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40 lines
1.3 KiB
Markdown
40 lines
1.3 KiB
Markdown
# Data Structure
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For "basic usage" it is not necessarily needed to understand how the data that
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gets passed from one node to another is structured. However, it becomes important if you want to:
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- create your own node
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- write custom expressions
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- use the Function or Function Item node
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- you want to get the most out of n8n
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In n8n, all the data that is passed between nodes is an array of objects. It has the following structure:
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```json
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[
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{
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// Each item has to contain a "json" property. But it can be an empty object like {}.
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// Any kind of JSON data is allowed. So arrays and the data being deeply nested is fine.
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json: { // The actual data n8n operates on (required)
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// This data is only an example it could be any kind of JSON data
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jsonKeyName: 'keyValue',
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anotherJsonKey: {
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lowerLevelJsonKey: 1
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}
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},
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// Binary data of item. The most items in n8n do not contain any (optional)
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binary: {
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// The key-name "binaryKeyName" is only an example. Any kind of key-name is possible.
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binaryKeyName: {
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data: '....', // Base64 encoded binary data (required)
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mimeType: 'image/png', // Optional but should be set if possible (optional)
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fileExtension: 'png', // Optional but should be set if possible (optional)
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fileName: 'example.png', // Optional but should be set if possible (optional)
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}
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}
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},
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...
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]
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```
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