> ## Documentation Index > Fetch the complete documentation index at: https://docs.ingestly.ai/llms.txt > Use this file to discover all available pages before exploring further. # If > Split a workflow into a true path and a false path with a single condition. The **If** node evaluates one condition over upstream data and sends the run down one of two ports: **True** or **False**. It is the simplest way to branch a workflow. If never changes the data. It passes the incoming output straight through, so downstream nodes keep referencing the node *above* the If, not the If itself. ## When to use If * You need a **yes/no split**: high-value invoices go to a review queue, everything else continues. * You want to **skip an optional step** for some documents, by leaving one of the two ports unconnected. * Use [switch](/nodes/switch) instead when you have three or more mutually exclusive cases. A chain of If nodes for the same field is harder to read than one Switch. * Use [classify](/nodes/classify) instead when the decision needs to read the document's content. If compares values you already have. * Use [filter](/nodes/filter) instead when you want to narrow the pages of one document rather than pick a path. ## Configuration | Field | Type | Required | Description | | ------------- | ---------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Condition** | condition editor | Yes | A group of rules over upstream data. Supports AND/OR groups, nesting, and NOT. See [authoring a condition](/guides/conditional-routing#authoring-a-condition) | The condition can reference the node directly upstream and any of its ancestors. Type `{{` in a **Field** or **Value** box to autocomplete. An If node with no condition fails the step when the run reaches it. Open the node and add at least one rule. ## Inputs and outputs **Allowed inputs:** every trigger and every action node, including another If or Switch. The condition resolves against the incoming node's output and that node's ancestors, so anything upstream is available to compare. **Output ports:** | Port | Fires when | | --------- | -------------------------------- | | **True** | The condition evaluated to true | | **False** | The condition evaluated to false | Exactly one of the two fires. Leaving a port unconnected is fine: a run that leaves through an unconnected port simply stops there, and the run still completes. The data on both ports is the upstream output, unchanged. ## Credits The If node costs 0 credits. It only compares values that already exist in the run. ## Related Branch into three or more named cases How ports, conditions, and operators fit together Validate data and branch on valid or invalid Compute a flag upstream, then branch on it