n8n-docs/docs/code-examples/javascript-functions/get-binary-data-buffer.md

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Get the binary data buffer

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:

• Manipulating the data: for example, adding column headers to a CSV file.
• Using the data in calculations: for example, calculating a hash value based on it.
• Complex HTTP requests: for example, combining file upload with sending other data formats.

You can access the buffer using n8n's getBinaryDataBuffer() function:

let binaryDataBufferItem = await this.helpers.getBinaryDataBuffer(itemIndex, binaryPropertyName);

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.