# @stdlib/napi-argv

> C utilities for retrieving Node-API add-on callback arguments.

Latest version **0.2.3** (published 2026-02-04) · Apache-2.0 license · 0 weekly downloads

## Install

```sh
npm install @stdlib/napi-argv
pnpm add @stdlib/napi-argv
yarn add @stdlib/napi-argv
bun add @stdlib/napi-argv
```

## Health

**Score 55/100 (C)** — status: stable.

Positive: has types; no vulnerabilities; high maintenance score.

Warnings: low downloads; no esm support; pre 1.0.

## Facts

| | |
|---|---|
| Version | 0.2.3 |
| Published | 2026-02-04 |
| First published | 2023-09-23 |
| Weekly downloads | 0 |
| License | Apache-2.0 |
| TypeScript types | bundled |
| Module format | CommonJS |
| Node | >=0.10.0 |
| Dependencies | 1 |
| Unpacked size | 28.8 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 1 |
| Author | The Stdlib Authors |
| Maintainers | stdlib-bot, kgryte, planeshifter, rreusser |
| Keywords | stdlib, napi, native, addon, utilities, utils, macros |

## Links

- npm: https://www.npmjs.com/package/@stdlib/napi-argv
- Repository: https://github.com/stdlib-js/napi-argv
- Homepage: https://stdlib.io
- Issues: https://github.com/stdlib-js/stdlib/issues
- Funding: https://opencollective.com/stdlib
- npm.io page: https://npm.io/package/@stdlib/napi-argv

## Dependencies (1)

- [@stdlib/assert-napi-status-ok](https://npm.io/package/@stdlib/assert-napi-status-ok.md) ^0.2.2

## Recent versions

- 0.2.3 (latest) — 2026-02-04
- 0.2.2 — 2024-07-27
- 0.2.1 — 2024-02-22
- 0.2.0 — 2024-02-14
- 0.1.1 — 2023-10-04
- 0.1.0 — 2023-09-23

## README

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@license Apache-2.0

Copyright (c) 2022 The Stdlib Authors.

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<details>
  <summary>
    About stdlib...
  </summary>
  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
  <p>The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.</p>
  <p>When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.</p>
  <p>To join us in bringing numerical computing to the web, get started by checking us out on <a href="https://github.com/stdlib-js/stdlib">GitHub</a>, and please consider <a href="https://opencollective.com/stdlib">financially supporting stdlib</a>. We greatly appreciate your continued support!</p>
</details>

# argv

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> C utilities for retrieving Node-API add-on callback arguments.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/napi-argv
```

</section>

<section class="usage">

## Usage

```javascript
var headerDir = require( '@stdlib/napi-argv' );
```

#### headerDir

Absolute file path for the directory containing header files for C APIs.

```javascript
var dir = headerDir;
// returns <string>
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

```javascript
var headerDir = require( '@stdlib/napi-argv' );

console.log( headerDir );
// => <string>
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/napi/argv.h"
```

#### STDLIB_NAPI_ARGV( env, info, argv, argc, nargs )

Macro for retrieving add-on callback arguments.

```c
#include <node_api.h>

// ...

static napi_value addon( napi_env env, napi_callback_info info ) {
    // Retrieve callback arguments:
    STDLIB_NAPI_ARGV( env, info, argv, argc, 6 );

    // ...
}
```

The macro expects the following arguments:

-   **env**: environment under which the callback is invoked.
-   **info**: callback data.
-   **argv**: variable name for storing argument values.
-   **argc**: variable name for storing the number of provided arguments.
-   **nargs**: expected number of arguments.

If the number of provided arguments does **not** equal the expected number of arguments, the macro's generated code raises an exception.

#### STDLIB_NAPI_ARGV_INDEX2ORDINAL( index )

Macro for converting an index to an ordinal numeral.

```c
STDLIB_NAPI_ARGV_INDEX2ORDINAL( 2 )
```

The macro expects the following arguments:

-   **index**: argument index value.

The first few ordinal numerals are as follows:

-   `STDLIB_NAPI_ARGV_INDEX2ORDINAL( 0 )`: "First".
-   `STDLIB_NAPI_ARGV_INDEX2ORDINAL( 1 )`: "Second".
-   `STDLIB_NAPI_ARGV_INDEX2ORDINAL( 2 )`: "Third".
-   `STDLIB_NAPI_ARGV_INDEX2ORDINAL( 3 )`: "Fourth".
-   `STDLIB_NAPI_ARGV_INDEX2ORDINAL( 4 )`: "Fifth".
-   ...
-   `STDLIB_NAPI_ARGV_INDEX2ORDINAL( 29 )`: "Thirtieth".

This macro can be useful when generating error messages which state which argument is invalid (e.g., "invalid argument. **First** argument must be a number." ).

</section>

<!-- /.usage -->

<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

</section>

<!-- /.notes -->

<!-- C API usage examples. -->

<section class="examples">

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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<section class="references">

</section>

<!-- /.references -->

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<section class="related">

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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[npm-image]: http://img.shields.io/npm/v/@stdlib/napi-argv.svg
[npm-url]: https://npmjs.org/package/@stdlib/napi-argv

[test-image]: https://github.com/stdlib-js/napi-argv/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/napi-argv/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/napi-argv/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/napi-argv?branch=main

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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/napi-argv/main/LICENSE

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---
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