undici

npmv8.10.2TypeScript

An HTTP/1.1 client, written from scratch for Node.js

Safe to adopt

Yes — undici scores well across adoption, maintenance, weight, supply chain, and licensing. 158.5M downloads per week and 15 known dependents. Last published 5 days ago. 50 releases in the last 2 years.

AAdoption: grade A, Excellent.
158.5M downloads per week and 15 known dependents.
AMaintenance: grade A, Excellent.
Last published 5 days ago. 50 releases in the last 2 years.
AWeight: grade A, Excellent.
Zero runtime dependencies, about 1.8 MB installed.
ASupply chain: grade A, Excellent.
No install scripts, 3 maintainers, and a contained dependency surface.
ALicense: grade A, Excellent.
MIT — permissive, with no copyleft found in the dependency tree.

Grades are computed deterministically from registry metadata collected by PackageGraph — downloads, dependents, publish dates, the resolved dependency tree, maintainer count, and declared licenses. No third-party scores are used.

Install cost

What you actually take on by adding undici to a project.

Direct dependencies

Runtime packages this one declares itself.

Total installed

Distinct packages in the full runtime tree, deduplicated the way a package manager would.

1.8 MB

Install size

Unpacked size of this package plus its entire runtime tree.

—

Tree depth

Longest resolved dependency chain below this package.

Compatibility

Node.js: node >=22.19.0
Module format: CommonJS only
TypeScript: Types included
Install scripts: None

Quick start

A usage example from the undici README.

jsFull README ↗

// Available globally in Node.js v18+
const response = await fetch('https://api.example.com/data');
const data = await response.json();

// Check the bundled undici version
console.log(process.versions.undici); // e.g., "5.28.4"

undici vs the alternatives

Packages solving a similar problem in the npm ecosystem, compared on the signals that drive an adoption decision.

Package	Weekly downloads	Dependents	License	Last release
undicithis page	158.5M	15	MIT	5 days ago
node-fetch	172.9M	9	MIT	1 day ago
cross-fetch	32.9M	2	MIT	1 day ago
@mswjs/interceptors	20.3M	1	MIT	1 day ago
axios	106.5M	4	MIT	1 day ago
make-fetch-happen	22.8M	1	ISC	1 day ago

Dependencies

Declared by undici v8.10.2. Runtime dependencies are installed with the package; dev dependencies are not.

Dev (22)

@fastify/busboy 3.2.2@matteo.collina/tspl ^0.2.0@metcoder95/https-pem ^1.0.0@sinonjs/fake-timers ^12.0.0 @types/node ^22.0.0 abort-controller ^3.0.0borp ^1.0.0c8 ^12.0.0cross-env ^10.0.0dns-packet ^5.4.0esbuild ^0.28.0 eslint ^9.9.0fast-check ^4.1.1husky ^9.0.7jest ^30.0.5jsondiffpatch ^0.7.3neostandard ^0.13.0node-forge ^1.3.1proxy ^4.0.0tsd ^0.33.0typescript ^6.0.2ws ^8.11.0

Used by

Popular packages that depend on undici.

cheerionpm

The fast, flexible & elegant library for parsing and manipulating HTML and XML.

↓ 24.1M/wk◈ 5 dependents⚖ MITTS

@mswjs/interceptorsnpm

Low-level network interception library for Node.js.

↓ 20.3M/wk◈ 1 dependents⚖ MITTS

fastifynpm

Fast and low overhead web framework, for Node.js

↓ 8.9M/wk◈ 4 dependents⚖ MITTS

@planetscale/databasenpm

A Fetch API-compatible PlanetScale database driver

↓ 0/wk◈ 1 dependents⚖ Apache-2.0TS

mswnpm

Seamless REST/GraphQL API mocking library for browser and Node.js.

↓ 0/wk◈ 5 dependents⚖ MITTS

@edge-runtime/primitivesnpm

A set of primitives to build Vercel Edge Runtime.

↓ 0/wk◈ 1 dependents⚖ MITTS

webdrivernpm

A Node.js bindings implementation for the W3C WebDriver and Mobile JSONWire Protocol

↓ 0/wk◈ 1 dependents⚖ MITTS

crosswsnpm

Cross-platform WebSocket Servers for Node.js, Deno, Bun and Cloudflare Workers

↓ 0/wk◈ 2 dependents⚖ MITTS

srvxnpm

Universal Server.

