Support uploading .geojson files directly

A .geojson file needs no GPX/FIT conversion — it's already the shape
gpx.js expects — so GpxStore#geojson now just reads and returns it
as-is, no cache sidecar. save/tree/the upload dropzone and its zip
handling all pick it up through the existing TRACK_EXTENSIONS list.

Also fixes a bug the new "cached" tree icon would have shipped with:
a GPX/FIT's own .geojson cache sidecar (e.g. "ride.gpx.geojson") also
matches the new .geojson branch in list_children, which would have
listed it as a second, phantom tree entry — excluded explicitly, with
a regression test.

app.rb

@@ -169,8 +169,8 @@ module Maptool
     end
 
     # A .zip (Garmin's bulk/FIT export format) is expanded into its
-    # .gpx/.fit entries instead of being stored itself — nothing downstream
-    # (tree listing, map rendering) knows what to do with a zip.
+    # .gpx/.fit/.geojson entries instead of being stored itself — nothing
+    # downstream (tree listing, map rendering) knows what to do with a zip.
     post "/api/gpx" do
       require_login!
       file = params[:file]

docs/architecture.adoc

@@ -221,11 +221,11 @@ This is a live, online-only overlay — it always needs internet access
 and is unrelated to the offline PMTiles basemap above. Per RainViewer's
 terms, the API is free for personal/non-commercial use.
 
-== GPX/FIT tracks and waypoints
+== GPX/FIT/GeoJSON tracks and waypoints
 
 The "Tracks" map control (`public/js/gpx.js`) opens a side panel to
-upload GPX or FIT files by dragging them in, organize them into
-folders (also by dragging), and toggle each one on the map
+upload GPX, FIT or GeoJSON files by dragging them in, organize them
+into folders (also by dragging), and toggle each one on the map
 individually.
 
 Storage:: Files are stored as-is under `data/gpx/`, in a
@@ -243,13 +243,18 @@ which the panel renders recursively (folders as `<details>`, files as
 a checkbox, both with a delete button).
 
 Drag & drop:: The dropzone at the top of the panel accepts one or more
-`.gpx`/`.fit` files, or a `.zip` (`POST /api/gpx`, multipart) into the
-top level, or click it to browse instead. A `.zip` — Garmin's bulk/FIT
-export format — isn't stored itself: `save_zip_entries` (`app.rb`)
-expands it with `rubyzip` and saves each `.gpx`/`.fit` entry it
-contains individually (flattened — any folder structure inside the
-zip is discarded), skipping anything else (readme files, etc.) it
-might hold. An already-uploaded file (a
+`.gpx`/`.fit`/`.geojson` files, or a `.zip` (`POST /api/gpx`,
+multipart) into the top level, or click it to browse instead. A
+`.geojson` file needs no format conversion — it's already the shape
+`gpx.js` expects — so `GpxStore#geojson` just serves it straight from
+disk (see "Rendering" below); useful for a file already in this app's
+own schema, e.g. one exported elsewhere in that shape, or a previous
+`GET /api/gpx/file` response saved and re-uploaded. A `.zip` —
+Garmin's bulk/FIT export format — isn't stored itself:
+`save_zip_entries` (`app.rb`) expands it with `rubyzip` and saves each
+`.gpx`/`.fit`/`.geojson` entry it contains individually (flattened —
+any folder structure inside the zip is discarded), skipping anything
+else (readme files, etc.) it might hold. An already-uploaded file (a
 `.gpx-tree__file` row, `draggable`) can be dragged onto a folder to
 move it there (`POST /api/gpx/move`), or dropped anywhere else in the
 tree to move it back to the top level; an OS file can also be dropped
@@ -269,8 +274,18 @@ know which format it got. `GpxStore#geojson` caches that conversion
 alongside the source file (`<path>.geojson`, invalidated by mtime) —
 REXML parsing a several-thousand-waypoint POI export (a park4night
 area export, say) can take tens of seconds, and without a cache that
-cost repeats on every single toggle rather than just the first one
-after a save. `Gpx` parses the GPX with REXML: `<wpt>`
+cost repeats on every single toggle. `GpxStore#save` also calls
+`geojson` itself right after writing the file, so that cost is paid
+once during the upload (covered by the frontend's own "Uploading…"
+status) instead of on whichever toggle happens to be first — a silent
+multi-second hang on a checkbox click reads as broken in a way the
+same wait during an upload doesn't. A file that fails to parse still
+saves fine either way; the error just surfaces on first view instead.
+A `.geojson` upload skips this path entirely — `geojson` reads and
+returns it directly, no cache file, no `Gpx`/`Fit` involved; the file
+tree's cached-file icon (`GEOJSON_ICON`, `public/js/icons.js`) always
+shows for one, since there's no conversion step it could ever be
+waiting on. `Gpx` parses the GPX with REXML: `<wpt>`
 waypoints become `Point` features (with `name`, `desc` and `time`
 carried through as properties), each `<trk>` becomes one
 `MultiLineString` feature (one line per `<trkseg>`), and each `<rte>`
@@ -409,7 +424,8 @@ Like the radar overlay, GPX layers are removed by `map.setStyle()`
 whichever files were checked.
 
