Fetch recent Fly.io app logs programmatically over HTTP
domain: fly.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Have a Fly access token with read access to the app (fly auth token / personal access token).
Call GET /api/v1/apps/{app_name}/logs with `Authorization: <token>` (header) on Fly's internal API that flyctl uses.
The response is a JSON:API document: a `data` array of log entries plus `meta.next_token` cursor.
Defaults return the most recent 100 log lines from the last 24 hours.
Use query params: `region` (3-letter code), `instance` (machine id), and `next_token` (a nanosecond Unix timestamp) to page or backfill.
Known gotchas
This endpoint is Fly's internal/unadvertised API (flyctl depends on it) — mostly stable but not officially supported for external use; the documented path is the `fly logs` CLI.
`next_token` is a NANOSECOND Unix timestamp and replaces the old `start_time` (ISO 8601) param — using start_time no longer works.
Only the HTTP option gives access to historical logs (retention ~7 days); NATS and log shipper only see logs from connection time.
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