diff --git a/scripts/makeweb.py b/scripts/makeweb.py
index e48b8045..2d82721e 100644
--- a/scripts/makeweb.py
+++ b/scripts/makeweb.py
@@ -37,7 +37,7 @@ for filename in os.listdir(webroot):
             content = html_minify(content)
         elif filename.endswith(".css"):
             content = css_minify(content)
-        elif filename.endswith(".js") and filename != 'gaugemeter.js':
+        elif (filename.endswith(".js") and filename != 'gaugemeter.js') or filename.endswith(".json"):
             content = js_minify(content)
     except:
         print("WARN: Unable to minify")
diff --git a/src/web/AmsWebServer.cpp b/src/web/AmsWebServer.cpp
index aca5cd54..d89b5cea 100644
--- a/src/web/AmsWebServer.cpp
+++ b/src/web/AmsWebServer.cpp
@@ -27,6 +27,7 @@
 #include "root/temperature_html.h"
 #include "root/price_html.h"
 #include "root/notfound_html.h"
+#include "root/data_json.h"
 
 #include "base64.h"
 
@@ -604,163 +605,93 @@ void AmsWebServer::githubSvg() {
 
 void AmsWebServer::dataJson() {
 	printD("Serving /data.json over http...");
+	uint64_t now = millis64();
 
 	if(!checkSecurity(2))
 		return;
 
-	StaticJsonDocument<768> json;
+	float vcc = hw->getVcc();
+	int rssi = hw->getWifiRssi();
 
-    String jsonStr;
-	if(meterState->getLastUpdateMillis() > 0) {
-		int maxPwr = this->maxPwr;
-		if(maxPwr == 0) {
-			if(meterState->isThreePhase()) {
-				maxPwr = 20000;
-			} else {
-				maxPwr = 10000;
-			}
-		}
-
-		json["up"] = meterState->getLastUpdateMillis();
-		json["t"] = meterState->getPackageTimestamp();
-		json["freemem"] = ESP.getFreeHeap();
-		json.createNestedObject("data");
-		json["data"]["P"] = meterState->getActiveImportPower();
-		json["data"]["PO"] = meterState->getActiveExportPower();
-
-		double u1 = meterState->getL1Voltage();
-		double u2 = meterState->getL2Voltage();
-		double u3 = meterState->getL3Voltage();
-		double i1 = meterState->getL1Current();
-		double i2 = meterState->getL2Current();
-		double i3 = meterState->getL3Current();
-		double tpi = meterState->getActiveImportCounter();
-		double tpo = meterState->getActiveExportCounter();
-		double tqi = meterState->getReactiveImportCounter();
-		double tqo = meterState->getReactiveExportCounter();
-
-		double volt = u1;
-		double amp = i1;
-
-		if(u1 > 0) {
-			json["data"]["U1"] = u1;
-			json["data"]["I1"] = i1;
-		}
-		if(u2 > 0) {
-			json["data"]["U2"] = u2;
-			json["data"]["I2"] = i2;
-			if(i2 > amp) amp = i2;
-		}
-		if(u3 > 0) {
-			json["data"]["U3"] = u3;
-			json["data"]["I3"] = i3;
-			volt = (u1+u2+u3)/3;
-			if(i3 > amp) amp = i3;
-		}
-
-		if(tpi > 0) {
-			json["data"]["tPI"] = tpi;
-			json["data"]["tPO"] = tpo;
-			json["data"]["tQI"] = tqi;
-			json["data"]["tQO"] = tqo;
-		}
-
-		json["p_pct"] = min(meterState->getActiveImportPower()*100/maxPwr, 100);
-
-		json["v"] = volt;
-		json["v_pct"] = (max((int)volt-207, 1)*100/46);
-
-		int maxAmp = meterConfig->mainFuse == 0 ? 32 : meterConfig->mainFuse;
-
-		json["a"] = amp;
-		json["a_pct"] = amp * 100 / maxAmp;
-
-		if(meterConfig->productionCapacity > 0) {
-			int maxPrd = meterConfig->productionCapacity * 1000;
-			json["po_pct"] = min(meterState->getActiveExportPower()*100/maxPrd, 100);
-		}
-	} else {
-		json["p_pct"] = -1;
-		json["po_pct"] = -1;
-	}
-
-	json["id"] = WiFi.macAddress();
-	json["maxPower"] = maxPwr;
-	json["meterType"] = meterConfig->type;
-	json["uptime_seconds"] = millis64() / 1000;
-	double vcc = hw->getVcc();
-	json["vcc"] = serialized(String(vcc, 3));
-
-	double temp = hw->getTemperature();
-	json["temp"] = serialized(String(temp, 2));
-
-	json.createNestedObject("wifi");
-	float rssi = WiFi.RSSI();
-	rssi = isnan(rssi) ? -100.0 : rssi;
-	json["wifi"]["ssid"] = WiFi.SSID();
-	json["wifi"]["channel"] = (int) WiFi.channel();
-	json["wifi"]["rssi"] = rssi;
-
-	json.createNestedObject("status");
-
-	String espStatus;
+	uint8_t espStatus;
 	if(vcc == 0) {
-		espStatus = "secondary";
+		espStatus = 0;
 	} else if(vcc > 3.1) {
-		espStatus = "success";
+		espStatus = 1;
 	} else if(vcc > 2.8) {
-		espStatus = "warning";
+		espStatus = 2;
 	} else {
-		espStatus = "danger";
+		espStatus = 3;
 	}
-	json["status"]["esp"] = espStatus;
 
