indutny/bn.js

Health v2 · maintenance only

Adoption not part of the score

1230 stars · 154 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

bn.js is a pure JavaScript arbitrary-precision integer (BigNum) arithmetic library supporting addition, multiplication, modular reduction, Montgomery reduction, and bit operations. It runs in both Node.js and browsers with no native dependencies.

Use cases

• do big integer arithmetic in javascript
• implement cryptography like RSA or ECC in JS
• handle numbers larger than Number.MAX_SAFE_INTEGER
• perform modular arithmetic and Montgomery multiplication
• convert big integers between bases and byte arrays

When to choose

• you need arbitrary-precision integers in Node.js or the browser without native modules
• you need a battle-tested bignum library used by crypto libraries like elliptic
• you need integer-only math (no decimals) with in-place operation optimizations

When to avoid

• you need decimal or floating-point arithmetic
• you need BigInt-level performance and can use native JS BigInt instead
• you need arbitrary-precision decimals like for financial calculations

Facets

library · maturity stable

math serialization developer-tools browser cross-platform bignum arbitrary-precision-arithmetic biginteger montgomery-reduction pure-javascript algorithms cryptography nodejs javascript

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