 Waypoint popups:: Clicking a waypoint badge opens a MapLibre popup
-with its name, category (if any), description and time. Click/hover handling is
+with its name, category (if any), photos (if any), description and
+time. Click/hover handling is
 registered once per file (via `map.on(type, layerId, handler)`, a
 delegated listener that survives `setStyle()`) rather than on every
 `style.load` re-add, which would otherwise stack duplicate handlers
@@ -436,6 +452,16 @@ before, one paragraph with line breaks. So this only ever adds
 structure on top of recognized lines; it never loses or hides text from
 files that don't have any.
 +
+A newer p4n2gpx export also emits one plain GPX `<link href>` per
+listing photo (not a vendor extension like `waypoint_style`'s
+`<osmand:*>` — `<link>` is base GPX 1.1, any number allowed per
+`<wpt>`/`<trk>`/`<rte>`). `Gpx.waypoint_photos` collects their `href`s
+into a `photos` property; `formatPhotos` renders them as a row of
+64px thumbnails above the description, each linking to the full-size
+image in a new tab. A plain GPS waypoint or an older export has none,
+so the row just doesn't render — same "only ever adds, never assumes"
+approach as the description formatting above.
++
 `Services`/`Activities` get one further step (`formatMetaRow`,
 `formatTags`): the value is park4night's own comma-separated codes
 (`animaux, point_eau, wc_public`), which on their own told a reader

lib/maptool/geojson.rb

@@ -0,0 +1,18 @@
+module Maptool
+  # A directly-uploaded .geojson file needs no conversion — GpxStore serves
+  # it straight from disk (see GpxStore#geojson) — so unlike Gpx/Fit there's
+  # no to_geojson here. Only kind-detection lives here, for the tree's badge
+  # icons, mirroring Gpx.kinds' cheap substring-search rather than a full
+  # JSON parse: a POI export can be tens of MB, geojson or not, and a full
+  # parse just to answer "does this have any points/lines" would cost the
+  # same either way.
+  module Geojson
+    def self.kinds(path)
+      content = File.read(path)
+      kinds = []
+      kinds << "waypoint" if content.include?('"Point"')
+      kinds << "track" if content.include?('"LineString"') # matches MultiLineString too
+      kinds
+    end
+  end
+end

lib/maptool/gpx.rb

@@ -51,11 +51,21 @@ module Maptool
           "category" => child_text(wpt, "type"),
           "color" => ext[:color],
           "icon" => ext[:icon],
+          "photos" => waypoint_photos(wpt),
         },
       }
     end
     private_class_method :waypoint_feature
 
