test262

JavaScript engines zoo

Backend/data generator for test262.fyi

A JS/TS Engine

JSI is a JavaScript interpreter written in Rust that supports bytecode similar to quickjs. JSI 是一个 JavaScript 解释执行引擎，使用 Rust 编写无任何依赖，同时支持字节码执行。

A JavaScript engine in pure Zig.

✅ Tools for running the test262 ECMAScript test suite with SerenityOS's JavaScript engine (LibJS)

A fast, embeddable JavaScript engine for Go: QuickJS-NG reimplemented in pure Go, no cgo.

A sandbox-first JavaScript engine for AI agents: host-set capabilities and limits, deterministic runs, TypeScript annotations, test262 on every pull request.

A Rocq Mechanization of ECMAScript 2023 Regexes

A Rust-native ECMAScript engine with an embeddable bytecode runtime.

Tests for RegExp Unicode property escapes

ZIPP: Zippy Interpreter for Polyglot Programming. A portable polyglot runtime: one fast Rust VM for JavaScript and Python, with a torch subset that runs on WebGPU. Native or WebAssembly, sandboxed by default.

Embeddable JavaScript engine written in Zig, aligned with Bellard QuickJS

A high-performance JavaScript (ECMAScript) engine in pure Rust — usable as a Rust library, a C library, and a CLI. Tree-walking interpreter + register bytecode VM, with x86-64 JIT and WebAssembly engine tiers.

A PHP implementation of JavaScript's Array and Map APIs with TypeScript-style generics and Test262-inspired coverage.

A runner for Test262, the ECMAScript test suite, in Deno.

An ahead-of-time JavaScript/TypeScript to WebAssembly compiler in Rust, with conformance tracked by test262. swc frontend, wasm-encoder codegen, wasmtime runtime — no JIT, no interpreter.

Nightly conformance & performance dashboard for the lumen JavaScript engine — test262, WinterTC, Node/Bun API surface, and V8 benchmarks, every night, forever

A Lisp-native JavaScript engine — clean-room, no FFI. source → bytecode → stack VM; 88% test262.

📡 Track in-app events and user feedback in real-time with easy notifications for Phoenix. Get insights without the refresh.