Full PostGIS in WASM
Spatial queries run locally in the browser — no network round-trip. ST_Area, ST_Intersects, spatial joins, everything PostGIS supports.
datum
Local-first spatial sync for PostGIS.
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What it looks like
ts
import { DatumClient } from 'datum-sync'
const db = await DatumClient.connect({
serverUrl: 'ws://localhost:3000/ws',
bbox: [-122.5, 37.7, -122.4, 37.8],
})
// Full PostGIS — runs locally in WASM, no network
const result = await db.query<{ name: string; area: number }>(`
SELECT properties->>'name' AS name,
ST_Area(geom::geography) AS area
FROM features
WHERE ST_Area(geom::geography) > 1000
`)
// Writes are captured automatically and synced in the background
await db.query(
`INSERT INTO features (geom, properties, updated_at)
VALUES (ST_SetSRID(ST_MakePoint($1, $2), 4326), $3::jsonb, now())`,
[lng, lat, JSON.stringify({ name: 'Field site A' })]
)