+    # <link> is plain GPX 1.1 (a wpt/trk/rte can carry any number of them),
+    # not a vendor extension like waypoint_style's <osmand:*> — a newer
+    # p4n2gpx export started emitting one per park4night listing photo. A
+    # plain GPS waypoint has none, so this is almost always empty.
+    def self.waypoint_photos(wpt)
+      wpt.get_elements("link").filter_map { |link| link.attributes["href"] }
+    end
+    private_class_method :waypoint_photos
+
     OSMAND_NAMESPACE = "https://osmand.net"
     private_constant :OSMAND_NAMESPACE
 

lib/maptool/gpx_store.rb

@@ -2,6 +2,7 @@ require "fileutils"
 require "json"
 require_relative "gpx"
 require_relative "fit"
+require_relative "geojson"
 
 module Maptool
   # Filesystem-backed store for uploaded GPX/FIT files, organized in
@@ -22,7 +23,10 @@ module Maptool
     end
 
     # Nested { type:, name:, path:, children: } hash describing every
-    # folder and .gpx/.fit file under the store root.
+    # folder and .gpx/.fit file under the store root. Each file also
+    # carries "cached" — whether its GeoJSON conversion is ready on disk
+    # (see `geojson` below) — so the tree UI can show a file's ready to
+    # view instantly, without a round trip just to find out.
     def tree
       { "type" => "folder", "name" => "root", "path" => "", "children" => list_children(@root, "") }
     end
@@ -30,12 +34,26 @@ module Maptool
     # Saves `io`'s contents as a .gpx/.fit file under `folder` (created if
     # needed), deriving a safe filename from `filename`. Returns the
     # stored file's path relative to the store root.
+    #
+    # Converts to GeoJSON and caches it right away (see `geojson` below)
+    # rather than waiting for the first time someone checks the file's box —
+    # a several-thousand-waypoint POI export is slow enough to parse that
+    # doing it lazily meant the *first* toggle silently hung (indistinguishable
+    # from broken), instead of the upload's own "Uploading…" status covering
+    # that wait like it already does for the upload itself. A file that fails
+    # to parse still saves fine — same as before, it just surfaces the error
+    # on first view instead of here.
     def save(folder:, filename:, io:)
       dir = resolve_dir(folder.to_s)
       FileUtils.mkdir_p(dir)
       name = unique_filename(dir, safe_filename(filename))
       File.binwrite(File.join(dir, name), io.read)
       relative = folder.to_s.empty? ? name : "#{folder}/#{name}"
+      begin
+        geojson(relative)
+      rescue Gpx::ParseError, Fit::ParseError
+        nil
+      end
       relative
     end
 
@@ -93,12 +111,17 @@ module Maptool
     # can take tens of seconds, every single time the file is toggled
     # visible. Cached alongside the source file and invalidated by mtime,
     # so only the first read after a save (or edit) pays that cost.
+    #
+    # A directly-uploaded .geojson file skips all of this — it's already in
+    # the shape gpx.js expects, so there's nothing to convert or cache;
+    # it's just read and served as-is.
     def geojson(relative_path)
       path = resolve_file(relative_path)
       raise Errno::ENOENT, path unless File.file?(path)
+      return File.read(path) if path.downcase.end_with?(".geojson")
 
       cache = geojson_cache_path(path)
-      if !File.file?(cache) || File.mtime(cache) < File.mtime(path)
+      unless geojson_cached?(path)
         data = path.downcase.end_with?(".fit") ? Fit.to_geojson(path) : Gpx.to_geojson(path)
         File.write(cache, JSON.generate(data))
       end
@@ -122,7 +145,16 @@ module Maptool
       "#{path}.geojson"
     end
 
