# Flow.js

A JavaScript library providing multiple simultaneous, stable, fault-tolerant and resumable/restartable file uploads via the HTML5 File API.

Repository: https://github.com/flowjs/flow.js
Canonical: https://ross.abutalabs.com/products/flowjs
Language: JavaScript
License: NOASSERTION
License Family: other
Last push: 2025-01-09T16:06:32+00:00
Link (homepage): http://flowjs.github.io/ng-flow/

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4743, "days_push": 601, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2983, forks 345 (observed 2026-08-28T04:07:33.952308+00:00)

## What it is
Flow.js is a dependency-free JavaScript library that provides stable, fault-tolerant, and resumable file uploads via the HTML5 File API. It splits large files into chunks, retrying failed chunks so uploads can pause, resume, and recover after network interruptions.

## Use cases
- upload large files reliably in the browser
- resumable file uploads that survive network drops
- chunked uploads with pause and resume
- drag-and-drop multi-file upload with progress
- folder uploads with a file queue
- angularjs file upload integration

## When to choose
- you need fault-tolerant uploads of large files over HTTP
- users should be able to pause, resume, or recover interrupted uploads
- you want a dependency-free client-side uploader with drag-and-drop and folder support
- you maintain an AngularJS app and want drop-in upload support via ng-flow

## When to avoid
- you need to support legacy browsers without the HTML5 File API (pre-IE10)
- your project uses modern frameworks where newer upload libraries (e.g. Uppy, tus) are better maintained
- you need server-side upload handling only - this is a client-side library

## Facets
- artifact type: library
- maturity: maintenance
- function: file-upload, http-client
- domain: web-development, frontend, files
- platform: browser
- tags: resumable-uploads, chunked-upload, html5-file-api, large-files, angularjs, nodejs

## Member repositories
- flowjs/flow.js (main) score 23
- flowjs/ng-flow (plugin) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:33.952308+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:31:27.343222+00:00, confidence not recorded.
  - readme: https://github.com/flowjs/flow.js (fetched 2026-08-28T04:07:33.952308+00:00, sha bc6bda6005c6)
  - homepage: http://flowjs.github.io/ng-flow/ (fetched 2026-08-29T09:46:53.422410+00:00, sha 295ea7443ec7)
  - registry_npm: https://registry.npmjs.org/ng-flow (fetched 2026-08-29T09:46:53.424972+00:00, sha 5384c41e397e)
- Data as of 2026-08-30T08:39:29.467469+00:00.