JustRouting Python Client

Official Python client for the JustRouting API — routing, distance matrices, and vehicle routing optimization across Southeast Asia.

No dependencies outside the standard library. Requires Python 3.9+.

Install

pip install justrouting

Or install from a clone of this repository:

pip install -e .

import justrouting

Quickstart

import justrouting

client = justrouting.Client("YOUR_API_KEY")

route = client.routes.get(
    justrouting.RouteRequest(
        origin=[103.708362, 1.357371],
        destination=[103.984748, 1.352212],
    ),
    timeout=30,
)

print(f"Distance: {route.distance / 1000:.1f} km")

The coordinates above are Singapore and Kuala Lumpur, which span two countries. See Coordinates must share a country — the runnable examples use same-country pairs.

Services

A Client exposes four services.

Routes

Routes.get returns the best route. Routes.get_all additionally returns alternatives and the snapped input waypoints.

route = client.routes.get(justrouting.RouteRequest(
    origin=[103.8198, 1.3521],
    destination=[103.9915, 1.3644],
    waypoints=[[103.8514, 1.2897]],   # stops in order
    overview="full",                  # full geometry
    steps=True,                       # turn-by-turn
))

print(route.distance)  # metres
print(route.duration)  # seconds

route.geometry holds whichever encoding you asked for:

polyline = route.geometry.polyline()  # default, and "polyline6"
line = route.geometry.geojson()       # when geometries="geojson"

Matrix

Travel time and distance between many points at once.

m = client.matrix.get(justrouting.MatrixRequest(
    coordinates=[depot, stop_a, stop_b],
    sources=[0],            # only the depot row; cheaper than N×N
    destinations=[1, 2],
))

seconds = m.duration(0, 1)
if seconds is not None:
    print(f"depot -> stopA: {seconds / 60:.0f} min")

The accessors return None for unreachable pairs. The API reports those as null, which is deliberately kept distinct from a genuine zero.

Optimization

Assign tasks to a fleet and order each vehicle's stops.

solution = client.optimization.solve(justrouting.OptimizationRequest(
    vehicles=[justrouting.Vehicle(
        id=1, start=depot, end=depot, capacity=[4],
    )],
    jobs=[
        justrouting.Job(id=1, location=stop_a, delivery=[1], service=300),
        justrouting.Job(id=2, location=stop_b, delivery=[2], service=300),
    ],
))

for route in solution.routes:
    print(f"vehicle {route.vehicle}: {len(route.steps)} stops")
print(len(solution.unassigned), "task(s) could not be served")

Use Shipments instead of Jobs for pickup-and-delivery pairs that must be served in order by the same vehicle.

Health

The only call that works without an API key, which makes it a useful connectivity check.

health = client.health.get()
print(health.ok(), health.upstreams)

Error handling

Every failure raises a subclass of justrouting.Error. Classify it with except clauses rather than matching on message text:

try:
    route = client.routes.get(req)
except justrouting.QuotaExceededError:
    # daily allowance used up — retrying will not help
except justrouting.RateLimitedError:
    # throttled; the client already retried
except justrouting.CrossCountryError:
    # coordinates span more than one country
except justrouting.NoRouteError:
    # no road connects these points

Exception	Meaning
UnauthorizedError	API key missing, invalid, or revoked
RateLimitedError	Throttled (per-second limit or daily quota)
QuotaExceededError	Daily quota exhausted; retrying will not help (subclasses RateLimitedError)
PlanLimitExceededError	Too many matrix coordinates, jobs, or vehicles
CrossCountryError	Coordinates span more than one country
InvalidCoordinatesError	Coordinate malformed or out of range
NoRouteError	No route exists between the points
UpstreamUnavailableError	Routing engine unreachable; usually transient
InvalidRequestError	Rejected locally before any request was sent

Catch justrouting.Error itself when you need the status code, engine code, or raw body:

except justrouting.Error as e:
    print(f"HTTP {e.status_code}: {e.message}")
    print(e.body)  # raw response body, truncated

Failures that never produced an API response raise TransportError (network-level, retried like a 5xx) or DecodeError (unparseable success response) instead; neither is a subclass of Error.

Configuration

Argument	Default	Purpose
api_key	—	Sent as Authorization: Bearer on every authenticated request
base_url	https://api.justrouting.tech	Target a local or staging server
user_agent	justrouting-py/<version>	Identify your application
max_retries	2	Retry budget on top of the initial attempt
backoff	500ms → 8s, jittered	Callable replacing the retry delay schedule
timeout	30	Seconds per HTTP attempt

Invalid options raise ValueError immediately. (The Go client defers them to the first request because its constructor cannot fail; Python constructors can.)

Timeouts and retries

Rate limits (429), server errors (5xx), and transport failures are retried with exponential backoff and jitter; a Retry-After header takes precedence when present. Other 4xx responses are returned immediately — they would fail identically on a retry and would still consume quota.

Client(timeout=...) covers a single HTTP attempt, like http.Client.Timeout in Go. Pass the per-call timeout argument to bound the whole retry sequence:

route = client.routes.get(req, timeout=30)  # 30s total, retries included

Proxy configuration follows the standard HTTP_PROXY / HTTPS_PROXY environment variables.

Things to know

Coordinates are [longitude, latitude]

This is the GeoJSON order, and the reverse of the "lat, lng" used by most map UIs. Swapped coordinates are usually caught locally — a longitude in the latitude slot fails the [-90, 90] check before a request is sent — but a swap that stays in range will silently route somewhere unexpected.

Point is a list subclass, so both of these work:

origin=[103.8198, 1.3521]
origin=justrouting.Point([103.8198, 1.3521])

Coordinates must share a country

Every coordinate in a single request must fall within one country; the API routes each request to a per-country engine. A Singapore → Kuala Lumpur request fails with CrossCountryError.

Supported countries: Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Vietnam.

Plan limits

	Free	Hobby
Requests per day	100	10,000
Requests per second	5	10
Matrix coordinates	100	500
Jobs per optimization	100	1,000
Vehicles per optimization	10	50

Exceeding a size limit raises PlanLimitExceededError; exhausting the daily allowance raises QuotaExceededError.

Examples

Runnable scripts live in examples/:

export JUSTROUTING_API_KEY=<your key>
python examples/route.py
python examples/matrix.py
python examples/optimization.py

Development

pip install -e '.[dev]'
pytest

The default suite runs entirely against local http.server instances — no network access and no API key.

Integration tests hit a live API and are behind a marker, so they never run by accident:

pytest -m integration                          # health and auth only
JUSTROUTING_API_KEY=<key> pytest -m integration
JUSTROUTING_BASE_URL=http://localhost:8080 pytest -m integration

Differences from the Go client

• Exceptions replace sentinel errors and errors.Is; QuotaExceededError subclasses RateLimitedError.
• Constructor options are keyword arguments; invalid ones raise ValueError immediately instead of being deferred to the first request.
• There is no context.Context; the per-call timeout argument plays the role of a context deadline.
• Matrix accessors return float | None instead of (float, ok).
• There is no custom-HTTP-client option; use base_url, timeout, and the standard proxy environment variables instead.

License

MIT