-    TRACK_EXTENSIONS = %w[.gpx .fit].freeze
+    # A .geojson source needs no separate cache file — it already is the
+    # target format, so it's always "ready".
+    def geojson_cached?(path)
+      return true if path.downcase.end_with?(".geojson")
+
+      cache = geojson_cache_path(path)
+      File.file?(cache) && File.mtime(cache) >= File.mtime(path)
+    end
+
+    TRACK_EXTENSIONS = %w[.gpx .fit .geojson].freeze
 
     def safe_filename(filename)
       base = File.basename(filename.to_s)
@@ -151,9 +183,15 @@ module Maptool
         if File.directory?(full)
           { "type" => "folder", "name" => entry, "path" => rel, "children" => list_children(full, rel) }
         elsif entry.downcase.end_with?(".gpx")
-          { "type" => "file", "name" => entry, "path" => rel, "kinds" => Gpx.kinds(full) }
+          { "type" => "file", "name" => entry, "path" => rel, "kinds" => Gpx.kinds(full), "cached" => geojson_cached?(full) }
         elsif entry.downcase.end_with?(".fit")
-          { "type" => "file", "name" => entry, "path" => rel, "kinds" => Fit.kinds(full) }
+          { "type" => "file", "name" => entry, "path" => rel, "kinds" => Fit.kinds(full), "cached" => geojson_cached?(full) }
+        # A GPX/FIT's own cache sidecar (e.g. "ride.gpx.geojson", written by
+        # `geojson` above) also ends in ".geojson" — excluded here so it
+        # doesn't show up as a second, phantom tree entry next to the file
+        # it was derived from.
+        elsif entry.downcase.end_with?(".geojson") && !entry.downcase.end_with?(".gpx.geojson", ".fit.geojson")
+          { "type" => "file", "name" => entry, "path" => rel, "kinds" => Geojson.kinds(full), "cached" => true }
         end
       end
     end

public/css/style.css

@@ -582,6 +582,21 @@ html, body {
   line-height: 1.4;
 }
 
+.gpx-popup__photos {
+  display: flex;
+  gap: 4px;
+  margin: 4px 0;
+  overflow-x: auto;
+}
+
+.gpx-popup__photo {
+  width: 64px;
+  height: 64px;
+  flex-shrink: 0;
+  object-fit: cover;
+  border-radius: 4px;
+}
+
 .gpx-popup__meta {
   margin-top: 8px;
   padding-top: 6px;

public/js/gpx.js

@@ -6,6 +6,7 @@ import {
   WAYPOINT_ICON,
   TRACK_ICON,
   ROUTE_ICON,
+  GEOJSON_ICON,
   MAP_MARKER_ICON,
   POI_ICONS,
   PARK4NIGHT_TAGS,
@@ -276,6 +277,7 @@ export class GpxPanelControl {
     name.title = file.name;
     label.appendChild(checkbox);
     (file.kinds || []).forEach((kind) => label.appendChild(this._kindIcon(kind)));
+    if (file.cached) label.appendChild(this._cachedIcon());
     label.appendChild(name);
     row.appendChild(label);
     row.appendChild(this._deleteButton(() => this._deleteFile(file.path)));
@@ -299,6 +301,14 @@ export class GpxPanelControl {
     return icon;
   }
 
+  _cachedIcon() {
+    const icon = document.createElement("span");
+    icon.className = "gpx-tree__kind-icon";
+    icon.innerHTML = GEOJSON_ICON;
+    icon.title = "Ready to view instantly (GeoJSON cached)";
+    return icon;
+  }
+
   _deleteButton(onClick) {
     const button = document.createElement("button");
     button.type = "button";
@@ -610,9 +620,12 @@ export class GpxPanelControl {
 
   async _uploadFiles(fileList, folder) {
     // .zip: Garmin's bulk/FIT export format — the server expands it into
-    // its .gpx/.fit entries, so it's accepted here even though the tree
-    // never shows a .zip itself.
-    const files = [...fileList].filter((file) => /\.(gpx|fit|zip)$/i.test(file.name));
+    // its .gpx/.fit/.geojson entries, so it's accepted here even though the
+    // tree never shows a .zip itself. .geojson needs no server-side
+    // conversion (GpxStore#geojson serves it as-is) — accepted here so a
+    // file already in this app's own shape (e.g. a previous /api/gpx/file
+    // response, saved and re-uploaded) can skip GPX/FIT entirely.
+    const files = [...fileList].filter((file) => /\.(gpx|fit|geojson|zip)$/i.test(file.name));
     if (files.length === 0) return;
 
     this._setStatus(files.length === 1 ? "Uploading…" : `Uploading ${files.length} files…`);
@@ -754,10 +767,11 @@ function gpxFileUrl(path) {
 
