# stackblitz/webcontainer-core

Dev environments. In your web app.

Repository: https://github.com/stackblitz/webcontainer-core
Canonical: https://ross.abutalabs.com/products/webcontainer-core
Homepage: https://webcontainers.io
License: MIT
License Family: permissive
Topics: browser, nodejs, stackblitz, webcontainer
Last push: 2025-04-22T12:05:41+00:00

## Health v2 (maintenance only)
Score: 40/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 17, release rhythm 35, longevity 100
- inputs: {"age_days": 1939, "days_push": 498, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4632, forks 273 (observed 2026-08-28T04:08:55.373041+00:00)

## What it is
WebContainers is a browser-based Node.js runtime from StackBlitz that lets web apps run full-stack JavaScript dev environments entirely in the browser. This repository is the central hub for issues and bug tracking, with the API distributed as the @webcontainer/api npm package.

## Use cases
- run node.js apps in the browser
- embed interactive coding tutorials in a web app
- build an online IDE for full-stack javascript
- let users run npm packages without installing anything
- create in-browser playgrounds for node.js SDKs
- preview full-stack apps from a PR in the browser

## When to choose
- you need instant, zero-setup Node.js dev environments embedded in a web app
- you're building interactive coding education, docs, or playgrounds
- you want disposable, secure server-side JavaScript execution client-side

## When to avoid
- you need languages or runtimes beyond Node.js/JavaScript
- your app cannot set COOP/COEP headers for cross-origin isolation
- you need heavy native modules or long-running production server workloads

## Facets
- artifact type: library
- maturity: active
- function: interpreter, developer-tools, cli, file-system, web-framework
- domain: developer-tools, web-development, frontend, education, browser-extensions
- platform: browser, wasm
- tags: webcontainers, in-browser-nodejs, stackblitz, dev-environments, interactive-coding, wasm-runtime, online-ide, nodejs, web-server

## Member repositories
- stackblitz/webcontainer-core (main) score 40

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:55.373041+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 2026-08-29T18:19:35.958795+00:00, confidence not recorded.
  - readme: https://github.com/stackblitz/webcontainer-core (fetched 2026-08-28T04:08:55.373041+00:00, sha 5d98ddd1c433)
  - homepage: https://webcontainers.io (fetched 2026-08-29T09:04:44.454848+00:00, sha e018cd807456)
  - site_page: https://webcontainers.io/guides/quickstart (fetched 2026-08-29T09:04:44.459777+00:00, sha 740c6d46d03f)
  - site_page: https://webcontainers.io/tutorial/1-build-your-first-webcontainer-app (fetched 2026-08-29T09:04:44.457792+00:00, sha 301820018d21)
- Data as of 2026-08-30T08:39:29.467469+00:00.