There's a code example for calling this endpoint using curl in the documentation, and you can also generate some code for calling it using the API v2 Explorer.
If something isn't working as expected, please share the code you're using and the unexpected error or output.
The error is indicating that you're trying to parse some data as JSON, but the data isn't in a valid JSON format, so the parsing is failing.
I don't see anything that mentions Dropbox in the error screenshot, nor do I see anywhere that the stack trace in the error that references the code you posted, so I can't offer much insight. You'll need to debug your app more to track down where/why this is occuring.
@Chhavi Downloading file content via the Dropbox API works the same way, regardless of file type. You can use the /2/files/download endpoint to download file data whether the file is a .xlsx or any other type. Exactly what you then do with the data is up to you. For example, you may wish to open the data in a document viewer.
If something isn't working as expected, feel free to open a thread with details.
@Chhavi That is the file data for the requested file returned by the Dropbox API. The /2/files/download endpoint is a "content-download" style endpoint, meaning it returns the requested content in the HTTPS response body. You can use or save the response body however you wish. Exactly how you do so will depend on what HTTPS client/library you're using.
We can't provide support for third party clients/libraries, but it looks like you're using Postman in your screenshot, which I believe has a "Save Response" button (not visible in your screenshot though).
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