canirequire

canirequire › Dual (CommonJS + ESM) › socket.io-client

Is socket.io-client ESM-only? Can you require() it?

Realtime application framework client

Last verified Sep 9, 2026 against socket.io-client@4.8.3. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

socket.io-client publishes both a CommonJS entry and a native ESM entry (ESM added in 3.0.0). require("socket.io-client") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.0.0. import "socket.io-client" works alongside it.

What to do

  1. Nothing to change. require("socket.io-client") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.0.0. import * as socketIoClient from "socket.io-client" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
4.8.3 (Dec 23, 2025)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
4.8.3
Native ESM since
3.0.0
TypeScript types
Bundled
Node engines
>=10.0.0
Weekly downloads
12.7M
License
MIT

Does socket.io-client@4.8.3 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("socket.io-client") from a CommonJS file and import "socket.io-client" from an ES module.

Runtimerequire("socket.io-client")import "socket.io-client"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4.0✓ works✓ works

How to import socket.io-client

ES modules (import)

import * as socketIoClient from "socket.io-client";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const socketIoClient = require("socket.io-client");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (119 versions; the newest 60 shown).

VersionsFormatFirst published
3.0.0 – 4.8.3Dual (CommonJS + ESM)Nov 5, 2020
1.5.1 – 2.5.0CommonJSOct 24, 2016

Frequently asked

Is socket.io-client ESM-only?

socket.io-client@4.8.3 ships CommonJS and ESM builds. socket.io-client publishes both a CommonJS entry and a native ESM entry (ESM added in 3.0.0). require("socket.io-client") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.0.0. import "socket.io-client" works alongside it.

Can I require socket.io-client?

Yes. socket.io-client ships a CommonJS entry alongside the native ESM entry. require("socket.io-client") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.0.0.

Does socket.io-client work in Bun?

Yes. import "socket.io-client" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does socket.io-client ship TypeScript types?

Yes. socket.io-client bundles its own type declarations; no @types package is needed.

Links

Other dual (commonjs + esm) packages

Similar popularity