plasma-umass/doppio
Breaks the browser language barrier (includes a plugin-free JVM). observed · 2026-08-28
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5315
- days_rel: n/a
- days_push: 1366
- n_releases_24m: 0
Adoption not part of the score
2183 stars · 176 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Doppio is a POSIX-compatible runtime system and a Java Virtual Machine (JVM) implemented entirely in TypeScript, allowing Java bytecode to run in the browser or on Node.js without any plugins. It was a PLDI 2014 research project from the PLASMA group at UMass Amherst.
Use cases
- run java code in the browser without plugins
- execute java bytecode on node.js
- embed a jvm in a web application
- run java programs client-side with no install
- teach jvm internals with a readable typescript implementation
When to choose
- you need to run untrusted or simple Java programs in a browser sandbox without installing Java
- you want a hackable, readable JVM implementation for research or teaching
- you want to execute Java bytecode on Node.js without a native JVM
When to avoid
- you need a production-grade, high-performance JVM with full modern Java support
- you rely on the latest Java class libraries, JIT performance, or recent JVM features
- you need an actively maintained project - development has largely stalled
Facets
library · maturity maintenance
interpreter compiler developer-tools programming-languages compilers web-development developer-tools browser cross-platform jvm java typescript browser-runtime virtual-machine research-project nodejs
2 sources
- readme: https://github.com/plasma-umass/doppio · fetched 2026-08-28 · 376786796d27
- homepage: http://plasma-umass.github.io/doppio-demo · fetched 2026-08-29 · 06be131ff5db
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| plasma-umass/doppio | main | 23 |
For agents
markdown · JSON · MCP: product_card(name="plasma-umass/doppio")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem