diff --git a/IotWebConf.code-workspace b/IotWebConf.code-workspace
index fadc025..3cd0ab8 100644
--- a/IotWebConf.code-workspace
+++ b/IotWebConf.code-workspace
@@ -4,56 +4,61 @@
 			"path": "."
 		},
 		{
-			"path": "examples-pio/IotWebConf01Minimal"
+			"path": "../IotWebConf-examples/IotWebConf01Minimal"
 		},
 		{
-			"path": "examples-pio/IotWebConf02StatusAndReset"
+			"path": "../IotWebConf-examples/IotWebConf02StatusAndReset"
 		},
 		{
-			"path": "examples-pio/IotWebConf03CustomParameters"
+			"path": "../IotWebConf-examples/IotWebConf03CustomParameters"
 		},
-        {
-            "path": "examples-pio/IotWebConf03TypedParameters"
-        },
 		{
-			"path": "examples-pio/IotWebConf04UpdateServer"
+			"path": "../IotWebConf-examples/IotWebConf03TypedParameters"
 		},
 		{
-			"path": "examples-pio/IotWebConf05Callbacks"
+			"path": "../IotWebConf-examples/IotWebConf04UpdateServer"
 		},
 		{
-			"path": "examples-pio/IotWebConf06MqttApp"
+			"path": "../IotWebConf-examples/IotWebConf05Callbacks"
 		},
 		{
-			"path": "examples-pio/IotWebConf07MqttRelay"
+			"path": "../IotWebConf-examples/IotWebConf06MqttApp"
 		},
 		{
-			"path": "examples-pio/IotWebConf08WebRelay"
+			"path": "../IotWebConf-examples/IotWebConf07MqttRelay"
 		},
 		{
-			"path": "examples-pio/IotWebConf09CustomConnection"
+			"path": "../IotWebConf-examples/IotWebConf08WebRelay"
 		},
 		{
-			"path": "examples-pio/IotWebConf10CustomHtml"
+			"path": "../IotWebConf-examples/IotWebConf09CustomConnection"
 		},
 		{
-			"path": "examples-pio/IotWebConf11AdvancedRuntime"
+			"path": "../IotWebConf-examples/IotWebConf10CustomHtml"
 		},
 		{
-			"path": "examples-pio/IotWebConf12CustomParameterType"
+			"path": "../IotWebConf-examples/IotWebConf11AdvancedRuntime"
 		},
 		{
-			"path": "examples-pio/IotWebConf13OptionalGroup"
+			"path": "../IotWebConf-examples/IotWebConf12CustomParameterType"
 		},
 		{
-			"path": "examples-pio/IotWebConf14GroupChain"
+			"path": "../IotWebConf-examples/IotWebConf13OptionalGroup"
 		},
 		{
-			"path": "examples-pio/IotWebConf15MultipleWifi"
+			"path": "../IotWebConf-examples/IotWebConf14GroupChain"
 		},
 		{
-			"path": "examples-pio/IotWebConf16OffLineMode"
+			"path": "../IotWebConf-examples/IotWebConf15MultipleWifi"
 		},
+		{
+			"path": "../IotWebConf-examples/IotWebConf16OffLineMode"
+		},
+		{
+			"path": "../IotWebConf-examples/IotWebConf17JsonConfig"
+		}
 	],
-	"settings": {}
-}
\ No newline at end of file
+	"settings": {
+		"workbench.tree.indent": 16
+	}
+}
diff --git a/examples/IotWebConf17JsonConfig/README.txt b/examples/IotWebConf17JsonConfig/README.txt
new file mode 100644
index 0000000..198e136
--- /dev/null
+++ b/examples/IotWebConf17JsonConfig/README.txt
@@ -0,0 +1,31 @@
+Example: Load config from JSON file on FS
+Description:
+  This example is based on the "03 Custom Parameters" example.
+  The idea is that we prepare a configuration file located
+  in the flash filesystem. When this file exists, it is loaded
+  into the IotWebConf parameters and the changes are saved.
+  The used config file is then deleted from the flash FS.
+  NOTE! JSON support is not available by default, you need to
+  enable it with the IOTWEBCONF_ENABLE_JSON compile time directive.
+  Please read further sections for more details!
+  Please compare this source code with "03 Custom Parameters"!
+
+Using this example:
+  This example is intended to be used under PlatformIO, as PIO
+  provides compile time configurations and FS upload capabilities.
+  With PlatformIO you must use "build_flags = -DIOTWEBCONF_ENABLE_JSON"
+  as seen in the "platformio.ini".
+
+Preparing configuration file:
+  You can find a "config.json" file in the "data" subfolder
+  containing the example values. Your project must contains
+  this "data" folder. Use PlatformIOs "Build file system image"
+  and "Upload file system image" to upload the config.json to the
+  flash area. The file is deleted after it has been processed, so
+  you might want to re-upload it several times while testing this
+  example.
+
+Hardware setup for this example:
+  - An LED is attached to LED_BUILTIN pin with setup On=LOW.
+  - [Optional] A push button is attached to pin D2, the other leg of the
+    button should be attached to GND.
diff --git a/examples/IotWebConf17JsonConfig/data/config.json b/examples/IotWebConf17JsonConfig/data/config.json
new file mode 100644
index 0000000..cb5f5ec
--- /dev/null
+++ b/examples/IotWebConf17JsonConfig/data/config.json
@@ -0,0 +1,22 @@
+{
+    "iwcAll": {
+        "iwcSys": {
+            "iwcThingName": "nameFromJSON",
+            "iwcApPassword": "smrtTHNG8266",
+            "iwcApTimeout": "40",
+            "iwcWifi0": {
+                "iwcWifiSsid": "myNet",
+                "iwcWifiPassword": "myNetPwd"
+            },
+            "stringParam": "Value from JSON"
+        },
+        "iwcCustom": {
+            "c_factor": {
+                "checkParam": "",
+                "chooseParam": "blue"
+            }
+        },
+        "hidden": {
+        }
+    }
+}
\ No newline at end of file
diff --git a/examples/IotWebConf17JsonConfig/platformio.ini b/examples/IotWebConf17JsonConfig/platformio.ini
new file mode 100644
index 0000000..ca62865
--- /dev/null
+++ b/examples/IotWebConf17JsonConfig/platformio.ini
@@ -0,0 +1,32 @@
+[common]
+build_flags =
+  -DIOTWEBCONF_ENABLE_JSON
+lib_deps =
+  bblanchon/ArduinoJson
+  IotWebConf
+
+[env:d1_mini]
+platform = espressif8266
+board = d1_mini
+framework = arduino
+board_build.filesystem = littlefs
+monitor_speed = 115200
+build_flags =
+  ${common.build_flags}
+;upload_port = /dev/cu.SLAB_USBtoUART
+lib_deps =
+  ${common.lib_deps}
+
+[env:d1_mini32]
+platform = espressif32
+board = wemos_d1_mini32
+framework = arduino
+board_build.filesystem = littlefs
+monitor_speed = 115200
+build_flags =
+  ${common.build_flags}
+;monitor_port = /dev/cu.SLAB_USBtoUART
+;upload_port = /dev/cu.SLAB_USBtoUART
+lib_deps =
+  ${common.lib_deps}
+  lorol/LittleFS_esp32
diff --git a/examples/IotWebConf17JsonConfig/src/main.cpp b/examples/IotWebConf17JsonConfig/src/main.cpp
new file mode 100644
index 0000000..9580250
--- /dev/null
+++ b/examples/IotWebConf17JsonConfig/src/main.cpp
@@ -0,0 +1,209 @@
+/**
+ * IotWebConf17JsonConfig.ino -- IotWebConf is an ESP8266/ESP32
+ *   non blocking WiFi/AP web configuration library for Arduino.
+ *   https://github.com/prampec/IotWebConf 
+ *
+ * Copyright (C) 2021 Balazs Kelemen <prampec+arduino@gmail.com>
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+/**
+ * Please read description in README.txt!
+ */
+
+#include <IotWebConf.h>
+#include <IotWebConfUsing.h> // This loads aliases for easier class names.
+#ifndef ESP32
+# include <LittleFS.h>
+#else
+# include <LITTLEFS.h>
