This approach is ideal for exporting database query results or lists of objects without saving a temporary file to disk. You use as a buffer.
FastAPI, return a File response with the output of a sql query fastapi download csv
To implement functionality, you can use built-in response classes like StreamingResponse for in-memory data or FileResponse for existing local files. Comparison of CSV Download Methods This approach is ideal for exporting database query
Choose a method based on where your data lives and its size: Requirement Dynamic data (DB queries, lists) io.StringIO or an async generator FileResponse Pre-existing static files A valid file path on the server Pandas Integration Data science workflows pandas installed 1. Download In-Memory Data (Recommended) fastapi download csv