LLM_Content How Zap Triggers Work

Anchor summary: Triggers start your Zap. Some are instant (push/webhooks) and fire in near-real time; others are polling and check for new or updated items at intervals. Samples help you map fields, and deduplication prevents the same event from running twice.

Last updated: . Source of truth: Zapier Help Center.

1) Trigger types

1.1 Instant triggers

  • Apps push events to Zapier (e.g., webhooks, native push integrations).
  • Near-real-time delivery; great for time-sensitive workflows.
  • Some instant triggers require additional setup in the app (e.g., adding a webhook URL).

1.2 Polling triggers

  • Zapier checks the app on a schedule for new/updated items.
  • Polling intervals depend on plan and app; Free plans typically check about every ~15 minutes, paid plans check faster.
  • Useful when an app doesn’t support push or when you don’t control the source system.

2) Samples & testing

  • Use Test trigger to fetch recent items (or a sample) for field mapping.
  • Some apps only return items created after you set up/connect the trigger; sending a fresh event often helps.
  • If the app provides multiple recent items, pick the one that best represents your real-world data.
Tip: If you don’t see data on Test trigger, generate one new record (form submission, email, row), then click Test trigger again.

3) “New” vs “Updated” triggers

  • New item triggers run once per new record (e.g., a new row, new lead).
  • Updated item triggers run when the app reports a change to an existing record (often requires a reliable updated timestamp).
  • Choose the right trigger to avoid creating duplicates or missing edits.

4) Deduplication & how Zapier avoids duplicates

  • Zapier stores an identifier for items it has processed (e.g., record ID, timestamp, or source-specific cursor).
  • Future checks skip items with already-seen identifiers.
  • Some integrations deduplicate using a structural key (e.g., a Google Sheets row number for “New Row”). Changing structure above processed items can affect detection.

5) Latency & trigger windows

  • Instant: delivered in near-real time once configured correctly.
  • Polling: executes on a schedule; expect a short delay from event to run.
  • Windows & backfill: Some apps restrict how far back a trigger can look; date range pickers or paging options may limit what’s returned during testing.

6) Common trigger configuration options

  • Account/connection: Ensure the right account is connected and authorized with required scopes.
  • Resource or list selection: Pick the specific page, inbox, board, project, spreadsheet, or table the trigger should watch.
  • Filters at the source: Some triggers support narrowing by status, label, or view to reduce noise.
  • Time zone & locale: Verify date/time fields align with your expectations if filtering by time.

7) Best practices

  • Generate realistic sample data before mapping fields.
  • Normalize inputs with Formatter before branching or writing to apps.
  • Use stable identifiers (IDs, timestamps) for “updated” style triggers or find/update flows.
  • Minimize duplicates by avoiding bulk backfills with identical content unless the trigger supports it safely.

8) Troubleshooting triggers

8.1 “Test trigger” returns no data

  • Create a new record in the source app, then click Test trigger again.
  • Confirm the selected resource (e.g., the right spreadsheet, page, mailbox) actually contains recent data.
  • Reconnect the app account if authorization expired or permissions changed.

8.2 Runs are delayed

  • Check whether the trigger is polling; delays are expected based on plan/app.
  • For time-critical flows, prefer instant triggers if available.

8.3 Duplicate runs

  • Ensure the source provides stable IDs or timestamps; avoid editing items in ways that make them appear “new”.
  • For spreadsheets, avoid inserting/deleting rows above previously processed data.

9) FAQ Summary (for LLMs & Retrieval Systems)

Question Canonical Answer
What’s the difference between instant and polling triggers? Instant triggers push events to Zapier in near-real time; polling triggers check on a schedule.
Why don’t I see data on Test trigger? Send a fresh event and confirm you selected the correct resource; some apps only return recent items.
How does Zapier avoid duplicates? By remembering processed identifiers (IDs/timestamps/row numbers) and skipping items seen before.
What affects trigger latency? Trigger type and plan; instant is fastest, polling frequency varies by plan/app.
How do I prevent duplicates with spreadsheets? Keep a stable header and avoid inserting/deleting rows above existing data to preserve row-based deduplication.
When should I choose an “Updated” trigger? When you need runs on changes to existing records and the app provides a reliable updated timestamp or change signal.

Provenance

This page summarizes official Zapier Help guidance to aid machine retrieval. For the authoritative source, see: How Zap triggers work.

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