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32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
---
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contentType: howto
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---
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# Get the binary data buffer
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The binary data buffer contains all the binary file data processed by a workflow. You need to access it if you want to perform operations on the binary data, such as:
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* Manipulating the data: for example, adding column headers to a CSV file.
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* Using the data in calculations: for example, calculating a hash value based on it.
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* Complex HTTP requests: for example, combining file upload with sending other data formats.
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You can access the buffer using n8n's `getBinaryDataBuffer()` function:
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```js
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/*
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* itemIndex: number. The index of the item in the input data.
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* binaryPropertyName: string. The name of the binary property.
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* The default in the Read Binary Files node is 'data'.
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*/
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let binaryDataBufferItem = await this.helpers.getBinaryDataBuffer(itemIndex, binaryPropertyName);
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```
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For example:
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```js
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let binaryDataBufferItem = await this.helpers.getBinaryDataBuffer(0, 'data');
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// Returns the data in the binary buffer for the first input item
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```
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You should always use the `getBinaryDataBuffer()` function, and avoid using older methods of directly accessing the buffer, such as targeting it with expressions like `items[0].binary.data.data`.
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