23/resumable.js
Resumable.js
resumable.js is a JavaScript library for managing large file uploads using the HTML5 File API. It functions as a chunked data transmitter and resumable upload manager, dividing files into smaller segments to ensure reliable delivery to a remote server.
The library is distinguished by its ability to recover upload progress after network interruptions or browser restarts. It achieves this through resumable data transfer and server-side chunk verification, which checks for existing segments on the server to avoid redundant data transmission.
The system manages concurrent file uploads and request queueing to optimize bandwidth. It includes capabilities for upload state control—allowing users to pause, resume, or cancel transfers—and event-driven progress tracking for individual files and batches. Additionally, it provides primitives for binding file capture to HTML elements via browse buttons and drag-and-drop interfaces.
Features
- Large File Uploads - Handles the transmission of very large files by splitting them into chunks to avoid timeout and memory issues.
- Stateful Multipart Uploads - Provides a stateful upload system that allows pausing and resuming large file transfers via chunk tracking.
- File Upload - A JavaScript library for handling large file uploads using the HTML5 File API with support for chunking and resuming.
- Client-Side File Segmentation - Implements chunk-based file segmentation using the HTML5 File API to enable partial transmission and recovery.
- Chunk Existence Verification - Checks if specific file segments already exist on the server before uploading them to avoid redundant data transfer.
- Chunked File Transmitters - Functions as a chunked data transmitter that divides large files into smaller pieces for reliable delivery.
- Resumable File Transfers - Recovers upload processes after connection loss or page refresh by resuming from the last successful segment.
- Chunked Resumable Transfers - Splits files into fixed-size chunks and resumes transmission after network interruptions to ensure delivery.
- Server-Side Chunk Verification - Queries the remote server for existing segments to determine the starting offset for interrupted uploads.
- Resumable Upload Clients - Splits files into segments to recover upload progress after network interruptions or browser restarts.
- Queue Management - Provides comprehensive tools to manage the upload queue, including the ability to add, remove, or cancel files.
- Concurrent Upload Pipelines - Sends multiple files or data chunks simultaneously to maximize bandwidth and reduce overall upload time.
- Resilience and Fault Tolerance - Ensures file transfers complete successfully by automatically retrying failed chunks and recovering from interruptions.
- Chunked Transfer Controls - Allows customization of chunk sizes and simultaneous upload limits to control data transmission behavior.
- Upload Progress Tracking - Tracks completion percentages for individual files or total batches using event listeners.
- Request Retry Mechanisms - Automatically re-attempts the transmission of failed chunks to ensure completion despite transient network errors.
- Drag-and-Drop File Upload - Binds browser file inputs and drag-and-drop interfaces to the upload management system.
- Event-Driven Progress Tracking - Uses callback listeners to broadcast real-time upload state and completion percentages for files and batches.
- Concurrent Request Pooling - Manages a limited pool of simultaneous HTTP requests to optimize bandwidth and prevent server congestion.
