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🌐 Go package providing comprehensive country data in all standard ISO formats

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# 🗺️&nbsp;&nbsp;go-countries

**Go package providing comprehensive country data in all standard ISO formats.**

<br/>

<br/>

<table align="center" border="0">
  <tr>
    <td align="right">
       <code>CI / CD</code> &nbsp;&nbsp;
    </td>
    <td align="left">
       <a href="https://github.com/mrz1836/go-countries/actions"><img src="https://img.shields.io/github/actions/workflow/status/mrz1836/go-countries/fortress.yml?branch=master&label=build&logo=github&style=flat-square" alt="Build"></a>
       <a href="https://github.com/mrz1836/go-countries/actions"><img src="https://img.shields.io/github/last-commit/mrz1836/go-countries?style=flat-square&logo=git&logoColor=white&label=last%20update" alt="Last Commit"></a>
    </td>
    <td align="right">
       &nbsp;&nbsp;&nbsp;&nbsp; <code>Quality</code> &nbsp;&nbsp;
    </td>
    <td align="left">
       <a href="https://codecov.io/gh/mrz1836/go-countries"><img src="https://codecov.io/gh/mrz1836/go-countries/branch/master/graph/badge.svg?style=flat-square" alt="Coverage"></a>
    </td>
  </tr>

<tr>
    <td align="right">
       <code>Security</code> &nbsp;&nbsp;
    </td>
    <td align="left">
       <a href="https://scorecard.dev/viewer/?uri=github.com/mrz1836/go-countries"><img src="https://api.scorecard.dev/projects/github.com/mrz1836/go-countries/badge?style=flat-square" alt="Scorecard"></a>
       <a href=".github/SECURITY.md"><img src="https://img.shields.io/badge/policy-active-success?style=flat-square&logo=security&logoColor=white" alt="Security"></a>
    </td>
    <td align="right">
       &nbsp;&nbsp;&nbsp;&nbsp; <code>Community</code> &nbsp;&nbsp;
    </td>
    <td align="left">
       <a href="https://github.com/mrz1836/go-countries/graphs/contributors"><img src="https://img.shields.io/github/contributors/mrz1836/go-countries?style=flat-square&color=orange" alt="Contributors"></a>
       <a href="https://mrz1818.com/"><img src="https://img.shields.io/badge/donate-bitcoin-ff9900?style=flat-square&logo=bitcoin" alt="Bitcoin"></a>
    </td>
  </tr>
</table>

</div>

### <code>Project Navigation</code>

</div>

<table align="center">
  <tr>
    <td align="center" width="33%">
       🚀&nbsp;<a href="#-installation"><code>Installation</code></a>
    </td>
    <td align="center" width="33%">
       🧪&nbsp;<a href="#-examples--tests"><code>Examples&nbsp;&&nbsp;Tests</code></a>
    </td>
    <td align="center" width="33%">
       📚&nbsp;<a href="#-documentation"><code>Documentation</code></a>
    </td>
  </tr>
  <tr>
    <td align="center">
       🤝&nbsp;<a href="#-contributing"><code>Contributing</code></a>
    </td>
    <td align="center">
      🛠️&nbsp;<a href="#-code-standards"><code>Code&nbsp;Standards</code></a>
    </td>
    <td align="center">
      ⚡&nbsp;<a href="#-benchmarks"><code>Benchmarks</code></a>
    </td>
  </tr>
  <tr>
    <td align="center">
      🤖&nbsp;<a href="#-ai-usage--assistant-guidelines"><code>AI&nbsp;Usage</code></a>
    </td>
    <td align="center">
       ⚖️&nbsp;<a href="#-license"><code>License</code></a>
    </td>
    <td align="center">
       👥&nbsp;<a href="#-maintainers"><code>Maintainers</code></a>
    </td>
  </tr>
</table>
<br/>

## 📦 Installation

**go-countries** requires a [supported release of Go](https://golang.org/doc/devel/release.html#policy).

```bash script
go get -u github.com/mrz1836/go-countries
```
<br/>

## 💡 Usage

Here is a basic example of how to use go-countries in your Go project:

```go
package main

import (
    "fmt"
    "github.com/mrz1836/go-countries"
)

func main() {
    country := countries.GetByAlpha2(countries.Alpha2US)
    if country != nil {
        fmt.Printf("Country: %s, Capital: %s\n", country.Name, country.Capital)
    } else {
        fmt.Println("Country not found")
    }
}
```

- Explore additional [usage examples](examples) for practical integration patterns
- Review [benchmark results](countries_test.go) to assess performance characteristics
- Examine the comprehensive [test suite](countries_test.go) for validation and coverage
- Inspect the [code generator](generate) for details on data sources and the build process

<br/>

## 📚 Documentation

View the generated [documentation](https://pkg.go.dev/github.com/mrz1836/go-countries?tab=doc)

> **Heads up!** `go-countries` is intentionally light on dependencies. The only
external package it uses is the excellent `testify` suite—and that's just for
our tests. You can drop this library into your projects without dragging along
extra baggage.

