canirequire › CommonJS › bn.js
Is bn.js ESM-only? Can you require() it?
Big number implementation in pure javascript
Last verified Sep 9, 2026 against bn.js@5.2.5. JSON
CommonJS CommonJS — require() works on every Node.js version
bn.js ships CommonJS only. require("bn.js") works everywhere. import "bn.js" 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 bn.js@5.2.5 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("bn.js") from a CommonJS file and import "bn.js" from an ES module.
| Runtime | require("bn.js") | import "bn.js" |
|---|---|---|
| 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 bn.js
ES modules (import)
import bnJs from "bn.js";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 bnJs = require("bn.js");Module format by version
Derived from the type, main and exports fields of every stable release on npm (128 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 3.0.0 – 5.2.5 | CommonJS | Jul 7, 2015 |
Frequently asked
Is bn.js ESM-only?
bn.js@5.2.5 is a CommonJS package. bn.js ships CommonJS only. require("bn.js") works everywhere. import "bn.js" 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 bn.js with ES module syntax?
Yes. import bnJs from "bn.js" 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 bn.js work in Bun?
Yes. import "bn.js" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does bn.js ship TypeScript types?
Not bundled. Install the community types with "npm install -D @types/bn.js".
Links
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