+# define LittleFS LITTLEFS
+#endif
+#include <ArduinoJson.h>
+
+#ifndef IOTWEBCONF_ENABLE_JSON
+# error platformio.ini must contain "build_flags = -DIOTWEBCONF_ENABLE_JSON"
+#endif
+
+// -- Initial name of the Thing. Used e.g. as SSID of the own Access Point.
+const char thingName[] = "testThing";
+
+// -- Initial password to connect to the Thing, when it creates an own Access Point.
+const char wifiInitialApPassword[] = "smrtTHNG8266";
+
+#define STRING_LEN 128
+#define NUMBER_LEN 32
+
+// -- Configuration specific key. The value should be modified if config structure was changed.
+#define CONFIG_VERSION "dem2"
+
+// -- When CONFIG_PIN is pulled to ground on startup, the Thing will use the initial
+//      password to buld an AP. (E.g. in case of lost password)
+#define CONFIG_PIN D2
+
+// -- Status indicator pin.
+//      First it will light up (kept LOW), on Wifi connection it will blink,
+//      when connected to the Wifi it will turn off (kept HIGH).
+#define STATUS_PIN LED_BUILTIN
+
+// -- File name on the filesystem containing the configuration in JSON format.
+#define CONFIG_FILE_NAME "config.json"
+
+// -- Method declarations.
+void handleRoot();
+void readConfigFile();
+// -- Callback methods.
+void configSaved();
+bool formValidator(iotwebconf::WebRequestWrapper* webRequestWrapper);
+
+DNSServer dnsServer;
+WebServer server(80);
+
+char stringParamValue[STRING_LEN];
+char intParamValue[NUMBER_LEN];
+char floatParamValue[NUMBER_LEN];
+char checkboxParamValue[STRING_LEN];
+char chooserParamValue[STRING_LEN];
+
+static char chooserValues[][STRING_LEN] = { "red", "blue", "darkYellow" };
+static char chooserNames[][STRING_LEN] = { "Red", "Blue", "Dark yellow" };
+
+IotWebConf iotWebConf(thingName, &dnsServer, &server, wifiInitialApPassword, CONFIG_VERSION);
+// -- You can also use namespace formats e.g.: iotwebconf::TextParameter
+IotWebConfTextParameter stringParam = IotWebConfTextParameter("String param", "stringParam", stringParamValue, STRING_LEN);
+IotWebConfParameterGroup group1 = IotWebConfParameterGroup("group1", "");
+IotWebConfNumberParameter intParam = IotWebConfNumberParameter("Int param", "intParam", intParamValue, NUMBER_LEN, "20", "1..100", "min='1' max='100' step='1'");
+// -- We can add a legend to the separator
+IotWebConfParameterGroup group2 = IotWebConfParameterGroup("c_factor", "Calibration factor");
+IotWebConfNumberParameter floatParam = IotWebConfNumberParameter("Float param", "floatParam", floatParamValue, NUMBER_LEN,  nullptr, "e.g. 23.4", "step='0.1'");
+IotWebConfCheckboxParameter checkboxParam = IotWebConfCheckboxParameter("Check param", "checkParam", checkboxParamValue, STRING_LEN,  true);
+IotWebConfSelectParameter chooserParam = IotWebConfSelectParameter("Choose param", "chooseParam", chooserParamValue, STRING_LEN, (char*)chooserValues, (char*)chooserNames, sizeof(chooserValues) / STRING_LEN, STRING_LEN);
+
+void setup() 
+{
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println("Starting up...");
+
+  group1.addItem(&intParam);
+  group2.addItem(&floatParam);
+  group2.addItem(&checkboxParam);
+  group2.addItem(&chooserParam);
+
+  iotWebConf.setStatusPin(STATUS_PIN);
+  iotWebConf.setConfigPin(CONFIG_PIN);
+  iotWebConf.addSystemParameter(&stringParam);
+  iotWebConf.addParameterGroup(&group1);
+  iotWebConf.addParameterGroup(&group2);
+  iotWebConf.setConfigSavedCallback(&configSaved);
+  iotWebConf.setFormValidator(&formValidator);
+  iotWebConf.getApTimeoutParameter()->visible = true;
+
+  // -- Initializing the configuration.
+  bool validConfig = iotWebConf.init();
+  // -- Reading the config file. You might want to limit this when
+  //     no there is no validConfig in the EEPROM.
+  readConfigFile();
+
+  // -- Set up required URL handlers on the web server.
+  server.on("/", handleRoot);
+  server.on("/config", []{ iotWebConf.handleConfig(); });
+  server.onNotFound([](){ iotWebConf.handleNotFound(); });
+
+  Serial.println("Ready.");
+}
+
+void loop() 
+{
+  // -- doLoop should be called as frequently as possible.
+  iotWebConf.doLoop();
+}
+
+/**
+ * Handle web requests to "/" path.
+ */
+void handleRoot()
+{
+  // -- Let IotWebConf test and handle captive portal requests.
+  if (iotWebConf.handleCaptivePortal())
+  {
+    // -- Captive portal request were already served.
+    return;
+  }
+  String s = "<!DOCTYPE html><html lang=\"en\"><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1, user-scalable=no\"/>";
+  s += "<title>IotWebConf 17 Json Config</title></head><body>Hello world!";
+  s += "<ul>";
+  s += "<li>String param value: ";
+  s += stringParamValue;
+  s += "<li>Int param value: ";
+  s += atoi(intParamValue);
+  s += "<li>Float param value: ";
+  s += atof(floatParamValue);
+  s += "<li>CheckBox selected: ";
+//  s += checkboxParam.isChecked();
+  s += "<li>Option selected: ";
+  s += chooserParamValue;
+  s += "</ul>";
+  s += "Go to <a href='config'>configure page</a> to change values.";
+  s += "</body></html>\n";
+
+  server.send(200, "text/html", s);
+}
+
+void configSaved()
+{
+  Serial.println("Configuration was updated.");
+}
+
+bool formValidator(iotwebconf::WebRequestWrapper* webRequestWrapper)
+{
+  Serial.println("Validating form.");
+  bool valid = true;
+
+/*
+  int l = webRequestWrapper->arg(stringParam.getId()).length();
+  if (l < 3)
+  {
+    stringParam.errorMessage = "Please provide at least 3 characters for this test!";
+    valid = false;
+  }
+*/
+  return valid;
+}
+
+void readConfigFile()
+{
+  LittleFS.begin();
+  File configFile = LittleFS.open(CONFIG_FILE_NAME, "r");
+  if (configFile)
+  {
+    Serial.println(F("Reading config file"));
+    StaticJsonDocument<512> doc;
+
+    DeserializationError error = deserializeJson(doc, configFile);
+    configFile.close();
+
+    if (error)
+    {
+      Serial.println(F("Failed to read file, using default configuration"));
+      return;
+    }
+    JsonObject documentRoot = doc.as<JsonObject>();
+
+    // -- Apply JSON configuration.
+    iotWebConf.getRootParameterGroup()->loadFromJson(documentRoot);
+    iotWebConf.saveConfig();
+
+    // -- Remove file after finished loading it.
+    LittleFS.remove(CONFIG_FILE_NAME);
+  }
+  else
+  {
+    Serial.println(F("Config file not found, skipping."));
+  }
+  
+  LittleFS.end();
+}
+
diff --git a/pio/build-pioexamples.sh b/pio/build-pioexamples.sh
index 5fb26f6..991e968 100644
--- a/pio/build-pioexamples.sh
+++ b/pio/build-pioexamples.sh
@@ -4,7 +4,11 @@
 # compatible folder structure.
 # Build will stop on any error.
 #
-cd ../examples-pio || exit 1
+baseDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )"/.. &> /dev/null && pwd )"
+examplespio="../IotWebConf-examples"
+target="${baseDir}/${examplespio}"
+
+cd ${target} || exit 1
 
