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Open-source tools & agent skills to build the things you’re paying for.

Build routing and map-matching tools on OpenStreetMap data, using a Java library or a standalone web server.

Added 2026-10-07
Replaces
GitHub

What you can build

  • Build a form that accepts an origin and ordered stop coordinates, requests a route, and presents its distance, time, and turn-by-turn instructions.
  • Build a GPX import tool that submits traces for map matching and saves the returned road-aligned trace for review alongside the original.
  • Build an origin-and-travel-time input that requests an isochrone and displays the resulting reachable area on a map for a chosen travel mode.
  • Build a trip-search form with origin, destination, and departure time that uses GTFS-based transit routing to present the resulting journey.
  • Build a route inspection report that extracts documented path details such as road class or maximum speed and exports them with route segments.

Try this prompt

Build a small Java web application that accepts an origin and a list of ordered stop coordinates, requests a route from a locally hosted GraphHopper server, and displays the route's distance, travel time, and turn-by-turn instructions. Keep the submitted stops and returned route data available for later review, and show a clear error when a request fails. Use only documented GraphHopper interfaces; do not add commercial API dependencies or claim route optimization.

Get started

  1. Meet the runtime requirement

    The README's local web-server instructions require a JVM, specifically Java 25 or newer.

  2. Prepare the server inputs

    Follow the README's Installation section to obtain the web-service JAR, example configuration, and an OpenStreetMap PBF extract; the example uses Berlin data.

  3. Start with the documented guides

    Use the README's local server setup to open the Maps UI, then consult the linked documentation for the web API, custom models, map matching, or GTFS as needed.

License & notes

Apache-2.0The engine is Apache-2.0 licensed and can be used commercially, subject to the license terms. Self-hosting requires compute and storage for the server and map data; resource needs depend on the data and workload. The Directions API is a separate commercial offering. Model or AI costs are not applicable to the documented routing workflows; no prices are quoted.

  • This is a routing engine, not a complete dispatch or route-optimization application; route optimization is described as a separate commercial offering.
  • Self-hosting requires map data and suitable compute and storage. The README describes speed, hybrid, and flexible modes with different preparation and resource trade-offs.
  • The README says offline routing is no longer officially supported; confirm current requirements before building an offline mobile workflow.
  • Redistributing GraphHopper requires following Apache-2.0 terms, including retaining applicable notices and providing the license.

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