-	unsigned long now = millis();
-	String hanStatus;
+	uint8_t hanStatus;
 	if(meterConfig->type == 0) {
-		hanStatus = "secondary";
+		hanStatus = 0;
 	} else if(now - meterState->getLastUpdateMillis() < 15000) {
-		hanStatus = "success";
+		hanStatus = 1;
 	} else if(now - meterState->getLastUpdateMillis() < 30000) {
-		hanStatus = "warning";
+		hanStatus = 2;
 	} else {
-		hanStatus = "danger";
+		hanStatus = 3;
 	}
-	json["status"]["han"] = hanStatus;
 
-	String wifiStatus;
+	uint8_t wifiStatus;
 	if(rssi > -75) {
-		wifiStatus = "success";
+		wifiStatus = 1;
 	} else if(rssi > -95) {
-		wifiStatus = "warning";
+		wifiStatus = 2;
 	} else {
-		wifiStatus = "danger";
+		wifiStatus = 3;
 	}
-	json["status"]["wifi"] = wifiStatus;
 
-	String mqttStatus;
+	uint8_t mqttStatus;
 	if(!mqttEnabled) {
-		mqttStatus = "secondary";
+		mqttStatus = 0;
 	} else if(mqtt->connected()) {
-		mqttStatus = "success";
+		mqttStatus = 1;
 	} else if(mqtt->lastError() == 0) {
-		mqttStatus = "warning";
+		mqttStatus = 2;
 	} else {
-		mqttStatus = "danger";
+		mqttStatus = 3;
 	}
-	json["status"]["mqtt"] = mqttStatus;
 
-	json.createNestedObject("mqtt");
-	json["mqtt"]["lastError"] = (int) mqtt->lastError();
-
-	serializeJson(json, jsonStr);
+	char json[280];
+	snprintf_P(json, sizeof(json), DATA_JSON,
+		maxPwr == 0 ? meterState->isThreePhase() ? 20000 : 10000 : maxPwr,
+		meterConfig->productionCapacity,
+		meterConfig->mainFuse == 0 ? 32 : meterConfig->mainFuse,
+		meterState->getActiveImportPower(),
+		meterState->getActiveExportPower(),
+		meterState->getReactiveImportPower(),
+		meterState->getReactiveExportPower(),
+		meterState->getActiveImportCounter(),
+		meterState->getReactiveExportCounter(),
+		meterState->getReactiveImportCounter(),
+		meterState->getReactiveExportCounter(),
+		meterState->getL1Voltage(),
+		meterState->getL2Voltage(),
+		meterState->getL3Voltage(),
+		meterState->getL1Current(),
+		meterState->getL2Current(),
+		meterState->getL3Current(),
+		vcc,
+		rssi,
+		hw->getTemperature(),
+		(uint32_t) (now / 1000),
+		ESP.getFreeHeap(),
+		espStatus,
+		hanStatus,
+		wifiStatus,
+		mqttStatus,
+		(int) mqtt->lastError()
+	);
 
 	server.sendHeader("Cache-Control", "no-cache, no-store, must-revalidate");
 	server.sendHeader("Pragma", "no-cache");
 	server.sendHeader("Expires", "-1");
 
-	server.setContentLength(jsonStr.length());
-	server.send(200, "application/json", jsonStr);
+	server.setContentLength(strlen(json));
+	server.send(200, "application/json", json);
 }
 
 void AmsWebServer::handleSetup() {
diff --git a/web/application.js b/web/application.js
index fc56cf3e..5a24be53 100644
--- a/web/application.js
+++ b/web/application.js
@@ -219,12 +219,22 @@ $(function() {
     }
 });
 
