# getify/LABjs

Loading And Blocking JavaScript: On-demand parallel loader for JavaScript with execution order dependencies

Repository: https://github.com/getify/LABjs
Canonical: https://ross.abutalabs.com/products/labjs
Homepage: http://labjs.com
Language: HTML
License Family: other
Topics: script-loader, performance
Archived: true
Last push: 2019-07-17T23:35:04+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 6142, "days_push": 2604, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2259, forks 305 (observed 2026-08-28T04:06:31.646836+00:00)

## What it is
LABjs is a dynamic JavaScript script loader that loads all scripts in parallel while allowing explicit execution-order dependencies via a chained .wait() API. It was designed to replace blocking <script> tags with a performance-optimized loading approach for the browser.

## Use cases
- load javascript files in parallel in the browser
- control script execution order with dependencies
- speed up page load by avoiding blocking script tags
- chain inline scripts to run after loaded scripts
- optimize legacy website script loading performance

## When to choose
- maintaining an older codebase that already uses LABjs
- supporting very old browsers where native async/defer handling is unreliable
- you need fine-grained parallel loading with explicit execution-order control

## When to avoid
- starting a new modern project - use native ES modules, async/defer, or a bundler instead
- you need actively maintained software - the repo was archived in 2022
- you rely on modern module bundling or tree-shaking workflows

## Facets
- artifact type: library
- maturity: abandoned
- function: http-client, developer-tools
- domain: web-development, frontend, performance
- platform: browser
- tags: script-loader, parallel-loading, async-scripts, legacy-browser-support, archived, javascript

## Member repositories
- getify/LABjs (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:31.646836+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 2026-08-30T02:42:45.325912+00:00, confidence not recorded.
  - readme: https://github.com/getify/LABjs (fetched 2026-08-28T04:06:31.646836+00:00, sha 2f03daf25e17)
  - homepage: http://labjs.com (fetched 2026-08-29T10:23:22.831286+00:00, sha c376de787bfc)
- Data as of 2026-08-30T08:39:29.467469+00:00.