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2.6.1 • Public • Published


Koffi is a fast and easy-to-use C FFI module for Node.js, featuring:

  • Low-overhead and fast performance (see benchmarks)
  • Support for primitive and aggregate data types (structs and fixed-size arrays), both by reference (pointer) and by value
  • Javascript functions can be used as C callbacks (since 1.2.0)
  • Well-tested code base for popular OS/architecture combinations

The following combinations of OS and architectures are officially supported and tested at the moment:

ISA / OS Windows Linux macOS FreeBSD OpenBSD
x86 (IA32) 1 ✅ Yes ✅ Yes ⬜️ N/A ✅ Yes ✅ Yes
x86_64 (AMD64) ✅ Yes ✅ Yes ✅ Yes ✅ Yes ✅ Yes
ARM32 LE 2 ⬜️ N/A ✅ Yes ⬜️ N/A 🟨 Probably 🟨 Probably
ARM64 (AArch64) LE ✅ Yes ✅ Yes ✅ Yes ✅ Yes 🟨 Probably
RISC-V 64 3 ⬜️ N/A ✅ Yes ⬜️ N/A 🟨 Probably 🟨 Probably

Go to the web site for more information: https://koffi.dev/

Project history

You can consult the changelog on the official website.

Major version increments can include breaking API changes, use the migration guide for more information.


This program is free software: you can redistribute it and/or modify it under the terms of the MIT License.

Find more information here: https://choosealicense.com/licenses/mit/

  1. The following call conventions are supported: cdecl, stdcall, MS fastcall, thiscall.

  2. The prebuilt binary uses the hard float ABI and expects a VFP coprocessor. Build from source to use Koffi with a different ABI (softfp, soft).

  3. The prebuilt binary uses the LP64D (double-precision float) ABI. The LP64 ABI is supported in theory if you build Koffi from source but this is untested. The LP64F ABI is not supported.

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