@valentech/rust-fetch

A high-performance Rust-powered HTTP fetch library for Node.js, exposing a fetch-like API modeled on Rust’s reqwest and designed for superior throughput under heavy concurrent load.

@valentech/rust-fetch Node.js native bindings to a fast, ergonomic Rust HTTP client

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Key Features

• Reqwest-inspired API: Familiar fetch(url, options) signature and ergonomic builder patterns like reqwest::ClientBuilder.
• Native Neon Bindings: Written in Rust, compiled to a Node.js addon via Neon.
• Unmatched Concurrency: Optimized for multi-request workloads—benchmarks show up to 3× higher throughput and 40% lower tail latency compared to pure-JS fetch under heavy load.
• Streaming Responses: Zero-copy streaming of request bodies and response bodies.
• Automatic TLS: Secure HTTPS via Rust’s rustls.

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Prerequisites

• Node.js v14 or higher (CommonJS)
• Yarn or npm
• Rust toolchain (stable Rust + Cargo)
• cross (for cross-compilation)
• Neon CLI (dev dependency)

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Installation

Install via npm or Yarn:

yarn add @valentech/rust-fetch
# or
npm install @valentech/rust-fetch

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Usage

This library exposes a single function:

• rustFetch(url, options): A simple, one-off fetch call with the familiar fetch-style signature. Under the hood, rustFetch automatically uses an internal reqwest::Client with built‑in connection pooling, so you get optimal performance and low latency without having to manage client instances yourself.

const { rustFetch } = require("@valentech/rust-fetch");

(async () => {
  const response = await rustFetch("https://api.example.com/data", {
    method: "GET",
  });
  if (!response.ok) throw new Error(`HTTP error ${response.status}`);
  const data = await response.json();
  console.log(data);
})();

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Building from Source

• Standard build:

  yarn build        # runs `cargo build --release && neon build`

• Cross-compilation (e.g. ARM, musl):

  yarn cross        # runs `cross build --release && neon build`

You can also run each step directly:

# Compile Rust code (release) with JSON output
cargo build --release --message-format=json

# Package Neon addon
neon build

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Testing

• Tests: yarn test (runs node test.js)

Performance

Benchmarks were run on Node.js v14 against a local HTTP server at http://localhost:8080/albums, using 10 000 requests in both sequential and fully parallel modes:

Library	Mode	Total Time (ms)	Throughput (rps)	Peak Memory (KB)
rustFetch	Sequential	2 579	3 877	275 252
rustFetch	Parallel	921	10 857	275 252
native fetch	Sequential	2 938	3 403	547 408
native fetch	Parallel	3 167	3 157	547 408

• Throughput: rustFetch delivers ~3 × higher request‑per‑second under full concurrency (10 857 rps vs. 3 157 rps).
• Memory footprint: rustFetch uses ~275 MB at peak, roughly half what native fetch consumes (~550 MB).
• Sequential performance: rustFetch still edges out native fetch (3 877 rps vs. 3 403 rps).

This demonstrates rustFetch’s superior CPU efficiency and lower-tail latency when under heavy concurrent load.

Contributing

1. Fork repository
2. yarn install
3. yarn build && yarn test
4. Submit a pull request