nodejs/undici

Health v2 · maintenance only

Adoption not part of the score

7682 stars · 846 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Undici is a fast HTTP/1.1 client library for Node.js, written from scratch, that also provides WHATWG-compliant fetch, WebSocket, EventSource, and related web standard implementations. It offers low-level dispatchers (Client, Pool, Agent), proxy support, interceptors, and mocking utilities for testing.

Use cases

• make fast HTTP requests from Node.js
• replace Node's built-in fetch with a faster implementation
• polyfill fetch and web standard APIs globally
• pool and reuse HTTP connections for high throughput
• make requests through HTTP or SOCKS5 proxies
• mock HTTP requests in tests
• stream HTTP response bodies
• retry failed requests automatically

When to choose

• you need maximum HTTP client performance in Node.js with pipelining and keep-alive
• you want consistent, spec-compliant fetch/WebSocket/EventSource behavior across Node versions
• you need fine-grained control over connections, pooling, proxies, or retries
• you want to mock HTTP calls in your test suite

When to avoid

• you only need simple, occasional HTTP requests and built-in fetch suffices
• you need HTTP/2 or HTTP/3 client features as the primary protocol
• you are not on Node.js
• you need a browser-side HTTP client

Facets

library · maturity stable

http-client web-framework testing mocking web-development backend apis developer-tools http1.1 fetch websocket eventsource connection-pooling proxy-support whatwg-standards high-performance nodejs javascript

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