Platform SDK

Build on Backfill in TypeScript. Two flavors — extensions for behavior, connectors for data ingest.

The SDK is split into two surfaces:

• Extensions — defineExtension(...). Hooks, jobs, API routes, custom entities, dashboard pages, UI tabs, action buttons. The default flavor; reach for it for anything that augments Backfill’s existing behavior.
• Connectors — defineConnector(...). Third-party data integrations with first-class support for streams, signed webhooks, and the canonical ingest pipeline. Reach for it when your job is bringing data in.

Both share the same file/folder layout, the same standard-library globals, and the same deploy lifecycle. A connector is just an extension with extra connector-shaped manifest entries.

If you’re new, start with Get started and the Quickstart, then read Concepts end-to-end.

• Get started

  Install the CLI, scaffold an extension, and ship your first hook.

• Concepts

  How extensions plug into Backfill — glossary, standard library, script types, events, and runtime.

• Extensions

  Anatomy of an extension — the manifest, file layout, and one article per global and script type.

• Connectors

  Build third-party data integrations with defineConnector — streams, webhooks, and connection setup.

• Guides

  End-to-end walkthroughs for the most common extension shapes.