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Is bser ESM-only? Can you require() it?

JavaScript implementation of the BSER Binary Serialization

Last verified Sep 9, 2026 against bser@2.1.1. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

bser ships CommonJS only. require("bser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "bser" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

What to do

  1. require("bser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import bser from "bser"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/bser
Latest
2.1.1 (Oct 22, 2019)
Module format
CommonJS
Last CommonJS version
2.1.1
TypeScript types
@types/bser
Node engines
not declared
Weekly downloads
34.0M
License
Apache-2.0

Does bser@2.1.1 actually load? Runtime test results

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

Runtimerequire("bser")import "bser"
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 bser

ES modules (import)

import bser from "bser";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const bser = require("bser");

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 (7 versions; the newest 7 shown).

VersionsFormatFirst published
1.0.0 – 2.1.1CommonJSAug 24, 2015

Frequently asked

Is bser ESM-only?

bser@2.1.1 is a CommonJS package. bser ships CommonJS only. require("bser") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "bser" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import bser with ES module syntax?

Yes. import bser from "bser" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does bser work in Bun?

Yes. import "bser" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does bser ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/bser".

Links

Other commonjs packages

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