 for example in IotWebConf*; do
   echo "Compiling ${example}"
diff --git a/pio/clean-pioexamples.sh b/pio/clean-pioexamples.sh
index f78f571..bdea68e 100644
--- a/pio/clean-pioexamples.sh
+++ b/pio/clean-pioexamples.sh
@@ -6,9 +6,19 @@
 #   platformio.ini files will be removed alog with any additional added
 #   files.
 #
-cd ../examples-pio || exit 1
+baseDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )"/.. &> /dev/null && pwd )"
+examplespio="../IotWebConf-examples"
+target="${baseDir}/${examplespio}"
+
+echo "Removing contents of ${target}"
+cd ${target} || exit 1
 
 for example in IotWebConf*; do
-  echo "Removing pio example ${example}"
+  echo " - ${example}"
+  rm -rf ${example}/.pio
+  rm -rf ${example}/lib
   rm -rf ${example} || exit $?
-done
\ No newline at end of file
+done
+
+cd ..
+rmdir ${target}
\ No newline at end of file
diff --git a/pio/prepare-pioexamples.sh b/pio/prepare-pioexamples.sh
index 463b5e9..fafe9e5 100644
--- a/pio/prepare-pioexamples.sh
+++ b/pio/prepare-pioexamples.sh
@@ -6,26 +6,33 @@
 #   folder.
 # The output of this script can be added to the workspace of Visual Studio Code.
 #
-conf=`pwd`
-examplespio="examples-pio"
-target=`pwd`"/../${examplespio}"
+baseDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )"/.. &> /dev/null && pwd )"
+examplespio="../IotWebConf-examples"
+target="${baseDir}/${examplespio}"
 test -e ${target} || mkdir ${target}
 
