# marko-js/marko

A declarative, HTML-based language that makes building web apps fun

Repository: https://github.com/marko-js/marko
Canonical: https://ross.abutalabs.com/products/marko
Homepage: https://markojs.com
Language: JavaScript
License: MIT
License Family: permissive
Topics: javascript, ui-components, dom, vdom, nodejs, server-side-rendering, client-side-rendering, isomorphic, frontend
Last push: 2026-08-26T21:18:29+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 4621, "days_push": 7, "days_rel": 7, "gap_med": 0.0, "n_releases_24m": 739}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 14407, forks 663 (observed 2026-08-28T04:11:06.946674+00:00)

## What it is
Marko is a declarative, HTML-based language and framework for building dynamic, reactive web user interfaces, where nearly any valid HTML is valid Marko. It features an optimizing compiler, streaming and resumable server-side rendering, and a tiny runtime, and is used in production at eBay.

## Use cases
- build reactive web apps using HTML-like syntax
- server-side render pages with streaming and resumability
- create reusable UI components for isomorphic apps
- minimize client-side JavaScript shipped to the browser
- build a full-stack app with Marko Run and file-based routing
- progressively enhance static HTML with interactive islands

## When to choose
- you want an HTML-first declarative UI language with minimal new concepts
- you need fast first paint via streaming SSR with little or no client JS
- you are building high-traffic production sites where performance matters
- you want compile-time optimizations and automatic asset lazy loading

## When to avoid
- your team is invested in a mainstream ecosystem like React, Vue, or Svelte with large community support
- you need a vast ecosystem of third-party components and libraries
- you prefer JSX or a JavaScript-centric component authoring model
- you are building native mobile or desktop apps

## Facets
- artifact type: framework
- maturity: active
- function: frontend-framework, ui-components, ssr, templating, compiler, state-management, web-framework
- domain: web-development, frontend
- platform: browser, cross-platform
- tags: html-based-language, declarative-ui, streaming-ssr, resumable, isomorphic, vdom, marko-run, vite-plugin, nodejs, web-server

## Member repositories
- marko-js/marko (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:06.946674+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 2026-08-29T17:12:35.871905+00:00, confidence not recorded.
  - readme: https://github.com/marko-js/marko (fetched 2026-08-28T04:11:06.946674+00:00, sha 5b43c9161705)
  - homepage: https://markojs.com (fetched 2026-08-29T08:06:26.423012+00:00, sha 351169c4a57d)
  - site_page: https://markojs.com/docs (fetched 2026-08-29T08:06:26.432454+00:00, sha 44136fa355b3)
  - site_page: https://markojs.com/docs/newsletter/july-2026 (fetched 2026-08-29T08:06:26.434402+00:00, sha 2eac128a7fb0)
  - site_page: https://markojs.com/docs/newsletter/june-2026 (fetched 2026-08-29T08:06:26.436859+00:00, sha 860d0cc8f777)
  - site_page: https://markojs.com/docs/newsletter/may-2026 (fetched 2026-08-29T08:06:26.438853+00:00, sha 10ba0992a409)
  - site_page: https://markojs.com/docs/newsletter (fetched 2026-08-29T08:06:26.440510+00:00, sha afcb4d0febf2)
  - site_page: https://markojs.com/docs/introduction/getting-started (fetched 2026-08-29T08:06:26.442942+00:00, sha d9108ee2b19d)
  - site_page: https://markojs.com/docs/introduction/welcome-to-marko (fetched 2026-08-29T08:06:26.444977+00:00, sha 29f350c2bbde)
  - site_page: https://markojs.com/docs/introduction/installation (fetched 2026-08-29T08:06:26.446781+00:00, sha fd1cfd15115e)
- Data as of 2026-08-30T08:39:29.467469+00:00.