What is node-addon-api?
The node-addon-api package is a helper library for building Node.js Addons in C++. It provides a C++ API that abstracts away the complexities of working with the low-level V8 and N-API provided by Node.js, making it easier to develop native addons.
What are node-addon-api's main functionalities?
Object Wrapping
Object wrapping allows C++ classes to be represented as JavaScript objects. It provides an easy way to create and manage objects that have a one-to-one relationship with C++ objects.
Napi::ObjectReference MyClass::constructor;
MyClass::MyClass(const Napi::CallbackInfo& info) : Napi::ObjectWrap<MyClass>(info) {
// constructor implementation
}
Napi::Object MyClass::Init(Napi::Env env, Napi::Object exports) {
Napi::HandleScope scope(env);
Napi::Function func = DefineClass(env, "MyClass", {
InstanceMethod("myMethod", &MyClass::MyMethod)
});
constructor = Napi::Persistent(func);
constructor.SuppressDestruct();
exports.Set("MyClass", func);
return exports;
}
Function Arguments
The package provides a way to handle function arguments passed from JavaScript to C++ with type checking and conversion utilities.
Napi::Value MyFunction(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
if (info.Length() < 2) {
Napi::TypeError::New(env, "Expected at least two arguments").ThrowAsJavaScriptException();
}
Napi::String arg0 = info[0].As<Napi::String>();
double arg1 = info[1].As<Napi::Number>().DoubleValue();
// function implementation
return Napi::String::New(env, "result");
}
Asynchronous Operations
node-addon-api provides utilities for performing asynchronous operations, allowing long-running tasks to be executed without blocking the Node.js event loop.
class MyAsyncWorker : public Napi::AsyncWorker {
public:
MyAsyncWorker(Napi::Function& callback) : AsyncWorker(callback) {}
void Execute() override {
// Do work in another thread
}
void OnOK() override {
Napi::HandleScope scope(Env());
Callback().Call({Env().Null(), Napi::String::New(Env(), "Success")});
}
};
Napi::Value RunAsyncWork(const Napi::CallbackInfo& info) {
Napi::Function callback = info[0].As<Napi::Function>();
MyAsyncWorker* worker = new MyAsyncWorker(callback);
worker->Queue();
return info.Env().Undefined();
}
Other packages similar to node-addon-api
nan
The 'nan' package is a header file filled with macros and utilities for making addon development for different versions of V8 easier. It predates N-API and node-addon-api, and while it's still used, node-addon-api is recommended for most cases due to its simpler API and direct support for N-API.
ffi-napi
The 'ffi-napi' package allows for calling foreign functions of dynamic libraries from Node.js. It is similar to node-addon-api in that it allows for native functionality in Node.js, but it focuses on interfacing with existing libraries rather than writing new native modules.
neon
The 'neon' package is a Rust framework for writing safe and fast native Node.js modules. Like node-addon-api, it simplifies the process of writing native addons but does so using Rust instead of C++.
node-addon-api module
This module contains header-only C++ wrapper classes which simplify
the use of the C based N-API
provided by Node.js when using C++. It provides a C++ object model
and exception handling semantics with low overhead.
N-API is an ABI stable C interface provided by Node.js for building native
addons. It is independent from the underlying JavaScript runtime (e.g. V8 or ChakraCore)
and is maintained as part of Node.js itself. It is intended to insulate
native addons from changes in the underlying JavaScript engine and allow
modules compiled for one version to run on later versions of Node.js without
recompilation.
The node-addon-api
module, which is not part of Node.js, preserves the benefits
of the N-API as it consists only of inline code that depends only on the stable API
provided by N-API. As such, modules built against one version of Node.js
using node-addon-api should run without having to be rebuilt with newer versions
of Node.js.
It is important to remember that other Node.js interfaces such as
libuv
(included in a project via #include <uv.h>
) are not ABI-stable across
Node.js major versions. Thus, an addon must use N-API and/or node-addon-api
exclusively and build against a version of Node.js that includes an
implementation of N-API (meaning a version of Node.js newer than 6.14.2) in
order to benefit from ABI stability across Node.js major versions. Node.js
provides an ABI stability guide containing a detailed explanation of ABI
stability in general, and the N-API ABI stability guarantee in particular.
As new APIs are added to N-API, node-addon-api must be updated to provide
wrappers for those new APIs. For this reason node-addon-api provides
methods that allow callers to obtain the underlying N-API handles so
direct calls to N-API and the use of the objects/methods provided by
node-addon-api can be used together. For example, in order to be able
to use an API for which the node-addon-api does not yet provide a wrapper.
APIs exposed by node-addon-api are generally used to create and
manipulate JavaScript values. Concepts and operations generally map
to ideas specified in the ECMA262 Language Specification.
Current version: 2.0.1
(See CHANGELOG.md for complete Changelog)
![NPM](https://nodei.co/npm-dl/node-addon-api.png?months=6&height=1)
Setup
API Documentation
The following is the documentation for node-addon-api.
Examples
Are you new to node-addon-api? Take a look at our examples
Tests
To run the node-addon-api tests do:
npm install
npm test
To avoid testing the deprecated portions of the API run
npm install
npm test --disable-deprecated
Debug
To run the node-addon-api tests with --debug
option:
npm run-script dev
If you want faster build, you might use the following option:
npm run-script dev:incremental
Take a look and get inspired by our test suite
Contributing
We love contributions from the community to node-addon-api.
See CONTRIBUTING.md for more details on our philosophy around extending this module.
More resource and info about native Addons
WG Members / Collaborators
Active
Emeritus
Licensed under MIT