-cd ../examples
+cd ${baseDir}/examples
 for example in IotWebConf*; do
-  if [ ! -e "$target/$example" ]; then
+  if [ ! -e "${target}/$example" ]; then
     mkdir "$target/$example"
-    mkdir "$target/$example/src"
-    mkdir "$target/$example/lib"
-    if [ -e "$example/pio/platformio.ini" ]; then
-      cp "$example/pio/platformio.ini" "$target/$example/platformio.ini"
+    if [ -e "$example/platformio.ini" ]; then
+      for f in ${baseDir}/examples/$example/*; do
+        fb="$(basename -- $f)"
+        ln -s "${baseDir}/examples/$example/$fb" "$target/$example/"
+      done
     else
-      cp "$conf/platformio-template.ini" "$target/$example/platformio.ini"
+      mkdir "$target/$example/src"
+      if [ -e "$example/pio/platformio.ini" ]; then
+        cp -R "$example/pio/"* "$target/$example/"
+      else
+        cp "${baseDir}/pio/platformio-template.ini" "$target/$example/platformio.ini"
+      fi
+      ln -s "${baseDir}/examples/$example/$example.ino" "$target/$example/src/main.cpp"
     fi
-    ln -s "../../../examples/$example/$example.ino" "$target/$example/src/main.cpp"
-    ln -s "../../.." "$target/$example/lib/IotWebConf"
+    mkdir "$target/$example/lib"
+    ln -s "${baseDir}" "$target/$example/lib/IotWebConf"
     echo "		{"
     echo "			\"path\": \"${examplespio}/$example\""
     echo "		},"
   fi
-done
\ No newline at end of file
+done
diff --git a/src/IotWebConf.h b/src/IotWebConf.h
index 4f04301..ae7739c 100644
--- a/src/IotWebConf.h
+++ b/src/IotWebConf.h
@@ -497,6 +497,10 @@ class IotWebConf
    * Normally you don't need to access these parameters directly.
    * Note, that changing valueBuffer of these parameters should be followed by saveConfig()!
    */
+  ParameterGroup* getRootParameterGroup()
+  {
+    return &this->_allParameters;
+  };
   ParameterGroup* getSystemParameterGroup()
   {
     return &this->_systemParameters;
diff --git a/src/IotWebConfParameter.cpp b/src/IotWebConfParameter.cpp
index 4305fda..83aa153 100644
--- a/src/IotWebConfParameter.cpp
+++ b/src/IotWebConfParameter.cpp
@@ -175,6 +175,33 @@ void ParameterGroup::debugTo(Stream* out)
   }
 }
 
