diff --git a/lib/jsmn-shadinger-1.0/README.md b/lib/jsmn-shadinger-1.0/README.md
index f98503eb1..bf5b59565 100644
--- a/lib/jsmn-shadinger-1.0/README.md
+++ b/lib/jsmn-shadinger-1.0/README.md
@@ -1,9 +1,15 @@
 # JSMN lightweight JSON parser for Tasmota
 
-Intro:
+Intro: this library uses the JSMN in-place JSON parser.
+See https://github.com/zserge/jsmn and https://zserge.com/jsmn/
+
+It is proposed as a replacement for ArduinoJson. It has less features, does only parsing but does it in a very efficient way.
 
 ## Benefits
 
+First, the memory impact is very low: 4 bytes per token and no need to add an extra buffer for values.
+Second, the code is much smaller than ArduinoJson by 5-7KB.
+
 ## How to use
 
 `{"Device":"0x1234","Power":true,"Temperature":25.5}`
@@ -24,7 +30,8 @@ If what you need is to parse a JSON Object for values with default values:
 #include "JsonParser.h"
 
 char json_buffer[] = "{\"Device\":\"0x1234\",\"Power\":true,\"Temperature\":25.6}";
-JsonParserObject root = JsonParser(json_buffer).getRootObject();
+JsonParser parser(json_buffer);
+JsonParserObject root = parser.getRootObject();
 if (!root) { ResponseCmndChar_P(PSTR("Invalid JSON")); return; }
 
 uint16_t d = root.getUInt(PSTR("DEVICE"), 0xFFFF);   // case insensitive
@@ -37,7 +44,8 @@ Alternative pattern, if you want to test the existence of the attribute first:
 #include "JsonParser.h"
 
 char json_buffer[] = "{\"Device\":\"0x1234\",\"Power\":true,\"Temperature\":25.6}";
-JsonParserObject root = JsonParser(json_buffer).getRootObject();
+JsonParser parser(json_buffer);
+JsonParserObject root = parser.getRootObject();
 if (!root) { ResponseCmndChar_P(PSTR("Invalid JSON")); return; }
 
