diff --git a/.prettierignore b/.prettierignore
index 6644623..cc6dedb 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -4,8 +4,14 @@ dist/
 yarn.lock
 .idea
 .gitignore
+.eslintignore
 .prettierignore
 .tx/
 layers/
 locales/*.json
 resources/boundaries/
+*.sh
+profiles2/
+Dockerfile
+tests/**/*.json
+tests/**/*.gpx
diff --git a/gulpfile.js b/gulpfile.js
index 6c50707..11f844b 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -71,6 +71,7 @@ var paths = {
             'js/LayersConfig.js',
             'js/router/BRouter.js',
             'js/util/*.js',
+            'js/format/*.js',
             'js/plugin/*.js',
             'js/control/*.js',
             'js/index.js',
diff --git a/js/format/Gpx.js b/js/format/Gpx.js
new file mode 100644
index 0000000..e70a3f2
--- /dev/null
+++ b/js/format/Gpx.js
@@ -0,0 +1,76 @@
+BR.Gpx = {
+    format: function (geoJson) {
+        const gpx = togpx(geoJson, {
+            featureDescription: function () {},
+        });
+        const statsComment = BR.Gpx._statsComment(geoJson);
+        const xml = '<?xml version="1.0" encoding="UTF-8"?>' + statsComment + gpx;
+        return BR.Gpx.pretty(xml, 1);
+    },
+
+    // <!-- track-length = 319 filtered ascend = 2 plain-ascend = -1 cost=533 energy=.0kwh time=44s -->
+    _statsComment: function (geoJson) {
+        const props = geoJson.features?.[0].properties;
+        if (!props) return '';
+
+        let comment = '<!--';
+        comment += ' track-length = ' + props['track-length'];
+        comment += ' filtered ascend = ' + props['filtered ascend'];
+        comment += ' plain-ascend = ' + props['plain-ascend'];
+        comment += ' cost=' + props['cost'];
+        if (props['total-energy']) {
+            // TODO 'wh'? (also for stats, see issue),
+            // see brouter OsmTrack.getFormattedEnergy
+            comment += ' energy=' + (props['total-energy'] / 3600000).toFixed(1) + 'kwh';
+        }
+        if (props['total-time']) {
+            // TODO format, e.g. total-time=14833 -> time=4h 7m 13s
+            // see brouter OsmTrack.getFormattedTime2
+            comment += ' time=' + props['total-time'] + 's';
+        }
+        comment += ' -->';
+        return comment;
+    },
+
+    // modified version of
+    // https://gist.github.com/sente/1083506#gistcomment-2254622
+    // MIT License, Copyright (c) 2016 Stuart Powers, ES6 version by Jonathan Gruber
+    pretty: function (xml, indentSize = 2) {
+        const PADDING = ' '.repeat(indentSize);
+        const newline = '\n';
+        // break into lines, keep trkpt with subelement ele in single line
+        const reg = /(>)(<)(?!ele|\/trkpt)(\/?)/g;
+        let pad = 0;
+
+        xml = xml.replace('<metadata/>', '');
+        xml = xml.replace(reg, `$1${newline}$2$3`);
+
+        let lines = xml.split(newline);
+        lines = lines.map((node, index) => {
+            let indent = 0;
+            if (node.match(/.+<\/\w[^>]*>$/)) {
+                indent = 0;
+            } else if (node.match(/^<\/\w/) && pad > 0) {
+                pad -= 1;
+            } else if (node.match(/^<\w[^>]*[^\/]>.*$/)) {
+                indent = 1;
+            } else {
+                indent = 0;
+            }
+
+            pad += indent;
+
+            return PADDING.repeat(pad - indent) + node;
+        });
+
+        for (const [i, line] of lines.entries()) {
+            // break gpx attributes into separate lines
+            if (line.includes('<gpx ')) {
+                lines[i] = line.replace(/ ([a-z:]+=")/gi, ` ${newline}${PADDING}$1`);
+                break;
+            }
+        }
+
+        return lines.join(newline);
+    },
+};
diff --git a/tests/format/Gpx.test.js b/tests/format/Gpx.test.js
new file mode 100644
index 0000000..fc780a7
--- /dev/null
