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For the complete documentation index, see llms.txt. This page is also available as Markdown.

Flow Settings

Manage how your flow runs and looks with the Settings sidebar, where you can configure execution, validation, security, and visuals.

When working inside any Flow in Fastn, you can adjust its behavior and appearance through the Settings option available in the right-hand sidebar.

Flow editor with the Settings option highlighted in the right-hand sidebar

The Settings panel has two main subsections: Configuration and Visuals.

Settings panel showing Configuration and Visuals subsections

1. Configuration

The Configuration section controls how your flow runs and how it handles security, validation, and errors.

Flow Type

You must choose how the flow should execute:

🔹 API (Real-Time Sync API)

  • Executes instantly and returns a real-time response.

  • Used for synchronous tasks where the result is needed immediately.

🔹 Workflow (Async Workflow Job)

Workflow flow type settings with memory limit, CPU limit, priority, and timeout options

  • Executes in the background without blocking the request.

  • Suitable for asynchronous or heavy jobs.

  • When you select Workflow, additional options appear:

    • Memory Limit – Maximum memory allocation (e.g., 2 GB).

    • CPU Limit – Maximum processing power allocated (e.g., 1 vCPU).

    • Priority – Determines how quickly the workflow is executed (Low/Medium/High).

    • Timeout (min) – Maximum duration before the workflow stops.

When Workflow is selected, a new Trigger section appears in the left sidebar, where you can define how the workflow is initiated:

Trigger section in left sidebar with Manual, Event, and Schedule workflow initiation options

  • Manual – Run the workflow manually.

  • Event – Triggered by an event.

  • Schedule – Triggered at scheduled intervals.

Validation & Multi-Tenancy

Validation and Multi-Tenancy settings with Enable Validation and Enforce Multi-Tenancy toggles

  • Enable Validation – Enforce schema validation for flow input.

  • Enforce Multi-Tenancy – Require the x-fastn-space-tenantid header to ensure the flow only accesses resources for the specified tenant.

Authentication

Authentication settings with Enable Custom Authentication toggle for Authorization header support

  • Enable Custom Authentication – Allow access with an Authorization header instead of x-fastn-api-key.

  • Uses the fastnCustomAuth flow for validation.

  • You can customize this authentication flow as needed. Learn More

Error Notification

Error Notification settings with toggle to forward errors to a notification flow like Slack

  • Enable Error Notification – Forward errors to a notification flow (e.g., sending alerts to Slack).

  • You can customize this with the fastnErrorNotification flow. Learn More

2. Visuals

The Visuals section customizes the flow editor interface.

Visuals settings with toggles for Side Action Panel, Flow MiniMap, and Dark Mode

  • Enable Side Action Panel – Displays a quick-access panel for drag-and-drop actions.

  • Enable Flow MiniMap – Adds a minimap to navigate large or complex flows.

  • Activate Dark Mode – Switches the editor to dark theme.

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