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bytecodealliance
javy
Rust2022–2026
bytecodealliance / javy

javy

JS to WebAssembly toolchain

10Distinct people
11Mentions
1Explicit recommenders
2.8KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

JS to WebAssembly toolchain

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

I recommend trying Javy[0]. Javy allows you to build a WASM file that includes Javy's JS interpreter along with your JS source code. Note that Javy is a heavily sandboxed…

arjunbajaj used a recommendation phrase. One indexed comment matches. This is a phrase match, not a verdict.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 11:23:53 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year11 dated mentions

Observed mentions: 2022-09-20 18:07:28 UTC to 2026-01-09 22:39:03 UTC.

0123452022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments20222023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 5 mentions; 0 submissions, 5 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments20242025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC202
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC505
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC000
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC303
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC101

What Hacker News says

3 sources
arjunbajaj·May 31, 2025Recommendation phrase
I recommend trying Javy[0]. Javy allows you to build a WASM file that includes Javy's JS interpreter along with your JS source code. Note that Javy is a heavily sandboxed environment so it doesn't have access to the internet, or npm modules, a desirable feature for running user code. We're building an IoT Cloud Platform, Fostrom[1] where we're using Javy to power our Actions infrastructure. But instead of compiling each Action's JS code to a Javy WASM module, I figured out a simpler way by creating a single WASM module with our wrapper code (which contains some further isolation and helpful functions), and we provide the user code as an input while executing the single pre-compiled WASM module. [0] https://github.com/bytecodealliance/javy [1] https://fostrom.io
In Microsandbox: Virtual Machines that feel and perform like containers
As someone who uses bun,deno & cloudflare workers, I want to say that atleast in bun, the wasm part actually happens itself in js and bun just runs that js using javascriptcore which is definitely not optimized as it is stated by Bun docs themselves (https://bun.sh/docs/runtime/loaders#wasi) Also I am still not sure how you are thinking that this project is similar to Bun. Bun is for javascript, somebody runs wasm in js and that on bun... Faasta runs wasm directly and you would need to use javy to actually run js in Faasta https://github.com/bytecodealliance/javy Its sort of like a->b or b->a and faasta is way more leaner and better... Though bun is good if you are all Typescript. Still I am sure I am not able to explain myself clearly, so do ask me something if you think I haven't explained quite properly and I am obviously sorry about t
Read the rest
hat! (Side note: but my main gripe with deno is that I have to specify all of these permissions and its still not a 1:1 equivalent to nodejs , like its very close still though so I still used bun and I actually used just today bun to install pnpm and then install wrangler and then remove pnpm and install via bun because for some reason wrangler doesn't recognize bun as package manager but whatever right)
In Show HN: Faasta – A self-hosted Serverless platform for WASM-wasi-HTTP in Rust

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