A map-first view of Vélib’ Métropole availability, live network changes, and seven days of station history.

Open Vélib’ Pulse →

Vélib’ Pulse is an independent, unofficial service. It is not affiliated with Vélib’ Métropole or Smovengo.

• Live availability for mechanical bikes, electric bikes, and open docks.
• Map and station search with filters, nearby stations, and station history.
• Live network updates over WebSockets without repeatedly downloading the full dataset.
• One logarithmic archive scale spanning the full seven-day history, with recent minutes expanded for precision.
• One-hour playback around any retained point, at multiple playback speeds.
• Explicit before-and-after comparison with an automatic gain-and-loss heatmap and station-level deltas.
• Shareable URLs that preserve the camera, filters, selection, archive time, and comparison.
• French and English interface with a persisted language preference.
• Light and dark map themes with responsive desktop and mobile layouts.

The project uses Bun 1.3.9. Cloudflare’s local runtime, D1 database, Durable Object, and test Turnstile credentials are configured by the repository.

bun install
cp .dev.vars.example .dev.vars
bun run db:migrate:local
bun run dev

Open http://localhost:5173. The interface remains empty until the first successful collection. Trigger one through Wrangler’s local scheduled endpoint:

curl "http://localhost:5173/cdn-cgi/handler/scheduled?cron=*+*+*+*+*"

The values in .dev.vars.example include Cloudflare’s official test-only Turnstile credentials. Never use them in production.

CI additionally verifies a fresh local migration sequence and a Wrangler deployment dry run.

Vélib’ GBFS ──▶ scheduled Worker ──▶ D1 snapshots and rollups
                         │
                         └──▶ LiveFeed Durable Object ──▶ WebSocket clients

Browser ──▶ Turnstile session ──▶ Worker API ──▶ D1
   └─────────────────────────────▶ LiveFeed WebSocket

A scheduled Worker collects the official GBFS feeds every minute. D1 stores the latest network state, compressed minute snapshots, and five-minute rollups. The Worker API serves initial state, compact archive snapshots, on-demand replay data, and station history. A hibernating Durable Object broadcasts compact changes to connected browsers while D1 remains authoritative.

Effect provides boundary validation, typed failures, services, and request workflows. Workers Static Assets serves the React, Mantine, TanStack Query, and MapLibre interface.

For the storage model, data paths, caching, and access controls, see Architecture. For production configuration, deployment, rollback, and D1 recovery, see Operations.

Production uses a D1 database, a Durable Object, two Workers Rate Limiting bindings, Turnstile, Workers Static Assets, and the velib.stanislas.cloud custom domain. It also requires the TURNSTILE_SECRET_KEY and SESSION_SIGNING_SECRET Worker secrets.

Do not deploy code that requires a schema migration before applying that migration. Follow the deployment checklist rather than invoking Wrangler directly.

Availability and station metadata come from the Vélib’ Métropole GBFS open-data feeds, published under the French Licence Ouverte 2.0. The interface shows the effective source-update time. Map data is attributed in the interface by the configured basemap provider.

The application source is available under the MIT License. Source data remains subject to the Licence Ouverte and each basemap provider’s terms.