+++ b/tests/format/Gpx.test.js
@@ -0,0 +1,38 @@
+BR = {};
+togpx = require('togpx');
+require('../../js/format/Gpx.js');
+
+const fs = require('fs');
+
+const geoJson = require('./data/track.json');
+const path = 'tests/format/data/';
+
+// resolve intended/accepted differences before comparing
+function adoptGpx(gpx) {
+    const creator = 'togpx';
+    const name = 'Track';
+    const newline = '\n';
+
+    gpx = gpx.replace('=.0', '=0.0');
+    gpx = gpx.replace(/creator="[^"]*"/, `creator="${creator}"`);
+    gpx = gpx.replace(`creator="${creator}" version="1.1"`, `version="1.1" \n creator="${creator}"`);
+    gpx = gpx.replace(/<trk>\n  <name>[^<]*<\/name>/, `<trk>\n  <name>${name}</name>`);
+    gpx = gpx
+        .split(newline)
+        .map((line) => line.replace(/lon="([^"]*)" lat="([^"]*)"/, 'lat="$2" lon="$1"'))
+        .join(newline);
+    gpx = gpx.replace(/0"><ele>/g, '"><ele>');
+    gpx = gpx.replace('</gpx>\n', '</gpx>');
+
+    return gpx;
+}
+
+function read(fileName) {
+    return adoptGpx(fs.readFileSync(path + fileName, 'utf8'));
+}
+
+test('simple track', () => {
+    const brouterGpx = read('track.gpx');
+    const gpx = BR.Gpx.format(geoJson);
+    expect(gpx).toEqual(brouterGpx);
+});
diff --git a/tests/format/data/track.gpx b/tests/format/data/track.gpx
new file mode 100644
index 0000000..8091802
--- /dev/null
+++ b/tests/format/data/track.gpx
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- track-length = 319 filtered ascend = 2 plain-ascend = -1 cost=533 energy=.0kwh time=44s -->
+<gpx 
+ xmlns="http://www.topografix.com/GPX/1/1" 
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+ xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd" 
+ creator="BRouter-1.6.1" version="1.1">
+ <trk>
+  <name>Track</name>
+  <trkseg>
+   <trkpt lon="8.467714" lat="49.488115"><ele>101.5</ele></trkpt>
+   <trkpt lon="8.468340" lat="49.488794"><ele>101.5</ele></trkpt>
+   <trkpt lon="8.468586" lat="49.488698"><ele>101.5</ele></trkpt>
+   <trkpt lon="8.468743" lat="49.488636"><ele>101.5</ele></trkpt>
+   <trkpt lon="8.469161" lat="49.488473"><ele>101.75</ele></trkpt>
+   <trkpt lon="8.469971" lat="49.488151"><ele>103.5</ele></trkpt>
+   <trkpt lon="8.470610" lat="49.488842"><ele>99.75</ele></trkpt>
+  </trkseg>
+ </trk>
+</gpx>
diff --git a/tests/format/data/track.json b/tests/format/data/track.json
new file mode 100644
index 0000000..6c8902f
--- /dev/null
+++ b/tests/format/data/track.json
@@ -0,0 +1,40 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {
+        "creator": "BRouter-1.1",
+        "name": "Track",
+        "track-length": "319",
+        "filtered ascend": "2",
+        "plain-ascend": "-1",
+        "total-time": "44",
+        "total-energy": "4412",
+        "cost": "533",
+        "voicehints": [
+          [1,5,0],
+          [5,2,0]
+        ],
+        "messages": [
+          ["Longitude", "Latitude", "Elevation", "Distance", "CostPerKm", "ElevCost", "TurnCost", "NodeCost", "InitialCost", "WayTags", "NodeTags"],
+          ["8468340", "49488794", "101", "89", "1000", "0", "0", "0", "0", "highway=residential surface=asphalt cycleway=lane oneway=yes lcn=yes smoothness=good route_bicycle_icn=yes route_bicycle_ncn=yes route_bicycle_rcn=yes", ""],
+          ["8470671", "49488909", "99", "230", "1150", "0", "180", "0", "0", "highway=residential surface=asphalt oneway=yes smoothness=good", ""]
+        ]
+      },
+      "geometry": {
+        "type": "LineString",
+        "coordinates": [
+          [8.467714, 49.488115, 101.5],
+          [8.468340, 49.488794, 101.5],
+          [8.468586, 49.488698, 101.5],
+          [8.468743, 49.488636, 101.5],
+          [8.469161, 49.488473, 101.75],
+          [8.469971, 49.488151, 103.5],
+          [8.470610, 49.488842, 99.75]
+        ]
+      }
+    }
+  ]
+}
+