 JsonParserToken val = root[PSTR("DEVICE")];
@@ -54,6 +62,12 @@ if (val) {
 }
 ```
 
+WARNING: never use the following form:
+```
+JsonParserObject root = JsonParser(json_buffer).getRootObject();
+```
+In this case, the `JsonParser` object is temporary and destroyed at the end of the expression. Setting the JsonParser to a local variable ensures that the lifetime of the object is extended to the end of the scope.
+
 ## Types and conversion
 
 JSMN relies on the concept of JSON Tokens `JsonParserToken`. Tokens do not hold any data, but point to token boundaries in JSON string instead. Every jsmn token has a type, which indicates the type of corresponding JSON token. JSMN for Tasmota extends the type from JSMN to ease further parsing.
diff --git a/lib/jsmn-shadinger-1.0/test/test-json.cpp b/lib/jsmn-shadinger-1.0/test/test-json.cpp
index 9ede0a2bb..ccfbf45fd 100644
--- a/lib/jsmn-shadinger-1.0/test/test-json.cpp
+++ b/lib/jsmn-shadinger-1.0/test/test-json.cpp
@@ -15,7 +15,7 @@ int main(int argc, char* argv[]) {
   // char * json_str = test_complex;
   char * json_str = test_simple;
 
-  JsonParser parser(64);      // size for 64 tokens
+  // JsonParser parser(64);      // size for 64 tokens
 
   int r = parser.parse(json_str);
 
diff --git a/tasmota/support.ino b/tasmota/support.ino
index 18c5469ae..23b8780fa 100644
--- a/tasmota/support.ino
+++ b/tasmota/support.ino
@@ -1473,7 +1473,8 @@ bool JsonTemplate(char* dataBuf)
 
   if (strlen(dataBuf) < 9) { return false; }  // Workaround exception if empty JSON like {} - Needs checks
 
-  JsonParserObject root = JsonParser((char*) dataBuf).getRootObject();
+  JsonParser parser((char*) dataBuf);
+  JsonParserObject root = parser.getRootObject();
   if (!root) { return false; }
 
   // All parameters are optional allowing for partial changes
diff --git a/tasmota/xdrv_01_webserver.ino b/tasmota/xdrv_01_webserver.ino
index 16daa8f6f..f1aff262b 100644
--- a/tasmota/xdrv_01_webserver.ino
+++ b/tasmota/xdrv_01_webserver.ino
@@ -27,8 +27,6 @@
 
 #define XDRV_01                               1
 
-#include "JsonParser.h"
-
 #ifndef WIFI_SOFT_AP_CHANNEL
 #define WIFI_SOFT_AP_CHANNEL                  1          // Soft Access Point Channel number between 1 and 11 as used by WifiManager web GUI
 #endif
@@ -3366,7 +3364,8 @@ bool JsonWebColor(const char* dataBuf)
     }
   }
 #else
-  JsonParserObject root = JsonParser((char*) dataBuf).getRootObject();
+  JsonParser parser((char*) dataBuf);
+  JsonParserObject root = parser.getRootObject();
   JsonParserArray arr = root[PSTR(D_CMND_WEBCOLOR)].getArray();
   if (arr) {  // if arr is valid, i.e. json is valid, the key D_CMND_WEBCOLOR was found and the token is an arra
     uint32_t i = 0;
diff --git a/tasmota/xdrv_05_irremote.ino b/tasmota/xdrv_05_irremote.ino
index ebd1f06df..0c96e7d2a 100644
--- a/tasmota/xdrv_05_irremote.ino
+++ b/tasmota/xdrv_05_irremote.ino
@@ -25,7 +25,6 @@
 #define XDRV_05             5
 
 #include <IRremoteESP8266.h>
-#include "JsonParser.h"
 
 enum IrErrors { IE_NO_ERROR, IE_INVALID_RAWDATA, IE_INVALID_JSON, IE_SYNTAX_IRSEND };
 
@@ -204,7 +203,8 @@ uint32_t IrRemoteCmndIrSendJson(void)
   uint16_t repeat = root[UpperCase_P(parm_uc, PSTR(D_JSON_IR_REPEAT))];
 #else
   RemoveSpace(XdrvMailbox.data);    // TODO is this really needed?
-  JsonParserObject root = JsonParser((char*) XdrvMailbox.data).getRootObject();
+  JsonParser parser(XdrvMailbox.data);
+  JsonParserObject root = parser.getRootObject();
   if (!root) { return IE_INVALID_JSON; }
 
   // IRsend { "protocol": "SAMSUNG", "bits": 32, "data": 551502015 }
diff --git a/tasmota/xdrv_05_irremote_full.ino b/tasmota/xdrv_05_irremote_full.ino
index d72711fc8..275112bab 100644
--- a/tasmota/xdrv_05_irremote_full.ino
+++ b/tasmota/xdrv_05_irremote_full.ino
@@ -29,7 +29,6 @@
 #include <IRrecv.h>
 #include <IRutils.h>
 #include <IRac.h>
-#include "JsonParser.h"
 
 enum IrErrors { IE_RESPONSE_PROVIDED, IE_NO_ERROR, IE_INVALID_RAWDATA, IE_INVALID_JSON, IE_SYNTAX_IRSEND, IE_SYNTAX_IRHVAC,
                 IE_UNSUPPORTED_HVAC, IE_UNSUPPORTED_PROTOCOL };
@@ -288,7 +287,8 @@ uint32_t IrRemoteCmndIrHvacJson(void)
   stdAc::state_t state, prev;
 
   //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("IRHVAC: Received %s"), XdrvMailbox.data);
