diff --git a/api/json.php b/api/json.php
new file mode 100644
index 0000000..d736282
--- /dev/null
+++ b/api/json.php
@@ -0,0 +1,173 @@
+<?php
+
+/**
+ * BlueWeather
+ *
+ * PHP version 7.2
+ *
+ * @param locId
+ * @param range   (range[from]: from UNIX time; range[to]: to UNIX time)
+ * @param maxVals (maximum measvals to be transmitted; if more are present in the timespan, the avarage will be calculated)
+ *
+ * @category Tools
+ * @package  BlueWeather
+ * @author   Dorian Zedler <dorian@itsblue.de>
+ * @license  GPLV3 gpl.com
+ * @link     itsblue.de
+ */
+
+require_once './config.php';
+
+
+
+header('Content-Type: application/json');
+header('Access-Control-Allow-Origin: *');
+
+$con = mysqli_connect($config['dbhost'], $config['dbuser'], $config['dbpassword'], $config['dbname']);
+if (!$con) {
+    echo "<h1>Fatal internal Error! :-/</h1>";
+    echo "Error connecting to database: " . mysqli_connect_error();
+    http_response_code(500);
+    exit();
+}
+
+if (isset($_GET['locId'])) {
+    // get data of given location
+    $locId = $con->real_escape_string($_GET['locId']);
+    $range['from'] = $con->real_escape_string($_GET['range']['from']);
+    $range['to'] = $con->real_escape_string($_GET['range']['to']);
+    $maxVals = $con->real_escape_string($_GET['maxVals']);
+
+    $sql = "SELECT * FROM `locations`
+    WHERE`id`=$locId";
+    $result = $con->query($sql);
+
+    // only one row will be returned
+    $data = $result->fetch_assoc();
+
+    if (!isset($range['from']) || $range['from'] === "") {
+        $range['from'] = time() - 24 * 60 * 60;
+    }
+
+    if (!isset($range['to']) || $range['to'] === "") {
+        $range['to'] = time();
+    }
+
+    // get all measvalues of given location
+    $sql = "SELECT M.measvalue,M.sensorid,M.timestamp FROM measvalues M
+    JOIN sensors S ON M.sensorid = S.id
+    JOIN locations L ON S.locationid=L.id
+    WHERE L.id=$locId AND M.timestamp > " . $range['from'] . " AND M.timestamp < " . $range['to'] . "
+    ORDER BY timestamp ASC";
+
+    $result = $con->query($sql);
+
+    while ($row = $result->fetch_assoc()) {
+        $measvalues[] = $row;
+    }
+
+    // get all sensors of given location
+    $sql = "SELECT * FROM `sensors`
+    WHERE `locationid` = $locId";
+
+    $result = $con->query($sql);
+
+    //loop through the returned data
+    while ($row = $result->fetch_assoc()) {
+        unset($row['locationid']); // remove locId as it is redundant
+        $sensors[] = $row;
+    }
+
+    // get all value types
+    $sql = "SELECT * FROM `valuetypes`";
+
+    $result = $con->query($sql);
+
+    //loop through the returned data
+    while ($row = $result->fetch_assoc()) {
+        foreach ($sensors as $sensor) {
+            if ($sensor['valuetypeid'] == $row['id']) {
+                $valuetypes[] = $row;
+                break;
+            }
+        }
+    }
+
+    if (isset($maxVals) && $maxVals > 0 && count($measvalues) > $maxVals) {
+        // build the new measvalues array with respect to maxVals for each sensor
+
+        $finalMeasvals = array();
+
+        foreach ($sensors as $sensor) {
+
+
+            $rawMeasvalsOfThisSensor = array();
+            $finalMeasvalsOfThisSensor = array();
+
+            foreach ($measvalues as $measvalue) {
+                if ($measvalue["sensorid"] === $sensor["id"]) {
+                    array_push($rawMeasvalsOfThisSensor, $measvalue);
+                }
+            }
+
+            $countOfValuesForAvarage = intval(round(count($rawMeasvalsOfThisSensor) / $maxVals, 0));
+
+            $takenValuesForNextSum = 0;
+            $tmpMeasvalueSum = 0;
+            $tmpTimestampSum = 0;
+
+            for ($i = 0; $i < count($rawMeasvalsOfThisSensor); $i++) {
+                $measvalue = $rawMeasvalsOfThisSensor[$i];
+                if ($measvalue["sensorid"] === $sensor["id"]) {
+                    $tmpMeasvalueSum += $measvalue["measvalue"];
+                    $tmpTimestampSum += $measvalue["timestamp"];
+                    $takenValuesForNextSum += 1;
+                }
+                if ($takenValuesForNextSum === $countOfValuesForAvarage || $i === count($rawMeasvalsOfThisSensor) - 1) {
+                    array_push($finalMeasvalsOfThisSensor, array("measvalue" => $tmpMeasvalueSum / $takenValuesForNextSum, "timestamp" => $tmpTimestampSum / $takenValuesForNextSum, "sensorid" => $sensor["id"]));
+
+                    $takenValuesForNextSum = 0;
+                    $tmpMeasvalueSum = 0;
+                    $tmpTimestampSum = 0;
+                }
+            }
+
+
+            //print_r($finalMeasvalsOfThisSensor);
+
+            $finalMeasvals = array_merge($finalMeasvals, $finalMeasvalsOfThisSensor);
+        }
+
+        $measvalues = $finalMeasvals;
+    }
+
+    // find actual range
+    $min;
+    $max;
+    foreach ($measvalues as $value) {
+        if ($value['timestamp'] < $min || !isset($min)) {
+            $min = $value['timestamp'];
+        } else if ($value['timestamp'] > $max || !isset($max)) {
+            $max = $value['timestamp'];
+        }
+    }
+
+    // add sensors and value types to data object
+    $data['measvalues'] = $measvalues;
+    $data['sensors'] = $sensors;
+    $data['valuetypes'] = $valuetypes;
+    $data['range'] = array('from' => $min, 'to' => $max);
+} else {
+    // get all locations
+    $sql = "SELECT * FROM `locations`";
+    $result = $con->query($sql);
+
+    //loop through the returned data
+    while ($row = $result->fetch_assoc()) {
+        $data[] = $row;
+    }
+}
+
+http_response_code(200);
+
+echo json_encode($data);