Compute a travel time/distance matrix with the Google Maps Routes API
domain: developers.google.com · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Call `computeRouteMatrix` on the Routes API with arrays of `origins` and `destinations`.
Use a `X-Goog-FieldMask` header to request only needed fields (e.g. `originIndex,destinationIndex,duration,distanceMeters`).
Read the streamed array of route-matrix elements, each keyed by `originIndex`/`destinationIndex`.
Keep the product of origins × destinations within the per-request element limit, splitting large matrices into multiple calls.
Known gotchas
The maximum number of elements (origins × destinations) per `computeRouteMatrix` request is 625, not 2,500 — a 50×50 request exceeds the limit and is rejected.
A field mask is effectively mandatory; omitting `X-Goog-FieldMask` returns an error rather than a default full response.
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