⚡ SWM Charge Finder
Find the nearest SWM (Stadtwerke München) EV charger and start navigating with one tap – built for the Tesla in-car browser.
Live demo → https://megatony.github.io/swm-charge-finder/
Features
- One big button. "Navigate to nearest charger" reads your position and lists the three closest SWM sites; the top result opens turn-by-turn directions (Google Maps, which hands off to the car's navigation).
- Made for the car. Large touch targets, dark theme, one page plus two small scripts, a ~220 KB station file, and no frameworks, trackers or build step.
- Useful details. Each station shows its distance, max power (kW), connector types (Type 2, CCS, CHAdeMO) with counts, and its address.
- Live availability. Each station shows how many points are free, occupied, or unavailable right now, a Free now badge, and the time that status last changed. Only show free hides sites with nothing available. If the live feed is down, those details are hidden and the static list still works.
- English and Turkish. The header EN / TR toggle switches every label, including live status. English is the default. Turkish is chosen automatically when the browser language starts with
tr, and the choice is remembered on the device. Numbers and times follow the selected language.
- Fast-only filter for DC chargers at 50 kW or more.
- Manual location. Enter an address (OpenStreetMap Nominatim) or
lat, lng coordinates when GPS is unavailable or denied.
- Deep links.
?lat=48.137&lng=11.575 runs a search immediately.
- Works fully static (GitHub Pages), including live availability. An optional zero-dependency Node backend exposes the same feed on
/api/nearest and a send-to-car endpoint.
How it works
Bundesnetzagentur CSV ──► scripts/build-static.py ──► public/stations.json (621 SWM sites, 1,533 charge points)
│
Browser (public/index.html + core.js) ◄───────────────────┘ ranks by straight-line distance, client-side
│
└── GET MobiData BW OCPDB (no key, CORS *) near the user’s position
source datex2_e_clearing_net, operator SWM
match the nearest location within 50 m
AVAILABLE = free · CHARGING/BLOCKED = occupied · OUTOFORDER/UNKNOWN = unavailable
server.js (optional) ── lib/live.js LIVE_SOURCE=ocpdb (default) ──► the same OCPDB query, with a User-Agent
│ datex2 / file remain available (see Alternatives)
└── POST /api/send-nearest-to-car ──► Tesla vehicle-command proxy ──► Fleet API navigation_gps_request
- Static data build.
scripts/build-static.py reads the official charging-station register CSV, keeps operational SWM-operated sites, groups charge points by location, and fixes rows that were geocoded to the city centre. Those rows are moved to a twin entry at the same address, or dropped.
- Frontend.
public/core.js (shared with Node) ranks stations by haversine distance and optional minimum power. On GitHub Pages it all runs in the browser. Live status is a second request to MobiData BW’s Open ChargePoint DataBase, limited to a radius that covers the nearest register sites (cached for 60 seconds). e-clearing.net ids look like CO_1391, not Bundesnetzagentur EVSE ids, so a station is paired with the nearest SWM location within 50 m. REMOVED charge points are ignored. If that request fails, the page hides live badges and still lists the nearest sites.
- Backend (optional).
server.js serves the UI and GET /api/nearest. lib/live.js defaults to LIVE_SOURCE=ocpdb and sends User-Agent: swm-charge-finder/1.0 (+https://github.com/megatony/swm-charge-finder). The same 60-second cache applies. With live data, the endpoint prefers stations that have a free point.
- Send to car (planned).
POST /api/send-nearest-to-car picks the nearest (free) charger and sends it to the car's navigation through the Tesla Fleet API (navigation_gps_request, signed by Tesla's vehicle-command proxy). It hasn't been tested against a real car yet.
Quick start
Requirements: Node 18+ (no npm dependencies). Python 3 is needed only to rebuild the data.
git clone https://github.com/megatony/swm-charge-finder.git
cd swm-charge-finder
# Static only: serve public/ with anything
python3 -m http.server -d public 8080 # → http://localhost:8080
# Backend + UI
node server.js # → http://localhost:8080 (PORT to change)
curl "http://localhost:8080/api/nearest?lat=48.137&lng=11.575&limit=3&minKw=0"
# Tests
node test/test.js
# Rebuild public/stations.json from a fresh register download
# CSV: https://www.bundesnetzagentur.de/ladesaeulenkarte → "Liste der Ladesäulen (CSV)"
python3 scripts/build-static.py path/to/Ladesaeulenregister.csv
Deployment: every push to main runs the tests and publishes public/ to GitHub Pages via .github/workflows/pages.yml.
