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Top 23 JavaScript WebAssembly Projects
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Project mention: OCR in the Browser: How Tesseract.js Makes PDF Text Extraction Free | dev.to | 2026-04-25
For the actual implementation in your own app, the Tesseract.js GitHub repo is well-documented and the API hasn't changed much in years.
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Puter.js
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Project mention: Running Python code in a sandbox with MicroPython and WASM | news.ycombinator.com | 2026-06-06
The architecture is a fairly straightforward WebAssembly-native monolithic kernel. Most of the complexities come from making things work well within the browser constraints for real world, large apps.
We have quite a bit of experience on the topic however, these are previous projects of ours:
WebVM (https://webvm.io): x86 Debian shell running client-side in the browser via x86 -> WebAssembly JIT compilation
Browsercraft (https://browsercraft.cheerpj.com): Minecraft running unmodified in the browser via our WebAssembly JVM (CheerpJ)
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evidence
Business intelligence as code: build fast, interactive data visualizations in SQL and markdown
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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Project mention: Watlings: Learn WebAssembly by writing small programs | news.ycombinator.com | 2026-01-09
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That's good to know, thanks!
It makes this quite realistic, which might mean a good/great OPFS VFS (like Roy's) actually starts to make sense.
https://github.com/rhashimoto/wa-sqlite/discussions/99
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wasm-git
GIT for nodejs and the browser using https://libgit2.org compiled to WebAssembly with https://emscripten.org
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camaro
camaro is a Node.js library that transform XML to JSON, using Node.js binding to native XML parser pugixml, one of the fastest XML parser around.
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wasm-audio-decoders
Browser and NodeJS Web Assembly audio decoder libraries that are highly optimized for size and performance.
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wasmedge-quickjs
A high-performance, secure, extensible, and OCI-complaint JavaScript runtime for WasmEdge.
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vosk-browser
A speech recognition library running in the browser thanks to a WebAssembly build of Vosk
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wasm-by-example
Wasm By Example is a website with a set of hands-on introduction examples and tutorials for WebAssembly (Wasm)
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quarto-webr
Community developed Quarto Extension to Embed webR for HTML Documents, RevealJS, Websites, Blogs, and Books.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
JavaScript WebAssembly discussion
JavaScript WebAssembly related posts
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Firefox-WASM: Firefox in WebAssembly
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Firefox Now Runs on WebAssembly: Open-Source GitHub Project Released, Details Pending
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What if the browser was the server?
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Show HN: Access OPFS from multiple tabs using a fake Shared Worker
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OCR in the Browser: How Tesseract.js Makes PDF Text Extraction Free
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CERN rebuilt the original browser from 1989
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Ghostty compiled to WASM with xterm.js API compatibility
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A note from our sponsor - SaaSHub
www.saashub.com | 9 Aug 2026
Index
What are some of the best open-source WebAssembly projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Tesseract.js | 38,608 |
| 2 | webvm | 17,106 |
| 3 | evidence | 6,833 |
| 4 | walt | 4,639 |
| 5 | pic-smaller | 2,717 |
| 6 | telegram-react | 2,562 |
| 7 | wordpress-playground | 1,971 |
| 8 | watlings | 1,755 |
| 9 | wa-sqlite | 1,397 |
| 10 | unity-webxr-export | 1,253 |
| 11 | cheerp-meta | 1,187 |
| 12 | sqlite-wasm | 1,036 |
| 13 | opus-recorder | 995 |
| 14 | wasm-git | 837 |
| 15 | webassemblyjs | 834 |
| 16 | python-wasm | 683 |
| 17 | camaro | 581 |
| 18 | wasm-audio-decoders | 568 |
| 19 | wasmedge-quickjs | 562 |
| 20 | vosk-browser | 527 |
| 21 | wasm-by-example | 525 |
| 22 | firefox-wasm | 496 |
| 23 | quarto-webr | 444 |
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