@cruftjs

The JavaScript engine, runtime, and ecosystem stack for your agents. npm i -g cruftjs

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cruft.sh
Joined July 2026
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  • Followers17
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Did you know Cruft is the only JS runtime to employ its own Brotli? We’re marked safe from this one!
unusual_whales
@unusual_whalesOct 23
BREAKING: OpenAI says it found a critical flaw in Brotli, a widely used compression library built into software like Node.js, Bun and Envoy. The bug could let an attacker take over a system just by sending it malicious compressed data, with no login needed. That works both ways: a hacker could hijack an unpatched server, or a malicious server could hijack an unpatched user’s device.
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Learn more: cruft.sh/docs/brotli

Brotli | Cruft

rusty-js-brotli is Cruft's Brotli codec, the code that decompresses br-encoded HTTP responses and DecompressionStream input. It decodes and encodes real Brotli and caps output at 256 MiB (configura...

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Cruft is the only JavaScript engine with a sound type language, checked at runtime and fully interoperable with Typescript and JS. cruft.sh/cruftscript

CruftScript | Cruft

The sound typed language for the JavaScript world. It reads like TypeScript, runs on Cruft, and a value typed User has actually been checked to be one.

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Cruft is the only JS runtime to implement its own TLS. No BoringSSL, no OpenSSL. Just TLS and crypto from first principles. cruft.sh/docs/tls-and-crypto

TLS and cryptography | Cruft

Cruft's entire cryptographic stack, the hashes, AES, RSA, the elliptic curves, the DER and X.509 decoders, and a TLS 1.3 client and server, is its own Rust with no OpenSSL, ring, or rustls undernea...

cruft.sh
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github.com/cruftless-dev/cru…
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Cruft is the cleanest JS runtime ever built in Rust. We use unsafe only in our ABI and JIT
Guillermo Rauch
@rauchgAug 25
Replying to @cruftjs
Very clean!
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Cruft is the only JS runtime that includes native support for Node, Bun, and Deno globals. cruft.sh/docs/coming-from-de…

Coming from Deno | Cruft

What happens when you run Deno code under Cruft. Cruft ships a Deno global, so most of the Deno runtime API (the file system, env, Deno.Command, Deno.serve) runs. What does not carry over is Deno's...

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Cruft ships a WASM engine called Zoom; the only JS and WASM pair outside V8, JavaScriptCore and SpiderMonkey. Learn more here! cruft.sh/docs/webassembly

Zoom | Cruft

Zoom is Cruft's WebAssembly implementation: its own binary parser, validator, and interpreter, plus the host bridge that installs the WebAssembly namespace. It runs core MVP modules and a broad set...

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Worried about supply chain attacks? Our Rust 🦀 JS engine vendors only Cranelift and libc. We own everything else. Download the source and compile a release build in ~1 minute! github.com/cruftless-dev/cru…

GitHub - cruftless-dev/cruft: The JavaScript engine, runtime, and ecosystem stack for your agents.

The JavaScript engine, runtime, and ecosystem stack for your agents. - cruftless-dev/cruft

github.com
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Cruft server cold starts run faster than Bun 1.4
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Read more here! cruft.sh/blog/cruft-server-c…

Cruft Server Cold Starts Faster Than Bun | Cruft

We built a benchmark that measures time to serve, the interval from spawning a server process to its first HTTP 200. Against Node and Bun, Cruft is fastest to first response on a cold machine, where...

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Join the Cruft Community discord! discord.gg/27fT8DDTJ

Discord - Group Chat That’s All Fun & Games

Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out.

discord.com
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Introducing the Cruft JavaScript Runtime! npm i -g cruftjs On our internal benchmarks, Cruft is the most conformant JS engine ever released, passing 99%+ of test262. Its binary is half the size of Node and runs most npm packages. Cruft is an alpha release. Do not use it in production.
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