// the find
plaid/pattern
An example end-to-end Plaid integration to create items and fetch transaction data
Official Plaid sample app showing a full personal finance manager: link bank accounts via Plaid Link, sync transactions via webhooks, display spending by category. It's a teaching tool, not a starter template — the README says as much. Useful if you're evaluating whether to build on Plaid or figuring out exactly how the token exchange and webhook flow are supposed to work.
Webhook-driven transaction sync is done correctly — it uses the transactions sync endpoint on SYNC_UPDATES_AVAILABLE rather than polling, which is the right pattern. The server explicitly guards against duplicate institution linkages and explains why (cost). Access tokens and item IDs are correctly kept server-side only, never exposed to the client. The persona-based sandbox users (user_yuppie, user_small_business) are a nice touch for realistic testing.
ngrok session expiry silently breaks webhooks for previously-linked items with no in-app warning — you'll chase a ghost bug your first time. The server uses plain node-postgres query strings scattered across route files with no ORM or query builder, so the SQL is fragile and hard to audit. Session management is a simple username/password with no auth library, which is fine for a demo but easy to accidentally copy into production. No tests of any kind — the webhook handler and transaction sync logic are completely untested.