↓ 0/wk◈ 2 dependents⚖ MITTS

eventsourcenpm

WhatWG/W3C compliant EventSource client for Node.js and browsers

↓ 0/wk◈ 3 dependents⚖ MITTS

hononpm

Web framework built on Web Standards

↓ 0/wk◈ 4 dependents⚖ MITTS

mime-dbnpm

Media Type Database

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@react-native/dev-middlewarenpm

Dev server middleware for React Native

↓ 0/wk◈ 2 dependents⚖ MIT

light-my-requestnpm

Fake HTTP injection library

↓ 0/wk◈ 1 dependents⚖ BSD-3-ClauseTS

jsdomnpm

A JavaScript implementation of many web standards

↓ 0/wk◈ 20 dependents⚖ MIT

Relationship graph

Dependencies (left) and dependents (right) of undici.

undici dependencies dependents

Frequently installed together

@types/nodenpm

TypeScript definitions for node

↓ 0/wk◈ 327 dependents⚖ MITTS

vitestnpm

Next generation testing framework powered by Vite

↓ 92.7M/wk◈ 129 dependents⚖ MITTS

eslintnpm

An AST-based pattern checker for JavaScript.

↓ 138.4M/wk◈ 279 dependents⚖ MITTS

@types/wsnpm

TypeScript definitions for ws

↓ 0/wk◈ 21 dependents⚖ MITTS

node-forgenpm

JavaScript implementations of network transports, cryptography, ciphers, PKI, message digests, and various utilities.

↓ 0/wk◈ 5 dependents⚖ (BSD-3-Clause OR GPL-2.0)

expressnpm

Fast, unopinionated, minimalist web framework

↓ 92.8M/wk◈ 17 dependents⚖ MIT

@hono/node-servernpm

Node.js Adapter for Hono

↓ 0/wk◈ 4 dependents⚖ MITTS

@vitest/coverage-v8npm

V8 coverage provider for Vitest

↓ 0/wk◈ 52 dependents⚖ MITTS

https-proxy-agentnpm

An HTTP(s) proxy `http.Agent` implementation for HTTPS

↓ 225.1M/wk◈ 10 dependents⚖ MIT

get-port-pleasenpm

Get an available TCP port to listen

↓ 0/wk◈ 10 dependents⚖ MITTS

@cloudflare/workers-typesnpm

TypeScript typings for Cloudflare Workers

↓ 0/wk◈ 4 dependents⚖ MIT OR Apache-2.0TS

fastifynpm

Fast and low overhead web framework, for Node.js

↓ 8.9M/wk◈ 4 dependents⚖ MITTS

Release history

50 releases in the last two years, typically about 2 days apart.

Recent versions of undici
Version	Published	Size	License
7.29.1	5 days ago	1.6 MB	MIT
6.28.1	5 days ago	1.1 MB	MIT
8.10.2latest	5 days ago	1.8 MB	MIT
8.10.1	9 days ago	1.8 MB	MIT
8.10.0	1 month ago	1.8 MB	MIT
6.28.0	1 month ago	1.1 MB	MIT
7.29.0	1 month ago	1.6 MB	MIT
8.9.0	1 month ago	1.8 MB	MIT
8.8.0	1 month ago	1.8 MB	MIT
8.7.0	2 months ago	1.7 MB	MIT
8.6.0	2 months ago	1.7 MB	MIT
6.27.0	2 months ago	1.1 MB	MIT
7.28.0	2 months ago	1.5 MB	MIT
8.5.0	2 months ago	1.6 MB	MIT
8.4.1	3 months ago	1.6 MB	MIT

Overview

undici is an npm package that an HTTP/1.1 client, written from scratch for Node.js. It is extremely widely used, with about 158.5M downloads per week and 15 known dependents in the graph. The latest version is 8.10.2, released under the MIT license.

Who should use it

Teams working in the npm ecosystem who need an HTTP/1.1 client, written from scratch for Node.js and value a battle-tested, widely-adopted solution.

When not to use it

Consider an alternative if you need to minimize your dependency tree, or if a more actively-maintained option better fits your npm stack.

Pros

Large, well-established user base (158.5M weekly downloads).
Ships TypeScript type definitions.
Clear open-source license (MIT).

Cons

Large dependency tree (22 direct dependencies) increases install size and audit surface.

Auto-generated from collected registry metadata. No external claims are inferred.

Maintainers

ethan_arrowood matteo.collina ronag

Keywords

curl fetch http https promise request wget whatwg xhr

Frequently asked questions

Should I use undici?

How do I install undici?

Run `npm install undici` to add undici to your npm project.

What license is undici released under?

undici is distributed under the MIT license.

How popular is undici?

undici has approximately 158,539,585 downloads per week and 15 known dependent packages.

Is undici still maintained?

The most recent release of undici (v8.10.2) was published 5 days ago.

Does undici run install scripts?

No. undici does not define preinstall, install, or postinstall scripts, so installing it does not execute publisher-supplied code.