-var setStatus = function(id, status) {
+var setStatus = function(id, sid) {
     var item = $('#'+id);
     item.removeClass('d-none');
     item.removeClass (function (index, className) {
         return (className.match (/(^|\s)badge-\S+/g) || []).join(' ');
     });
+    var status;
+    if(sid == 0) {
+        status = "secondary";
+    } else if(sid == 1) {
+        status = "success";
+    } else if(sid == 2) {
+        status = "warning";
+    } else {
+        status = "danger";
+    }
     item.addClass('badge badge-' + status);
 };
 
@@ -249,150 +259,90 @@ var fetch = function() {
                 continue;
             }
             if(isNaN(str)) {
-                $('.'+id).html(str);
+                $('.j'+id).html(str);
             } else {
                 var num = parseFloat(str);
-                $('.'+id).html(num.toFixed(num < 0 ? 0 : num < 10 ? 2  : 1));
+                $('.j'+id).html(num.toFixed(num < 0 ? 0 : num < 10 ? 2  : 1));
             }
+            $('.r'+id).show();
         }
 
         if(window.moment) {
-            $('.cs').html(moment.duration(parseInt(json.uptime_seconds), 'seconds').humanize());
-            $('.cs').closest('.row').show();
+            $('.ju').html(moment.duration(parseInt(json.u), 'seconds').humanize());
         }
 
-        if(json.status) {
-            for(var id in json.status) {
-                setStatus(id, json.status[id]);
+        setStatus("esp", json.em);
+        setStatus("han", json.em == 3 ? 0 : json.hm);
+        setStatus("wifi", json.em == 3 ? 0 : json.wm);
+        setStatus("mqtt", json.em == 3 ? 0 : json.mm);
+
+
+        if(im && im.gaugeMeter) {
+            var v = parseInt(json.i);
+            var pct = (v*100)/parseInt(json.im);
+            var append = "W";
+            if(v > 1000) {
+                v = (v/1000).toFixed(1);
+                append = "kW";
             }
+            im.gaugeMeter({
+                percent: pct,
+                text: v,
+                append: append
+            });
         }
 
-        if(json.mqtt) {
+        if(em && em.gaugeMeter && json.om) {
+            var v = parseInt(json.e);
+            var pct = (v*100)/(parseInt(json.om)*1000);
+            var append = "W";
+            if(v > 1000) {
+                v = (v/1000).toFixed(1);
+                append = "kW";
+            }
+            em.gaugeMeter({
+                percent: pct,
+                text: v,
+                append: append
+            });
+        }
+
+        if(vm && vm.gaugeMeter && json.u1) {
+            var v = parseFloat(json.u1);
+            if(json.u2) {
+                v = (v+parseFloat(json.u2)+parseFloat(json.u3)) / 3;
+            }
+            var pct = (Math.max(v-207, 1)*100/46);
+            vm.gaugeMeter({
+                percent: pct,
+                text: v.toFixed(1)
+            });
+        }
+
+        if(am && am.gaugeMeter && json.i1 && json.mf) {
+            var v = parseFloat(json.i1);
+            if(json.i2) {
+                v = Math.max(v, parseFloat(json.i2));
+            }
+            if(json.i3) {
+                v = Math.max(v, parseFloat(json.i3));
+            }
+            var pct = (v*100)/parseInt(json.mf);
+            am.gaugeMeter({
+                percent: pct,
+                text: v.toFixed(1)
+            });
+        }
+
+        if(json.me) {
             $('.me').addClass('d-none');
-            $('.me'+json.mqtt.lastError).removeClass('d-none');
-            $('#ml').html(json.mqtt.lastError);
+            $('.me'+json.me).removeClass('d-none');
+            $('#ml').html(json.me);
         }
 