+#ifdef IOTWEBCONF_ENABLE_JSON
+void ParameterGroup::loadFromJson(JsonObject jsonObject)
+{
+  if (jsonObject.containsKey(this->getId()))
+  {
+#ifdef IOTWEBCONF_DEBUG_TO_SERIAL
+  Serial.print(F("Applying values from JSON for groupId: "));
+  Serial.println(this->getId());
+#endif
+    JsonObject myObject = jsonObject[this->getId()];
+    ConfigItem* current = this->_firstItem;
+    while (current != nullptr)
+    {
+      current->loadFromJson(myObject);
+      current = current->_nextItem;
+    }
+  }
+  else
+  {
+#ifdef IOTWEBCONF_DEBUG_TO_SERIAL
+    Serial.print(F("Group data not found in JSON. Skipping groupId: "));
+    Serial.println(this->getId());
+#endif
+  }
+}
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 
 Parameter::Parameter(
@@ -232,6 +259,28 @@ void Parameter::clearErrorMessage()
 {
     this->errorMessage = nullptr;
 }
+#ifdef IOTWEBCONF_ENABLE_JSON
+void Parameter::loadFromJson(JsonObject jsonObject)
+{
+  if (jsonObject.containsKey(this->getId()))
+  {
+#ifdef IOTWEBCONF_DEBUG_TO_SERIAL
+  Serial.print(F("Applying value from JSON for parameterId: "));
+  Serial.println(this->getId());
+#endif
+    const char* value = jsonObject[this->getId()];
+    this->update(String(value));
+  }
+  else
+  {
+#ifdef IOTWEBCONF_DEBUG_TO_SERIAL
+  Serial.print(F("No value found in JSON for parameterId: "));
+  Serial.println(this->getId());
+#endif
+  }
+}
+#endif
+
 
