Files API
The Files API enables uploading source documents and listing resource IDs that can be resolved through the authenticated document-session endpoint.List Files
Retrieve all files in a specific container (folder) for your organization.Path Parameters
Request Example
Response
Response Fields
Status Codes
- 200 OK: Successfully retrieved file list
- 400 Bad Request: Authentication failed
- 401 Unauthorized: Missing or invalid Bearer token
- 500 Internal Server Error: S3 operation failed
Upload File
Upload a file to S3. Automatically converts DOCX to PDF (except in templates container). Validates file type by extension and MIME type.Request
Content-Type:multipart/form-data
Supported File Types
.docx- Word documents.pdf- PDF documents.csv- CSV files.xlsx- Excel spreadsheets.rtf- Rich Text Format
Request Example
Python Example
Response
Status Codes
- 200 OK: File uploaded successfully
- 400 Bad Request: File validation failure (invalid type, size, etc.)
- 401 Unauthorized: Missing or invalid Bearer token
- 500 Internal Server Error: S3 upload failed
Error Examples
Invalid File Type:Auto-Conversion: DOCX to PDF
Files uploaded as.docx are automatically converted to PDF (except in the templates container):
- Input:
document.docx - Output:
document.pdf - Exception: Files uploaded to
templatescontainer are not converted
Container Types
Common container names and their purposes:Downloading Files
For source-file viewers, usePOST /source-file with the source file’s resource_id and the user’s organization Bearer token. This endpoint authorizes the user on every request and does not accept a document session token:
POST /document-file-session and POST /generate-onlyoffice-config flow. For ordinary session-based document viewers, use the session endpoint to obtain a short-lived session token:
?session_token=.... Query strings are commonly captured by access logs, browser history, proxies, and monitoring systems. The query-string form is reserved for the OnlyOffice server-to-server request and is accepted only when accompanied by a separately signed OnlyOffice JWT; a copied URL alone cannot download the file.