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Fast, Complete NumPy for TypeScript & JavaScript

351 starsTypeScript

NumPy for Browser, Node.js, Deno and Bun

by dupontcyborg·Feb 25, 2026·2 points·0 comments
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AI Analysis

●●●BangerWizardryZero to OneShip It

NumPy's full API in JavaScript with zero dependencies, 93% coverage validated against Python.

Strengths
  • •94% API coverage (476/507 functions) with 6,000+ cross-validated tests against NumPy—eliminates guesswork about correctness.
  • •Zero dependencies, 93 KB minified+gzipped, fully tree-shakeable—genuinely portable across Node/browser/Deno/Bun without bloat.
  • •.npy/.npz read/write compatibility—actual interop with Python ML workflows, not just syntax mimicry.
Weaknesses
  • •15x slower than NumPy in TypeScript (acknowledged; WASM optimization planned but not shipped).
  • •JavaScript numerics hit a ceiling—pure TS will never match Python's C-backed performance for serious ML workloads.
Target Audience

JavaScript/TypeScript developers needing numerical computing in browsers, Node.js, Deno, or Bun environments

Similar To

NumJS · TensorFlow.js · Danfo.js

Post Description

I've been spending some time on a side project, `numpy-ts`, which is a TypeScript numerical library inspired by NumPy. It aims to bring the same NumPy API (where possible) to Node.js/Browser/Deno/Bun with full .npy/.npz compatibility (read & write).

It currently has 476 of NumPy's 507 functions implemented, all cross-validated against NumPy with >6,000 validation tests. The lib is about 93 kB minified+gzipped and has zero dependencies, and it's fully tree-shakeable.

Since it's written in TypeScript, it's on average 15x slower than NumPy. I just tagged 1.0.0, and will begin performance optimization soon (both algorithmic and selective WASM for fused kernels).

You can try it in your browser here: https://numpyts.dev/playground

Disclaimer that this was a mix of hand-written code (API, deterministic tooling) and AI-assisted (functional implementations, validation test implementations).

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