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Reference previous nodes

英文官方文档 / build/work-with-data/reference-data/reference-previous-nodes.md / 固定提交 15824496

When working with data in n8n, you'll often need to reference information from the current node or from previous nodes in your workflow.

Common ways of referencing

The most frequently used methods for accessing data are:

$json: Access JSON data from the current input item
$('<node-name>').item.json: Access JSON data from a linked item in a previous node

These methods work in both expressions and the Code node:

Method	Description
`$binary`	Access binary data from the current input item
`$input.item`	The input item currently being processed
`$('<node-name>').first()`	Get the first item from a specified node
`$('<node-name>').last()`	Get the last item from a specified node
`$('<node-name>').all()`	Get all items from a specified node

Methods for working with the input of the current node. Some methods and variables aren't available in the Code node.

Method	Description	Available in Code node?
`$binary`	Shorthand for `$input.item.binary`. Incoming binary data from a node	❌
`$input.item`	The input item of the current node that's being processed. Refer to Item linking for more information on paired items and item linking.	✅
`$input.all()`	All input items in current node.	✅
`$input.first()`	First input item in current node.	✅
`$input.last()`	Last input item in current node.	✅
`$input.params`	Object containing the query settings of the previous node. This includes data such as the operation it ran, result limits, and so on.	✅
`$json`	Shorthand for `$input.item.json`. Incoming JSON data from a node. Refer to Data structure for information on item structure.	✅ (when running once for each item)
`$input.context.noItemsLeft`	Boolean. Only available when working with the Loop Over Items node. Provides information about what's happening in the node. Use this to determine whether the node is still processing items.	✅

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Method	Description
`_input.item`	The input item of the current node that's being processed. Refer to Item linking for more information on paired items and item linking.
`_input.all()`	All input items in current node.
`_input.first()`	First input item in current node.
`_input.last()`	Last input item in current node.
`_input.params`	Object containing the query settings of the previous node. This includes data such as the operation it ran, result limits, and so on.
`_json`	Shorthand for `_input.item.json`. Incoming JSON data from a node. Refer to Data structure for information on item structure. Available when you set Mode to Run Once for Each Item.
`_input.context.noItemsLeft`	Boolean. Only available when working with the Loop Over Items node. Provides information about what's happening in the node. Use this to determine whether the node is still processing items.

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Methods for working with the output of other nodes. Some methods and variables aren't available in the Code node.

Method	Description	Available in Code node?
`$("<node-name>").all(branchIndex?, runIndex?)`	Returns all items from a given node. If `branchIndex` isn't given it will default to the output that connects `node-name` with the node where you use the expression or code.	✅
`$("<node-name>").first(branchIndex?, runIndex?)`	The first item output by the given node. If `branchIndex` isn't given it will default to the output that connects `node-name` with the node where you use the expression or code.	✅
`$("<node-name>").last(branchIndex?, runIndex?)`	The last item output by the given node. If `branchIndex` isn't given it will default to the output that connects `node-name` with the node where you use the expression or code.	✅
`$("<node-name>").item`	The linked item. This is the item in the specified node used to produce the current item. Refer to Item linking for more information on item linking.	✅
`$("<node-name>").params`	Object containing the query settings of the given node. This includes data such as the operation it ran, result limits, and so on.	✅
`$("<node-name>").context`	Boolean. Only available when working with the Loop Over Items node. Provides information about what's happening in the node. Use this to determine whether the node is still processing items.	✅
`$("<node-name>").itemMatching(currentNodeInputIndex)`	Use instead of `$("<node-name>").item` in the Code node if you need to trace back from an input item.	✅

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