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Workflow Nodes ​

OneHazel is an AI-powered iPaaS (integration platform as a service) that lets you connect external APIs and orchestrate them into workflows — event-driven automations that run without you writing any code.

This documentation covers three concepts:

  • Connectors — pre-built integrations for services like Stripe, HubSpot, Postmark, and ~280 others. Connectors define how to talk to a specific API.
  • Connections — your authenticated instance of a connector (API keys, OAuth tokens, etc.). You can have multiple connections per connector (e.g. one Stripe connection for test mode and another for live).
  • Nodes — the building blocks of a workflow. Each node does one specific thing: call an API, branch on a condition, transform data, delay, retry, etc.

How a workflow runs ​

  1. A trigger node starts the workflow. Triggers can be event-driven (when an event matching a filter is received), schedule-driven (cron), or webhook-driven (external system POSTs to a unique URL).
  2. The engine walks the graph, executing each downstream node in order. Branching nodes (If/Else, Switch, Try/Catch, Filter, Retry) decide which outgoing edges fire based on the node's outputs.
  3. Each node writes its result into an implicit execution context that downstream nodes can reference using {{node_id.path.to.field}} template syntax.
  4. When every leaf branch finishes, the workflow execution is marked complete. You can view every past run under the Workflows tab.

Referencing data between nodes ​

Any node that accepts a data reference field (marked with the branch icon in the config drawer) lets you pull values from earlier nodes using {{...}} syntax:

{{trigger.data.amount}}
{{stripe_call.data.customer_id}}
{{loop.index}}

The data picker inside those fields renders a tree of every value any upstream node has produced. Pick from the tree and it inserts the correct reference token — no need to type the path manually.

Where to go next ​

  • Triggers — how workflows start (Event, Schedule, Webhook).
  • Actions — how workflows do things (API Call, HTTP Request, Emit Event).
  • Flow Control — If/Else, Switch, Loop, Parallel, Merge, Delay.
  • Data — Transform, Filter, Aggregate.
  • AI — AI Transform and AI Classify nodes (LLM-powered steps inside a workflow).
  • Error Handling — Try/Catch and Retry for resilience.
  • Connectors — reference pages for every connector in the marketplace.