undici

How to get involved

Install

Benchmarks

HTTP/1.1

HTTP/1.1 over HTTPS

HTTP/2

Undici vs. Fetch

Overview

Built-in Fetch (Node.js v18+)

Undici Module

When to Use Each

Use Built-in Fetch When:

Use Undici Module When:

Performance Comparison

Migration Guide

Keep `fetch` and `FormData` together

Version Compatibility

Quick Start

Basic Request

Using Cache Interceptor

Key Features:

Global Installation

Body Mixins

Common API Methods

`undici.request([url, options]): Promise`

`undici.stream([url, options, ]factory): Promise`

`undici.pipeline([url, options, ]handler): Duplex`

`undici.connect([url, options]): Promise`

`undici.fetch(input[, init]): Promise`

`request.body`

`request.duplex`

`response.body`

Specification Compliance

CORS

Garbage Collection

Forbidden and Safelisted Header Names

Content-Encoding

`undici.upgrade([url, options]): Promise`

`undici.setGlobalDispatcher(dispatcher)`

`undici.getGlobalDispatcher()`

`undici.setGlobalOrigin(origin)`

`undici.getGlobalOrigin()`

`UrlObject`

Expect

Pipelining

Manual Redirect

Workarounds

Network address family autoselection.

Collaborators

Past Collaborators

Releasers

Long Term Support

License