-        if(json.wifi) {
-            for(var id in json.wifi) {
-                var str = json.wifi[id];
-                dst = $('.'+id);
-                if(isNaN(str)) {
-                    dst.html(str);
-                } else {
-                    var num = parseFloat(str);
-                    dst.html(num.toFixed(0));
-                    $('.'+id+'-row').show();
-                }
-            }
-        }
-
-        if(json.data) {
-            var p = 0;
-            var p_pct = parseInt(json.p_pct);
-            var p_append = "W";
-            if(json.data.P) {
-                p = parseFloat(json.data.P);
-                if(p > 1000) {
-                    p = (p/1000).toFixed(1);
-                    p_append = "kW";
-                }
-            }
-            if(im && im.gaugeMeter) {
-                im.gaugeMeter({
-                    percent: p_pct,
-                    text: p,
-                    append: p_append
-                });
-            }
-
-            var po = 0;
-            var po_pct = parseInt(json.po_pct);
-            var po_append = "W";
-            if(json.data.PO) {
-                po = parseFloat(json.data.PO);
-                if(po > 1000) {
-                    po = (po/1000).toFixed(1);
-                    po_append = "kW";
-                }
-            }
-            if(em && em.gaugeMeter) {
-                em.gaugeMeter({
-                    percent: po_pct,
-                    text: po,
-                    append: po_append
-                });
-            }
-
-            var v = parseFloat(json.v);
-            if(v > 0) {
-                var v_pct = parseInt(json.v_pct);
-
-                if(vm && vm.gaugeMeter) {
-                    vm.gaugeMeter({
-                        percent: v_pct,
-                        text: v.toFixed(1)
-                    });
-                }
-            }
-
-            var a = parseFloat(json.a);
-            if(a > 0) {
-                var a_pct = parseInt(json.a_pct);
-
-                if(am && am.gaugeMeter) {
-                    am.gaugeMeter({
-                        percent: a_pct,
-                        text: a.toFixed(1)
-                    });
-                }
-            }
-
-            for(var id in json.data) {
-                var str = json.data[id];
-                if(isNaN(str)) {
-                    $('.'+id).html(str);
-                } else {
-                    var num = parseFloat(str);
-                    $('.'+id).html(num.toFixed(1));
-                    $('.'+id+'-row').show();
-                }
-            }
-
-            var temp = parseInt(json.temp);
-            if(temp == -127) {
-                $('.temp').html("N/A");
-            }
-        } else {
-            if(im && im.gaugeMeter) {
-                im.gaugeMeter({
-                    percent: 0,
-                    text: "-",
-                    append: "W"
-                });
-            }
-
-            if(em && em.gaugeMeter) {
-                em.gaugeMeter({
-                    percent: 0,
-                    text: "-",
-                    append: "W"
-                });
-            }
-
-            if(vm && vm.gaugeMeter) {
-                vm.gaugeMeter({
-                    percent: 0,
-                    text: "-"
-                });
-            }
-
-            if(am && am.gaugeMeter) {
-                am.gaugeMeter({
-                    percent: 0,
-                    text: "-"
-                });
-            }
+        var temp = parseInt(json.t);
+        if(temp == -127) {
+            $('.jt').html("N/A");
         }
         setTimeout(fetch, interval);
     }).fail(function() {
diff --git a/web/data.json b/web/data.json
new file mode 100644
index 00000000..346535a4
--- /dev/null
+++ b/web/data.json
@@ -0,0 +1,29 @@
+{
+    "im" : %d,
+    "om" : %d,
+    "mf" : %d,
+    "i" : %d,
+    "e" : %d,
+    "ri" : %d,
+    "re" : %d,
+    "ic" : %.1f,
+    "ec" : %.1f,
+    "ric" : %.1f,
+    "rec" : %.1f,
+    "u1" : %.1f,
+    "u2" : %.1f,
+    "u3" : %.1f,
+    "i1" : %.2f,
+    "i2" : %.2f,
+    "i3" : %.2f,
+    "v" : %.2f,
+    "r" : %d,
+    "t" : %.1f,
+    "u" : %lu,
+    "m" : %lu,
+    "em" : %d,
+    "hm" : %d,
+    "wm" : %d,
+    "mm" : %d,
+    "me" : %d
+}
\ No newline at end of file
diff --git a/web/index.html b/web/index.html
index 48659897..b73beb81 100644
--- a/web/index.html
+++ b/web/index.html
@@ -1,16 +1,16 @@
 <div class="bg-white rounded shadow p-1">
     <div class="row">
         <div class="col-md-3 col-6">
-            <div class="text-center">Up <span class="cs">{cs}</span></div>
+            <div class="text-center">Up <span class="ju">{cs}</span></div>
         </div>
         <div class="col-md-3 col-6">
-            <div class="text-center">Temperature: <span class="temp">{temp}</span>&deg;C</div>
+            <div class="text-center">Temperature: <span class="jt">{temp}</span>&deg;C</div>
         </div>
         <div class="col-md-3 col-6">
-            <div class="text-center">ESP volt: <span class="vcc">{vcc}</span>V</div>
+            <div class="text-center">ESP volt: <span class="jv">{vcc}</span>V</div>
         </div>
         <div class="col-md-3 col-6">
-            <div class="text-center">WiFi RSSI: <span class="rssi">{rssi}</span>dBm</div>
