Fix SharePoint Online JSOM Large File Upload Errors
Question details
The user is unable to upload large files (around 50 MB) to SharePoint Online using JSOM, resulting in GUID errors, content stream errors, and corrupted files.
- Product
- SharePoint Online
- Device & OS
- not provided
- Scenario
- Uploading large files to a SharePoint document library using the JavaScript Object Model (JSOM) via chunked requests.
- Observed behavior
- Small files upload successfully, but files around 50 MB fail during the chunked upload process. Users experience GUID formatting errors, unsupported value errors for parameters.ContentStream, and files that are created but heavily corrupted or only a few bytes in size.
Ensure you have the latest version of the SharePoint JSOM library referenced in your project and verify your SharePoint site's maximum file upload size limit and permissions.
Consult Microsoft Q&A for Advanced JSOM Debugging
Because chunked uploads via JSOM involve complex stream and GUID handling, seeking expert developer assistance is the most effective approach for custom scripts.
Implementing a chunked upload using startUpload, continueUpload, and finishUpload in JSOM requires strict adherence to byte array limitations and session identifiers. Minor implementation issues often result in corrupted files.
Compile your complete JSOM upload script, specifically focusing on the sections handling Base64EncodedByteArray and the file slicing logic.
Take note of the exact error messages, such as unsupported values for parameters.ContentStream or GUID formatting failures.
Visit the official Microsoft Q&A developer forum (https://learn.microsoft.com/en-us/answers/questions/).
Submit a new question detailing your implementation, error logs, and tag it with 'SharePoint' and 'JavaScript' to get dedicated assistance from API experts.
Review JSOM Chunked Upload Best Practices
Verify that your local JavaScript code properly handles file slices and Base64 encoding to prevent upload failures and data corruption.
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Frequently Asked Questions
Why do small files upload successfully but large files fail in JSOM?
Small files can be uploaded in a single API request. Large files exceed the single request limit and must be divided into smaller slices using startUpload, continueUpload, and finishUpload, which introduces complexities with GUID tracking and stream handling.
What causes the GUID format error during a JSOM upload?
This error typically occurs when the GUID generated for the upload session is improperly formatted, or if subsequent continueUpload requests fail to reference the exact same GUID initiated by the startUpload method.
Why is my uploaded SharePoint file corrupted and only a few bytes in size?
If the parameters.ContentStream fails to process the Base64EncodedByteArray correctly, SharePoint may create the file placeholder or metadata without successfully writing the binary data chunks, leaving you with an empty or broken file.
