Windmill Labs
Windmill

Triggers

Every way to start a script or flow

Schedules, webhooks, Kafka, Postgres CDC, WebSockets, emails, and more. No extra configuration needed.

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Triggers for scripts and flows

Every trigger type works with both scripts and flows. Attach one or many triggers to any runnable. A single script can be scheduled on a cron, exposed via webhook, and listening on a Kafka topic at the same time.

Scripts

Single functions in TypeScript, Python, Go, SQL, Bash, and other languages. Attach any trigger to run them on events, schedules, or API calls.

Flows

Multi-step workflows that chain scripts into DAGs with branching, loops, retries, and approval steps. Triggered the same way as scripts.

Schedules

Run any script or flow on a cron schedule. Use the visual cron builder to set intervals from every minute to custom expressions. Schedules can be toggled on or off, have error handlers, and support recovery flows for missed runs.

Read the docs

Webhooks and HTTP routes

Every script and flow automatically gets a webhook endpoint (sync and async). For more control, HTTP routes let you define custom REST endpoints with path parameters, method routing, and preprocessors to transform incoming requests before execution.

Read the docs

Message queues and streaming

Consume events from message brokers and streaming platforms. Each message triggers a script or flow execution with the message payload as input.

Kafka
Consume from Kafka topics with configurable consumer groups and offset management.
NATS
Subscribe to NATS subjects for lightweight, high-performance messaging.
SQS
Process messages from AWS SQS queues with automatic acknowledgement.
MQTT
Subscribe to MQTT topics for IoT and event-driven workloads.
GCP Pub/Sub
Consume events from Google Cloud Pub/Sub subscriptions.

Database triggers

Postgres triggers let you run a script or flow whenever a row is inserted, updated, or deleted. Windmill uses logical replication (CDC) to capture changes in real time without polling. Configure which tables and operations to watch from the UI.

Read the docs

More trigger types

Beyond the core trigger types, Windmill supports several additional ways to start executions.

Emails
Trigger scripts when an email arrives at a Windmill-managed address. The email body and attachments are passed as input.
WebSockets
Listen for real-time bidirectional events over WebSocket connections.
Native triggers
Built-in integrations for Nextcloud, Google Drive, and Google Calendar that watch for changes without polling.
MCP
Expose scripts as tools for LLM clients via the Model Context Protocol.
CLI and API
Trigger any script or flow programmatically from the Windmill CLI, REST API, or CI/CD pipelines.

All trigger types at a glance

Schedules
Cron and visual cron builder
Webhooks
Sync and async HTTP triggers
Emails
Trigger on incoming emails
HTTP routes
Custom REST endpoints
WebSockets
Real-time bidirectional events
Postgres
CDC and row-level triggers
Kafka
Consume from Kafka topics
NATS
Subscribe to NATS subjects
SQS
AWS SQS queue consumer
MQTT
IoT and MQTT broker events
GCP Pub/Sub
Google Cloud Pub/Sub events
Native triggers
Nextcloud, Google Drive, Calendar
Auto-generated UIs
One-click run from the UI
CLI & API
Trigger from scripts or CI/CD
MCP
Trigger from LLM clients
Scheduled polls
Poll APIs on an interval

Frequently asked questions

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