Data Feeds
Bring live data in over an HTTP poll, a WebSocket or a webhook push — JSON, XML or text — and fold it into the store.
From JSON payload to store paths.
A feed carries a list of field mappings. Each one reads a path out of the payload and writes it to a store path, with a guard for when the value is missing.
| Part | Meaning |
|---|---|
| from | A path into the response. Same grammar as the Binder tree: $.a.b and a[0].b both work. |
| to | The store path to write. |
| onMissing | hold — leave the previous value; blank — write an empty string; zero — write 0. |
A value counts as missing when it is undefined, null or NaN. Any missing field in a cycle marks the unit degraded, so the amber dot tells you the feed is answering but the shape has drifted.