+            <div class="text-center">WiFi RSSI: <span class="jr">{rssi}</span>dBm</div>
         </div>
     </div>
 </div>
@@ -21,7 +21,7 @@
             <div class="col-sm-6 mt-3">
                 <div class="bg-white rounded shadow p-3">
                     <div class="text-center">
-                        <div class="SimpleMeter P" style="display: inline;">
+                        <div class="SimpleMeter ji" style="display: inline;">
                             {P} W
                         </div>
                         <div id="im" class="GaugeMeter rounded"
@@ -35,15 +35,15 @@
                             data-label="{ti}"
                         ></div>
                     </div>
-                    <div class="row tPI-row" style="display: {da};">
-                        <div class="col-12 text-right"><span class="tPI">{tPI}</span> kWh</div>
+                    <div class="row ric" style="display: {da};">
+                        <div class="col-12 text-right"><span class="jic">{tPI}</span> kWh</div>
                     </div>
                 </div>
             </div>
             <div class="col-sm-6 mt-3" style="display: {de};">
                 <div class="bg-white rounded shadow p-3">
                     <div class="text-center">
-                        <div class="SimpleMeter PO" style="display: inline;">
+                        <div class="SimpleMeter je" style="display: inline;">
                             {PO} W
                         </div>
                         <div id="em" class="GaugeMeter rounded"
@@ -57,29 +57,29 @@
                             data-label="Export"
                         ></div>
                     </div>
-                    <div class="row tPO-row" style="display: {da};">
-                        <div class="col-12 text-right"><span class="tPO">{tPO}</span> kWh</div>
+                    <div class="row rec" style="display: {da};">
+                        <div class="col-12 text-right"><span class="jec">{tPO}</span> kWh</div>
                     </div>
                 </div>
             </div>
             <div class="col-sm-6 mt-3" style="display: {dn};">
                 <div class="bg-white rounded shadow p-3" style="display: {da};">
                     <h5 class="text-center">Reactive</h5>
-                    <div class="row tQI-row">
+                    <div class="row rric">
                         <div class="col-4">In</div>
-                        <div class="col-8 text-right"><span class="tQI">{tQI}</span> kvarh</div>
+                        <div class="col-8 text-right"><span class="jric">{tQI}</span> kvarh</div>
                         <div class="col-4">Out</div>
-                        <div class="col-8 text-right"><span class="tQO">{tQO}</span> kvarh</div>
+                        <div class="col-8 text-right"><span class="jrec">{tQO}</span> kvarh</div>
                     </div>
                 </div>
             </div>
             <div class="col-sm-12 mt-3" style="display: {de};">
                 <div class="bg-white rounded shadow p-3" style="display: {da};">
-                    <div class="row tQO-row">
+                    <div class="row rrec">
                         <div class="col-4 col-sm-2">In</div>
-                        <div class="col-8 col-sm-4 text-right"><span class="tQI">{tQI}</span> kvarh</div>
+                        <div class="col-8 col-sm-4 text-right"><span class="jric">{tQI}</span> kvarh</div>
                         <div class="col-4 col-sm-2">Out</div>
-                        <div class="col-8 col-sm-4 text-right"><span class="tQO">{tQO}</span> kvarh</div>
+                        <div class="col-8 col-sm-4 text-right"><span class="jrec">{tQO}</span> kvarh</div>
                     </div>
                 </div>
             </div>
@@ -99,10 +99,10 @@
                     data-label="Volt"
                 ></div>
             </div>
-            <div class="row U2-row" style="display: {3p};">
-                <div class="col-4"><span class="U1">{U1}</span>V</div>
-                <div class="col-4 text-center"><span class="U2">{U2}</span>V</div>
-                <div class="col-4 text-right"><span class="U3">{U3}</span>V</div>
+            <div class="row ru2" style="display: {3p};">
+                <div class="col-4"><span class="ju1">{U1}</span>V</div>
+                <div class="col-4 text-center"><span class="ju2">{U2}</span>V</div>
+                <div class="col-4 text-right"><span class="ju3">{U3}</span>V</div>
             </div>
         </div>
     </div>
@@ -120,10 +120,10 @@
                     data-label="Ampere"
                 ></div>
             </div>
-            <div class="row I2-row" style="display: {3p};">
-                <div class="col-4"><span class="I1">{I1}</span>A</div>
-                <div class="col-4 text-center"><span class="I2">{I2}</span>A</div>
-                <div class="col-4 text-right"><span class="I3">{I3}</span>A</div>
+            <div class="row ru2" style="display: {3p};">
+                <div class="col-4"><span class="ji1">{I1}</span>A</div>
+                <div class="col-4 text-center"><span class="ji2">{I2}</span>A</div>
+                <div class="col-4 text-right"><span class="ji3">{I3}</span>A</div>
             </div>
         </div>
     </div>