-  JsonParserObject root = JsonParser((char*) XdrvMailbox.data).getRootObject();
+  JsonParser parser(XdrvMailbox.data);
+  JsonParserObject root = parser.getRootObject();
   if (!root) { return IE_INVALID_JSON; }
 
   // from: https://github.com/crankyoldgit/IRremoteESP8266/blob/master/examples/CommonAcControl/CommonAcControl.ino
diff --git a/tasmota/xdrv_09_timers.ino b/tasmota/xdrv_09_timers.ino
index 79efc1f1c..b9d6d57c7 100644
--- a/tasmota/xdrv_09_timers.ino
+++ b/tasmota/xdrv_09_timers.ino
@@ -425,7 +425,8 @@ void CmndTimer(void)
 #if defined(USE_RULES)==0 && defined(USE_SCRIPT)==0
         if (devices_present) {
 #endif
-          JsonParserObject root = JsonParser(XdrvMailbox.data).getRootObject();
+          JsonParser parser(XdrvMailbox.data);
+          JsonParserObject root = parser.getRootObject();
           if (!root) {
             Response_P(PSTR("{\"" D_CMND_TIMER "%d\":\"" D_JSON_INVALID_JSON "\"}"), index); // JSON decode failed
             error = 1;
diff --git a/tasmota/xdrv_10_rules.ino b/tasmota/xdrv_10_rules.ino
index abc6fcece..7377585c5 100644
--- a/tasmota/xdrv_10_rules.ino
+++ b/tasmota/xdrv_10_rules.ino
@@ -532,7 +532,7 @@ bool RulesRuleMatch(uint8_t rule_set, String &event, String &rule)
 #else
 
   String buf = event;   // copy the string into a new buffer that will be modified
-  JsonParser parser = JsonParser((char*)buf.c_str());
+  JsonParser parser((char*)buf.c_str());
   JsonParserObject obj = parser.getRootObject();
   if (!obj) {
     AddLog_P2(LOG_LEVEL_DEBUG, PSTR("RUL: Event too long (%d)"), event.length());
@@ -1069,7 +1069,8 @@ bool RulesMqttData(void)
       if (event_item.Key.length() == 0) {   //If did not specify Key
         value = sData;
       } else {      //If specified Key, need to parse Key/Value from JSON data
-        JsonParserObject jsonData = JsonParser((char*)sData.c_str()).getRootObject();
+        JsonParser parser((char*)sData.c_str());
+        JsonParserObject jsonData = parser.getRootObject();
 
         String key1 = event_item.Key;
         String key2;
diff --git a/tasmota/xdrv_17_rcswitch.ino b/tasmota/xdrv_17_rcswitch.ino
index af89e0a9f..af3dc1bba 100644
--- a/tasmota/xdrv_17_rcswitch.ino
+++ b/tasmota/xdrv_17_rcswitch.ino
@@ -104,7 +104,8 @@ void CmndRfSend(void)
     int repeat = 10;
     int pulse = 350;
 
-    JsonParserObject root = JsonParser(XdrvMailbox.data).getRootObject();
+    JsonParser parser(XdrvMailbox.data);
+    JsonParserObject root = parser.getRootObject();
     if (root) {
       // RFsend {"data":0x501014,"bits":24,"protocol":1,"repeat":10,"pulse":350}
       char parm_uc[10];
diff --git a/tasmota/xdrv_20_hue.ino b/tasmota/xdrv_20_hue.ino
index 6bdc420af..7c2e29395 100644
--- a/tasmota/xdrv_20_hue.ino
+++ b/tasmota/xdrv_20_hue.ino
@@ -569,7 +569,7 @@ void HueLightsCommand(uint8_t device, uint32_t device_id, String &response) {
   if (Webserver->args()) {
     response = "[";
 
-    JsonParser parser = JsonParser((char*) Webserver->arg((Webserver->args())-1).c_str());
+    JsonParser parser((char*) Webserver->arg((Webserver->args())-1).c_str());
     JsonParserObject root = parser.getRootObject();
 
     JsonParserToken hue_on = root[PSTR("on")];
diff --git a/tasmota/xdrv_23_zigbee_2_devices.ino b/tasmota/xdrv_23_zigbee_2_devices.ino
index e3182faad..e68342da6 100644
--- a/tasmota/xdrv_23_zigbee_2_devices.ino
+++ b/tasmota/xdrv_23_zigbee_2_devices.ino
@@ -19,8 +19,6 @@
 
 #ifdef USE_ZIGBEE
 
-#include "JsonParser.h"
-
 #ifndef ZIGBEE_SAVE_DELAY_SECONDS
 #define ZIGBEE_SAVE_DELAY_SECONDS 2               // wait for 2s before saving Zigbee info
 #endif
diff --git a/tasmota/xdrv_23_zigbee_3_hue.ino b/tasmota/xdrv_23_zigbee_3_hue.ino
index 4b95a58be..1f4b18e19 100644
--- a/tasmota/xdrv_23_zigbee_3_hue.ino
+++ b/tasmota/xdrv_23_zigbee_3_hue.ino
@@ -218,7 +218,7 @@ void ZigbeeHandleHue(uint16_t shortaddr, uint32_t device_id, String &response) {
   if (Webserver->args()) {
     response = "[";
 
-    JsonParser parser = JsonParser((char*) Webserver->arg((Webserver->args())-1).c_str());
+    JsonParser parser((char*) Webserver->arg((Webserver->args())-1).c_str());
     JsonParserObject root = parser.getRootObject();
     
