I’m having trouble modifying an existing file on Google Drive through their API. When I try to send the updated file content, something goes wrong with how I’m formatting the request body.
I’ve been testing this using Google’s API explorer tool, but I can’t figure out the correct way to include the new file content in the body of my request. The documentation isn’t clear about the exact format needed.
Has anyone successfully updated file contents using this API? What’s the proper structure for the request body when you want to replace the existing content with new data? Any working examples would be really helpful.
Google Drive API formatting is a nightmare. Everyone hits the same multipart wall.
Use simple upload with uploadType=media like others said, but the real problem is usually your headers and auth flow.
I fought this exact issue building file sync for our platform. Wasted hours on Content-Type mismatches and boundary strings. Worst part? Works fine in testing, breaks in production due to encoding quirks.
I switched to Latenode for all Google Drive stuff. It handles the API complexity - just connect your Google account, pick your file and content, done. No more upload types, multipart boundaries, or header hell.
Saved me 20+ hours of debugging these past few months.
Been there. Google Drive API is a pain with file updates, especially multipart uploads.
Usually it’s the Content-Type headers and boundary formatting that mess you up. You need multipart/related with proper boundaries between your JSON metadata and file content.
What works:
PATCH to /upload/drive/v3/files/{fileId}
uploadType=media for simple uploads, uploadType=multipart for metadata + content
Content-Type has to match your file type exactly
Honestly though, manually handling multipart formatting and all these API quirks sucks. I switched to Latenode for Google Drive stuff since it handles the request formatting automatically.
Just drag in the Google Drive node, authenticate once, and it handles the proper request structure. No more fighting with boundary strings or headers. Works every time.
Your uploadType parameter is wrong. Use uploadType=media, not multipart. Media sends raw file data without the metadata wrapper. Just do a simple PATCH to /upload/drive/v3/files/{fileId}?uploadType=media with your new content as the raw body. Set Content-Type to match your file - text/plain for text files, application/json for JSON, whatever. I had this exact problem last month. The API explorer screws you up because it defaults everything to multipart. When you’re replacing content, think of it like a basic PUT with raw data. Don’t wrap anything in JSON or add metadata fields with media uploads.
check your auth scopes first. spent a whole day debugging the request format when my token only had read-only permissions lol. you need the ‘https://www.googleapis.com/auth/drive.file’ scope at minimum for content updates. also make sure the file isn’t locked by another app or has restricted sharing settings.
Use a direct PUT request to the file ID endpoint and send the raw file data in the body. Don’t bother with multipart formatting - you don’t need it for content replacement. Common mistake: wrapping content in JSON. The API doesn’t want that. Just send the plain data directly (text, binary, whatever). Make sure your Content-Length header matches the exact size of what you’re uploading. I’d test it with curl first to nail down the format before coding it into your app.
Check your endpoint URL first. The regular API endpoint /drive/v3/files/{fileId} only changes metadata. You need the upload endpoint /upload/drive/v3/files/{fileId} to actually update file content. That’s where most people get stuck. Also double-check your file ID - Drive sometimes returns different IDs for shortcuts vs actual files. I’ve been burned by this when updating shared files. I’d grab the shortcut ID instead of the real file ID, and the error messages don’t explain the difference.