIM_JSON.cpp
index be64d053ed..0d37e7529a 100644
--- a/libraries/SITL/SIM_JSON.cpp
+++ b/libraries/SITL/SIM_JSON.cpp
@@ -255,7 +255,7 @@ void JSON::recv_fdm(const struct sitl_input &input)
 
     const uint32_t received_bitmask = parse_sensors((const char *)(p1+1));
     if (received_bitmask == 0) {
-        // did not receve one of the mandatory fields
+        // did not receive one of the mandatory fields
         printf("Did not contain all mandatory fields\n");
         return;
     }
diff --git a/libraries/SITL/SIM_JSON_Master.cpp b/libraries/SITL/SIM_JSON_Master.cpp
index 903c1ea6dc..3eb6f622a3 100644
--- a/libraries/SITL/SIM_JSON_Master.cpp
+++ b/libraries/SITL/SIM_JSON_Master.cpp
@@ -13,7 +13,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 /*
-  Send and receve JSON backend data to alow a second AP instance to ride along
+  Send and receive JSON backend data to alow a second AP instance to ride along
 */
 
 #include "SIM_JSON_Master.h"
diff --git a/libraries/SITL/SIM_JSON_Master.h b/libraries/SITL/SIM_JSON_Master.h
index 36c4d827b2..9a568f6ed1 100644
--- a/libraries/SITL/SIM_JSON_Master.h
+++ b/libraries/SITL/SIM_JSON_Master.h
@@ -13,7 +13,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 /*
-  Send and receve JSON backend data to alow a second AP instance to ride along
+  Send and receive JSON backend data to alow a second AP instance to ride along
 */
 
 #pragma once
diff --git a/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c b/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c
index 7c681ed7ea..ffafd33edb 100644
--- a/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c
+++ b/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c
@@ -725,7 +725,7 @@ void my_mexReturnArrayFromBuff(const int argno,io_buff *buff,const int line)
                 break;
         if(n==maxelements)                             // If no new-line found inside limit...
             deleteelements=returnelements=maxelements; // ...return first part of splited line.
-        else if(n==returnelements)                     // If new-line not recived inside limit...
+        else if(n==returnelements)                     // If new-line not received inside limit...
             deleteelements=returnelements=0;           // ...return empty string, and delete nothing.
         else if(n>0 && buff->ptr[n-1]=='\r')           // If(*3) new-line, return line of char but not nl chars.
             deleteelements=2+(returnelements=n-1);