     JsonParserToken hue_on = root[PSTR("on")];
diff --git a/tasmota/xdrv_23_zigbee_A_impl.ino b/tasmota/xdrv_23_zigbee_A_impl.ino
index b35296370..90cc4e28c 100644
--- a/tasmota/xdrv_23_zigbee_A_impl.ino
+++ b/tasmota/xdrv_23_zigbee_A_impl.ino
@@ -21,8 +21,6 @@
 
 #define XDRV_23                    23
 
-#include "JsonParser.h"
-
 const char kZbCommands[] PROGMEM = D_PRFX_ZB "|"    // prefix
 #ifdef USE_ZIGBEE_ZNP
   D_CMND_ZIGBEEZNPSEND "|" D_CMND_ZIGBEEZNPRECEIVE "|"
@@ -626,7 +624,8 @@ void CmndZbSend(void) {
   // ZbSend { "device":"0x1234", "endpoint":"0x03", "send":{"Color":"1,2"} }
   // ZbSend { "device":"0x1234", "endpoint":"0x03", "send":{"Color":"0x1122,0xFFEE"} }
   if (zigbee.init_phase) { ResponseCmndChar_P(PSTR(D_ZIGBEE_NOT_STARTED)); return; }
-  JsonParserObject root = JsonParser(XdrvMailbox.data).getRootObject();
+  JsonParser parser(XdrvMailbox.data);
+  JsonParserObject root = parser.getRootObject();
   if (!root) { ResponseCmndChar_P(PSTR(D_JSON_INVALID_JSON)); return; }
 
   // params
@@ -748,7 +747,8 @@ void ZbBindUnbind(bool unbind) {    // false = bind, true = unbind
 
   // local endpoint is always 1, IEEE addresses are calculated
   if (zigbee.init_phase) { ResponseCmndChar_P(PSTR(D_ZIGBEE_NOT_STARTED)); return; }
-  JsonParserObject root = JsonParser(XdrvMailbox.data).getRootObject();
+  JsonParser parser(XdrvMailbox.data);
+  JsonParserObject root = parser.getRootObject();
   if (!root) { ResponseCmndChar_P(PSTR(D_JSON_INVALID_JSON)); return; }
 
   // params
@@ -1064,10 +1064,10 @@ void CmndZbSave(void) {
 //   ZbRestore {"Device":"0x5ADF","Name":"Petite_Lampe","IEEEAddr":"0x90FD9FFFFE03B051","ModelId":"TRADFRI bulb E27 WS opal 980lm","Manufacturer":"IKEA of Sweden","Endpoints":["0x01","0xF2"]}
 void CmndZbRestore(void) {
   if (zigbee.init_phase) { ResponseCmndChar_P(PSTR(D_ZIGBEE_NOT_STARTED)); return; }
-  JsonParser p(XdrvMailbox.data);
-  JsonParserToken root = p.getRoot();
+  JsonParser parser(XdrvMailbox.data);
+  JsonParserToken root = parser.getRoot();
 
-  if (!p || !(root.isObject() || root.isArray())) { ResponseCmndChar_P(PSTR(D_JSON_INVALID_JSON)); return; }
+  if (!parser || !(root.isObject() || root.isArray())) { ResponseCmndChar_P(PSTR(D_JSON_INVALID_JSON)); return; }
 
   // Check is root contains `ZbStatus<x>` key, if so change the root
   JsonParserToken zbstatus = root.getObject().findStartsWith(PSTR("ZbStatus"));
@@ -1219,7 +1219,8 @@ void CmndZbConfig(void) {
   // if (zigbee.init_phase) { ResponseCmndChar_P(PSTR(D_ZIGBEE_NOT_STARTED)); return; }
   RemoveAllSpaces(XdrvMailbox.data);
   if (strlen(XdrvMailbox.data) > 0) {
-    JsonParserObject root = JsonParser(XdrvMailbox.data).getRootObject();
+    JsonParser parser(XdrvMailbox.data);
+    JsonParserObject root = parser.getRootObject();
     if (!root) { ResponseCmndChar_P(PSTR(D_JSON_INVALID_JSON)); return; }
     // Channel
 
diff --git a/tasmota/xdrv_39_thermostat.ino b/tasmota/xdrv_39_thermostat.ino
index 9c70fcb2d..4a29ad36b 100644
--- a/tasmota/xdrv_39_thermostat.ino
+++ b/tasmota/xdrv_39_thermostat.ino
@@ -1328,7 +1328,8 @@ void ThermostatDebug(uint8_t ctr_output)
 #endif // DEBUG_THERMOSTAT
 
 void ThermostatGetLocalSensor(uint8_t ctr_output) {
-  JsonParserObject root = JsonParser(mqtt_data).getRootObject();
+  JsonParser parser(mqtt_data);
+  JsonParserObject root = parser.getRootObject();
   if (root) {
     JsonParserToken value_token = root[PSTR(THERMOSTAT_SENSOR_NAME)].getObject()[PSTR("Temperature")]; 
     if (value_token.isNum()) {
diff --git a/tasmota/xdrv_40_telegram.ino b/tasmota/xdrv_40_telegram.ino
index e1716f56d..9834d3b30 100644
--- a/tasmota/xdrv_40_telegram.ino
+++ b/tasmota/xdrv_40_telegram.ino
@@ -226,7 +226,8 @@ void TelegramAnalizeMessage(void) {
     Telegram.message[i][5] = "";
 
     String buf = Telegram.message[i][0];    // we need to keep a copy of the buffer
-    JsonParserObject root = JsonParser((char*)buf.c_str()).getRootObject();
+    JsonParser parser((char*)buf.c_str());
+    JsonParserObject root = parser.getRootObject();
     if (root) {
       Telegram.message[i][0] = root["update_id"].getStr();
       Telegram.message[i][1] = root["message"].getObject()["from"].getObject()["id"].getStr();