canirequire › CommonJS › bser
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. JSON
CommonJS CommonJS — require() works on every Node.js version
bser ships CommonJS only. require("bser") works everywhere. 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.
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.
| Runtime | require("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 | ✓ 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 (7 versions; the newest 7 shown).
| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 2.1.1 | CommonJS | Aug 24, 2015 |
Frequently asked
Is bser ESM-only?
bser@2.1.1 is a CommonJS package. bser ships CommonJS only. require("bser") works everywhere. 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 on Sep 9, 2026.
Does bser ship TypeScript types?
Not bundled. Install the community types with "npm install -D @types/bser".
Links
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