 // properties come straight from an uploaded GPX file — untrusted input —
 // so every value is escaped before landing in the popup's HTML.
-function popupHtml({ name, description, time, category }) {
+function popupHtml({ name, description, time, category, photos }) {
   const parts = [];
   if (name) parts.push(`<strong>${escapeHtml(name)}</strong>`);
   if (category) parts.push(`<p class="gpx-popup__category">${escapeHtml(category)}</p>`);
+  if (photos?.length > 0) parts.push(formatPhotos(photos));
   if (description) parts.push(formatDescription(description));
   if (time) {
     const parsed = new Date(time);
@@ -808,6 +822,22 @@ function escapeHtml(text) {
 const DESCRIPTION_META_LINE = /^(Rating|Services|Activities):\s*(.+)$/i;
 const DESCRIPTION_LINK_LINE = /^https?:\/\/\S+$/;
 
+// <link> photo URLs (a newer p4n2gpx export adds one per park4night listing
+// photo — see lib/maptool/gpx.rb's waypoint_photos) as a row of thumbnails,
+// each opening the full-size image in a new tab. Untrusted URLs from an
+// uploaded file, same as everywhere else in this popup — escaped for use as
+// both an href and an img src.
+function formatPhotos(photos) {
+  const thumbs = photos
+    .map((url) => escapeHtml(url))
+    .map(
+      (url) =>
+        `<a href="${url}" target="_blank" rel="noopener noreferrer"><img class="gpx-popup__photo" src="${url}" loading="lazy" alt=""></a>`,
+    )
+    .join("");
+  return `<div class="gpx-popup__photos">${thumbs}</div>`;
+}
+
 function formatDescription(description) {
   const body = [];
   const meta = [];

public/js/icons.js

@@ -54,6 +54,16 @@ export const WAYPOINT_ICON = `
 
 export const TRACK_ICON = GPX_ICON;
 
+// Shown next to a file whose GeoJSON conversion is already cached on disk
+// (GpxStore#geojson) — ready to view instantly instead of paying REXML's
+// parse cost on click. Curly braces read as "structured data ready", the
+// same shorthand most editors/tools use for JSON.
+export const GEOJSON_ICON = `
+<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round">
+  <path d="M9 4c-1.5 0-2 .8-2 2v3c0 1-.5 1.5-1.5 1.5 1 0 1.5.5 1.5 1.5v3c0 1.2.5 2 2 2"/>
+  <path d="M15 4c1.5 0 2 .8 2 2v3c0 1 .5 1.5 1.5 1.5-1 0-1.5.5-1.5 1.5v3c0 1.2-.5 2-2 2"/>
+</svg>`;
+
 // Same shape as TRACK_ICON, dashed — a route is planned rather than
 // recorded, the same visual convention most map apps use for the
 // distinction.

test/fixtures/sample_poi.gpx

@@ -20,4 +20,9 @@
       <locus:icon xmlns:locus="http://www.locusmap.eu">res/drawable-hdpi/ic_parking_small.png</locus:icon>
     </extensions>
   </wpt>
+  <wpt lat="48.103" lon="17.203">
+    <name>With photos</name>
+    <link href="https://cdn3.park4night.com/lieu/1_100/1_gd.jpg"><text>Photo</text></link>
+    <link href="https://cdn3.park4night.com/lieu/1_100/2_gd.jpg"><text>Photo</text></link>
+  </wpt>
 </gpx>

test/test_app.rb

@@ -60,6 +60,18 @@ class AppTest < Minitest::Test
     assert_operator track["properties"]["distance_meters"], :>, 0
   end
 
