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44 lines
1.3 KiB
Markdown
44 lines
1.3 KiB
Markdown
# Data mapping
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Data mapping means referencing data from previous nodes. It doesn't include changing (transforming) data, just referencing it.
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You can map data in the following ways:
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* Using the expressions editor. Refer to [expressions](/code-examples/expressions/) for more information.
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* By dragging and dropping data from the **INPUT** table into parameters. This generates the expression for you.
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## How to drag and drop data
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1. Run your workflow to load data.
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2. Open the node where you need to map data.
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3. Make sure the **INPUT** view is in **Table** layout.
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4. Click and hold a table heading to map top level data, or a field in the table to map nested data.
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5. Drag the item into the parameter field where you want to use the data.
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### Understand nested data
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Given the following data:
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```js
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[
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{
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"name": "First item",
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"nested": {
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"example-number-field": 1,
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"example-string-field": "apples"
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}
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},
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{
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"name": "Second item",
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"nested": {
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"example-number-field": 2,
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"example-string-field": "oranges"
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}
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}
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]
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```
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n8n displays it in table form like this:
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