Get a Railway volume instance's details (mount path, size, state) via GraphQL
domain: docs.railway.com · 3 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Export `RAILWAY_TOKEN` and POST to https://backboard.railway.com/graphql/v2 with the bearer token.
Run: `query volumeInstance($id: String!){ volumeInstance(id: $id){ id mountPath currentSizeMB state volume{ id name } serviceInstance{ serviceName } } }` with variables {"id":"<volume-instance-id>"}.
Interpret fields: mountPath is the container path, currentSizeMB is current used size, state reflects lifecycle, volume.id/name is the parent volume, serviceInstance.serviceName identifies the attached service.
Known gotchas
A volume instance is the volume scoped to a specific environment; the id differs from the parent volume id.
currentSizeMB is used storage, not provisioned capacity; a brand-new volume reports some used MB (~2-3% metadata overhead).
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