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Use it to cut a boundary down before a call whose cost is vertex-driven -- POST /v1/pip caps on points times polygon vertices, and POST /v1/geometry/buffer and the overlay ops cap at 2000 positions -- and to shrink what you store or draw. The response reports outputVertices next to inputVertices, so the saving is measurable before you spend again. The algorithm is Douglas-Peucker. Send toleranceMeters for a ground tolerance applied isotropically: both axes are scaled to metres at the input's centre latitude first, so at 70 deg N the simplification is not three times as aggressive east-west as north-south, which a raw degree tolerance makes it. Send tolerance instead for the raw degree tolerance if you want turf's behaviour unchanged. Retained vertices come back exactly as sent rather than round-tripped through the scaling. Not topology-preserving: adjacent polygons simplified separately can gap or overlap along a shared edge. Input is EPSG:4326 only. 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It does not preserve topology: adjacent polygons simplified separately can gap or overlap along a shared edge."],"geojson":{"type":"Feature","geometry":{"type":"LineString","coordinates":[[-150,61],[-149.9,61.002]]},"properties":null},"inputVertices":5,"outputVertices":2,"toleranceMeters":100,"toleranceDegrees":{"latitude":0.00089743142433687,"longitude":0.0018482314669043616}}}},"schema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","oneOf":[{"required":["toleranceMeters"]},{"required":["tolerance"]}],"required":["geojson"],"properties":{"geojson":{"type":"object","description":"A GeoJSON Feature, FeatureCollection or Geometry in EPSG:4326, longitude then latitude in degrees. 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