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/src/IotWebConfParameter.h b/src/IotWebConfParameter.h
index 5568d7e..1f83691 100644
--- a/src/IotWebConfParameter.h
+++ b/src/IotWebConfParameter.h
@@ -17,6 +17,10 @@
 #include <IotWebConfSettings.h>
 #include <IotWebConfWebServerWrapper.h>
 
+#ifdef IOTWEBCONF_ENABLE_JSON
+# include <ArduinoJson.h>
+#endif
+
 const char IOTWEBCONF_HTML_FORM_GROUP_START[] PROGMEM =
   "<fieldset id='{i}'><legend>{b}</legend>\n";
 const char IOTWEBCONF_HTML_FORM_GROUP_END[] PROGMEM =
@@ -109,6 +113,13 @@ class ConfigItem
    */
   virtual void debugTo(Stream* out) = 0;
 
+#ifdef IOTWEBCONF_ENABLE_JSON
+  /**
+   * 
+   */
+  virtual void loadFromJson(JsonObject jsonObject) = 0;
+#endif
+
 protected:
   ConfigItem(const char* id) { this->_id = id; };
 
@@ -126,6 +137,9 @@ class ParameterGroup : public ConfigItem
   void addItem(ConfigItem* configItem);
   const char *label;
   void applyDefaultValue() override;
+#ifdef IOTWEBCONF_ENABLE_JSON
+  virtual void loadFromJson(JsonObject jsonObject) override;
+#endif
 
 protected:
   int getStorageSize() override;
@@ -187,6 +201,9 @@ class Parameter : public ConfigItem
 
   int getLength() { return this->_length; }
   void applyDefaultValue() override;
+#ifdef IOTWEBCONF_ENABLE_JSON
+  virtual void loadFromJson(JsonObject jsonObject) override;
+#endif
 
 protected:
   // Overrides