+  def test_geojson_upload_is_served_back_unchanged
+    content = '{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"kind":"waypoint","name":"Spot"},"geometry":{"type":"Point","coordinates":[17.1,48.1]}}]}'
+    response = post_file("/api/gpx", filename: "spots.geojson", content: content, env: logged_in_env)
+
+    assert_equal 200, response.status
+    assert_equal ["spots.geojson"], json_body(response)["paths"]
+
+    file_response = request.get("/api/gpx/file/spots.geojson")
+    assert_equal 200, file_response.status
+    assert_equal "Spot", json_body(file_response)["features"][0]["properties"]["name"]
+  end
+
   def test_unparseable_gpx_returns_422
     post_file("/api/gpx", filename: "bad.gpx", content: "<gpx><trk unclosed>", env: logged_in_env)
 

test/test_gpx.rb

@@ -74,6 +74,18 @@ class GpxTest < Minitest::Test
     assert_nil plain["properties"]["icon"]
   end
 
+  def test_waypoint_captures_link_hrefs_as_photos
+    geojson = Maptool::Gpx.to_geojson(fixture_path("sample_poi.gpx"))
+    with_photos = geojson["features"].find { |f| f["properties"]["name"] == "With photos" }
+    plain = geojson["features"].find { |f| f["properties"]["name"] == "Plain waypoint" }
+
+    assert_equal(
+      ["https://cdn3.park4night.com/lieu/1_100/1_gd.jpg", "https://cdn3.park4night.com/lieu/1_100/2_gd.jpg"],
+      with_photos["properties"]["photos"]
+    )
+    assert_empty plain["properties"]["photos"]
+  end
+
   def test_kinds_detects_routes
     assert_equal ["route"], Maptool::Gpx.kinds(fixture_path("sample_route.gpx"))
   end

test/test_gpx_store.rb

@@ -68,20 +68,26 @@ class GpxStoreTest < Minitest::Test
     assert_empty @store.tree["children"].reject { |c| c["name"] == "archive" }
   end
 
-  def test_geojson_is_cached_alongside_the_source_file
+  def test_save_eagerly_caches_the_geojson_conversion
     path = @store.save(folder: "", filename: "ride.gpx", io: StringIO.new(sample_gpx))
     cache_path = @store.resolve_file(path) + ".geojson"
-    refute File.file?(cache_path)
-
-    first = @store.geojson(path)
     assert File.file?(cache_path)
 
-    # Corrupt the cache directly to prove the second call reused it instead
-    # of re-parsing the (still-valid) source file.
+    first = @store.geojson(path)
+
+    # Corrupt the cache directly to prove the call above reused it instead of
+    # re-parsing the (still-valid) source file.
     File.write(cache_path, first.sub("waypoint", "cached-waypoint"))
     assert_includes @store.geojson(path), "cached-waypoint"
   end
 
+  def test_save_of_an_unparseable_file_still_succeeds
+    path = @store.save(folder: "", filename: "bad.gpx", io: StringIO.new("not gpx at all"))
+
+    refute File.file?(@store.resolve_file(path) + ".geojson")
+    assert_raises(Maptool::Gpx::ParseError) { @store.geojson(path) }
+  end
+
   def test_geojson_cache_is_invalidated_when_the_file_is_resaved
     path = @store.save(folder: "", filename: "ride.gpx", io: StringIO.new(sample_gpx))
     @store.geojson(path)
@@ -115,6 +121,59 @@ class GpxStoreTest < Minitest::Test
     assert_raises(Errno::ENOENT) { @store.geojson("nope.gpx") }
   end
 
