How can I convert JSON image data from Telegram Get Node to binary for OpenAI Transcriber?

Below is some guidance to resolve this issue:

What’s Likely Happening

The error
  "Cannot read properties of undefined (reading ‘split’)"
indicates that the Convert to File node is trying to process a field that isn’t available. In your workflow, you’re taking JSON from the Telegram Get node and feeding it into the Convert to File node. However, the Convert to File node expects a defined value (for example, a string from a specified field) in order to run its conversion (e.g., converting JSON text to binary).

How to Solve It

1. Confirm Which Field Contains Your Data
   Check the output of the Telegram Get node. Often, if you’re receiving a file from Telegram, it may come back in a binary property (for example, attached as part of the JSON with a key like “binary” or “data”). If the node doesn’t automatically download the file (or it isn’t set to do so), then the property you expect may be missing.

2. Set the Correct Field in the Convert to File Node
   When using the Convert to File node to turn JSON into a binary file:

   • Choose the correct operation (for example, “Convert to JSON” if you want to take JSON data and output it as a file).

   • In the node parameters, ensure that the Text Input Field (or similar parameter based on the conversion operation) is set to the property that actually contains your file content.

     For example, if your Telegram node is returning its file in a property named data under binary, you might reference it with an expression like:

     JSCopied
     {{$binary.data}}

     Note: The exact key name depends on how the Telegram node outputs the file. Make sure that the field name is not misspelled and that the field really exists in the Telegram node’s output.

3. Ensure That the Input Data Is Valid
   If you intended to transform a received image (which is already binary) to a file that the OpenAI Transcriber can analyze, first verify whether conversion is necessary. If the Telegram Get node is configured to download the file (with Download turned on), you may already have binary data available that you can pass directly to your transcription node.

Recap

• The error comes from a misconfiguration or wrong field reference in the Convert to File node.
• Check and verify what field the Telegram Get node outputs and ensure that field is passed along.
• Use the proper node parameter (such as Text Input Field or Base64 Input Field) in the Convert to File node to correctly reference your data.
• If the file from Telegram is already in a binary format, you might not need further conversion and could pass it directly to the OpenAI Transcriber node.

By ensuring the Convert to File node is referencing the correct, defined data field, you should be able to avoid the “split” error and have your file in the proper binary format for subsequent processing.