microsoft/napajs

Health v2 · maintenance only

Flags: archived no_license

Adoption not part of the score

9174 stars · 329 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Napa.js is a multi-threaded JavaScript runtime built on V8 that executes JavaScript across multiple V8 isolates with APIs for object transport, sharing, and synchronization between threads. It is distributed as a Node.js module and can also be embedded in a host process without Node.js.

Use cases

• run CPU-bound JavaScript tasks in parallel
• offload heavy computation from the Node.js event loop
• execute JavaScript across multiple V8 isolates
• share and synchronize objects between JavaScript threads
• embed a JavaScript runtime in a native host process

When to choose

• your Node.js workload is bottlenecked by CPU-bound tasks
• you need multi-threaded JavaScript with object sharing and synchronization
• you want to embed a V8-based JS runtime without a Node.js dependency

When to avoid

• your workload is I/O-bound and Node.js async suffices
• you need a runtime under active development - the project has seen little recent activity
• modern Node.js worker_threads meet your parallelism needs

Facets

library · maturity maintenance

concurrency interpreter developer-tools developer-tools performance backend cpp cross-platform windows multithreading v8 cpu-bound parallel-computing javascript-runtime worker-threads nodejs linux macos

Member repositories

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