API
| Endpoint | Description |
|---|
GET /api/nearest?lat=&lng=&limit=3&minKw=0 | Nearest stations as JSON (limit ≤ 10). With a live feed (the default), only stations with a free point. Each result includes freeCount, occupiedCount, unavailableCount, and statusUpdated. |
POST /api/send-nearest-to-car?lat=&lng= | Header X-Api-Secret required. Sends the nearest station to the car via Tesla Fleet API. |
Configuration
All configuration is through environment variables (names only; never commit values):
| Variable | Purpose |
|---|
PORT | HTTP port (default 8080) |
LIVE_SOURCE | ocpdb (default, MobiData BW), datex2 (Mobilithek), file (local DATEX/OCPI JSON), or none |
MOBILITHEK_URL | Subscription URL of the Mobilithek AFIR dynamic feed |
MOBILITHEK_CERT, MOBILITHEK_KEY | Client certificate and key (PEM paths) for Mobilithek mTLS |
MOBILITHEK_PFX, MOBILITHEK_PASS | Alternative: PKCS#12 bundle path and its passphrase |
LIVE_FILE | Path to a downloaded feed when LIVE_SOURCE=file |
API_SECRET | Shared secret expected in X-Api-Secret for send-to-car |
TESLA_PROXY_URL | Base URL of Tesla's vehicle-command HTTP proxy |
TESLA_ACCESS_TOKEN | Tesla Fleet API user access token |
TESLA_VIN | Target vehicle VIN |
lib/live.js also contains googleNearbyAvailable(), an unused adapter for the Google Places API (New) evChargeOptions that needs your own API key.
Data sources & attribution
- Charging stations: Ladesäulenregister © Bundesnetzagentur.de (as of 1 September 2026), licensed under CC BY 4.0. Changes: filtered to SWM-operated sites (SWM Versorgungs GmbH, SWM Mobilität GmbH), regrouped by location, misplaced city-centre coordinates corrected or removed. The Bundesnetzagentur accepts no liability for accuracy or completeness.
- Address search: Nominatim, data © OpenStreetMap contributors (ODbL).
- Live availability: MobiData BW Open ChargePoint DataBase, republishing SWM dynamic data from e-clearing.net (
source_uid=datex2_e_clearing_net). No API key. Queried by position and radius rather than for the whole city.
- Routing: Google Maps directions links.
Known limitations
- Distances are straight-line, not driving distance.
- Live status is matched by location (same SWM operator, nearest site within 50 m), because e-clearing.net charge-point ids are SWM-internal. A register row with no OCPDB neighbour inside that distance shows “availability unknown”. Neighbouring register rows are not merged: each keeps its single nearest location, so a busy post next to a free one stays busy.
RESERVED (rare in this feed) counts as occupied. REMOVED points are left out of the counts.
Alternatives
The OCPDB feed is the one the app uses. Two older adapters are still in lib/live.js if you need them:
- Mobilithek DATEX II (
LIVE_SOURCE=datex2). A direct subscription to the Mobilithek AFIR recharging dynamic feed, with an mTLS client certificate (MOBILITHEK_URL plus MOBILITHEK_CERT/MOBILITHEK_KEY or MOBILITHEK_PFX/MOBILITHEK_PASS). That feed matches on EVSE id. Only a minority of register charge points have one (324 of 1,533), so coverage stays incomplete without an AFIR static feed. The subscription was never set up; OCPDB replaces it for day-to-day use. LIVE_SOURCE=file reads a saved DATEX II / OCPI JSON file from LIVE_FILE instead.
- Google Places (
googleNearbyAvailable()). An unused adapter for the Places API (New) evChargeOptions. It needs your own API key and a billing account.
This is an independent hobby project. It isn't affiliated with or endorsed by Stadtwerke München, Tesla, or the Bundesnetzagentur.
Roadmap
License
Code: MIT © 2026 Bahadır Akın Akgül. Station data: CC BY 4.0, Bundesnetzagentur.de.