+  def test_tree_reports_cached_true_after_a_successful_save
+    @store.save(folder: "", filename: "ride.gpx", io: StringIO.new(sample_gpx))
+
+    file = @store.tree["children"].find { |c| c["name"] == "ride.gpx" }
+    assert file["cached"]
+  end
+
+  def test_tree_reports_cached_false_for_an_unparseable_file
+    @store.save(folder: "", filename: "bad.gpx", io: StringIO.new("not gpx at all"))
+
+    file = @store.tree["children"].find { |c| c["name"] == "bad.gpx" }
+    refute file["cached"]
+  end
+
+  def test_tree_reports_cached_false_once_the_source_is_resaved
+    path = @store.save(folder: "", filename: "ride.gpx", io: StringIO.new(sample_gpx))
+    FileUtils.touch(@store.resolve_file(path) + ".geojson", mtime: Time.now - 10)
+    File.write(@store.resolve_file(path), sample_gpx)
+    FileUtils.touch(@store.resolve_file(path), mtime: Time.now)
+
+    file = @store.tree["children"].find { |c| c["name"] == "ride.gpx" }
+    refute file["cached"]
+  end
+
+  def test_geojson_extension_is_preserved_not_forced_to_gpx
+    path = @store.save(folder: "", filename: "spots.geojson", io: StringIO.new(sample_geojson))
+    assert_equal "spots.geojson", path
+  end
+
+  def test_uploaded_geojson_is_served_as_is_with_no_cache_file
+    path = @store.save(folder: "", filename: "spots.geojson", io: StringIO.new(sample_geojson))
+
+    assert_equal sample_geojson, @store.geojson(path)
+    refute File.file?(@store.resolve_file(path) + ".geojson"), "a .geojson source needs no separate cache sidecar"
+  end
+
+  def test_uploaded_geojson_is_always_reported_cached
+    @store.save(folder: "", filename: "spots.geojson", io: StringIO.new(sample_geojson))
+
+    file = @store.tree["children"].find { |c| c["name"] == "spots.geojson" }
+    assert file["cached"]
+    assert_equal ["waypoint"], file["kinds"]
+  end
+
+  # A GPX/FIT's own GeoJSON cache sidecar (e.g. "ride.gpx.geojson") also
+  # ends in ".geojson" — regression test for it not showing up as its own
+  # second, phantom tree entry alongside "ride.gpx".
+  def test_geojson_cache_sidecar_is_not_listed_as_its_own_tree_entry
+    @store.save(folder: "", filename: "ride.gpx", io: StringIO.new(sample_gpx))
+
+    assert_equal ["ride.gpx"], @store.tree["children"].map { |c| c["name"] }
+  end
+
   private
 
   def sample_gpx
@@ -122,4 +181,8 @@ class GpxStoreTest < Minitest::Test
       <gpx><wpt lat="48.1" lon="17.1"><name>Waypoint</name></wpt></gpx>
     GPX
   end
+
+  def sample_geojson
+    '{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"kind":"waypoint","name":"Spot"},"geometry":{"type":"Point","coordinates":[17.1,48.1]}}]}'
+  end
 end

views/index.erb

@@ -48,12 +48,12 @@
     <strong>Tracks</strong>
     <div class="gpx-panel__actions">
       <button type="button" class="gpx-panel__action" data-action="new-folder" title="New folder" aria-label="New folder"></button>
-      <button type="button" class="gpx-panel__action" data-action="upload" title="Upload GPX/FIT file" aria-label="Upload GPX/FIT file"></button>
+      <button type="button" class="gpx-panel__action" data-action="upload" title="Upload GPX/FIT/GeoJSON file" aria-label="Upload GPX/FIT/GeoJSON file"></button>
       <button type="button" class="gpx-panel__close" aria-label="Close">&times;</button>
     </div>
   </div>
 
-  <input type="file" class="gpx-file-input" accept=".gpx,.fit,.zip" multiple hidden>
+  <input type="file" class="gpx-file-input" accept=".gpx,.fit,.geojson,.zip" multiple hidden>
   <p class="gpx-upload__status" hidden></p>
 
   <div class="gpx-tree"></div>