<br/>

### Features

- Comprehensive list of all recognized countries, provided as a Go slice of structs for easy access and manipulation
- Direct access to raw country and currency JSON data in the [data package](data) for custom processing or validation
- Zero `init()` overhead—just import and use the `countries` package without side effects
- Fast, allocation-free lookups for all retrieval functions, ensuring optimal performance in production environments
- Includes region, subregion, capital, and currency information for each country
- Designed for extensibility—add or update country data via code generation from JSON sources
- Well-documented, tested, and benchmarked for reliability and speed

<br/>

### Functions
- [`GetAll()`](countries.go): Retrieve the entire slice of all known countries, including metadata such as names, codes, regions, capitals, and currencies
- [`GetByAlpha2(countries.Alpha2US)`](countries.go): Find a country by its [ISO 3166-1 alpha-2 code](https://en.wikipedia.org/wiki/ISO_3166-2)
- [`GetByAlpha3(countries.Alpha3USA)`](countries.go): Retrieve a country by its [ISO 3166-1 alpha-3 code](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-3)
- [`GetByCapital("Washington")`](countries.go): Find a country by its capital city in a case-insensitive search
- [`GetByCountryCode("840")`](countries.go): Lookup by [ISO 3166 numeric country code](https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes), supporting string or integer input
- [`GetByISO31662("ISO 3166-2:US")`](countries.go): Retrieve a country by its [ISO 3166-2 subdivision code](https://en.wikipedia.org/wiki/ISO_3166-2)
- [`GetByName("United States of America")`](countries.go): Lookup a country by its [official name](https://en.wikipedia.org/wiki/ISO_3166), supporting case-insensitive queries

<br/>

### Code Generation

If you need to update the country data or regenerate the Go code, you can use the `go generate` command.
This will read the JSON data files and generate a Go file containing all the country data in a structured format.

To generate the Go code for the country data, follow these steps:

1. **Navigate to the project root directory**:

```bash
   cd /path/to/your/project
   ```

2. **Run the `go generate` command**:

```bash
   go generate -x ./generate/...
   ```

This command executes the code generation logic defined in the `generate.go` file located in the `/generate/` directory.
The generated code is written to `countries_data.go` in the project directory.

<br/>

### Additional Documentation & Repository Management

<details>
<summary><strong><code>Development Setup (Getting Started)</code></strong></summary>
<br/>

Install [MAGE-X](https://github.com/mrz1836/mage-x) build tool for development:

```bash
# Install MAGE-X for development and building
go install github.com/mrz1836/mage-x/cmd/magex@latest
magex update:install
```
</details>

<details>
<summary><strong><code>Library Deployment</code></strong></summary>
<br/>

This project uses [goreleaser](https://github.com/goreleaser/goreleaser) for streamlined binary and library deployment to GitHub. To get started, install it via:

```bash
brew install goreleaser
```

The release process is defined in the [.goreleaser.yml](.goreleaser.yml) configuration file.

Then create and push a new Git tag using:

```bash
magex version:bump bump=patch push=true branch=master
```

This process ensures consistent, repeatable releases with properly versioned artifacts and citation metadata.

</details>

<details>
<summary><strong><code>Build Commands</code></strong></summary>
<br/>

View all build commands

```bash script
magex help
```

</details>

<details>
<summary><strong><code>GitHub Workflows</code></strong></summary>
<br/>

All workflows are driven by modular configuration in [`.github/env/`](.github/env/README.md) — no YAML editing required.

**[View all workflows and the control center →](.github/docs/workflows.md)**

</details>

<details>
<summary><strong><code>Updating Dependencies</code></strong></summary>
<br/>

To update all dependencies (Go modules, linters, and related tools), run:

```bash
magex deps:update
```

This command ensures all dependencies are brought up to date in a single step, including Go modules and any managed tools. It is the recommended way to keep your development environment and CI in sync with the latest versions.

</details>

<br/>

## 🧪 Examples & Tests

All unit tests and [examples](examples) run via [GitHub Actions](https://github.com/mrz1836/go-template/actions) and use [Go version 1.22.x](https://go.dev/doc/go1.22). View the [configuration file](.github/workflows/fortress.yml).

Run all tests (fast):

```bash script
magex test
```

Run all tests with race detector (slower):
```bash script
magex test:race
```

<br/>

## ⚡ Benchmarks

Run the Go [benchmarks](countries_test.go):

```bash script
magex bench
```

<br/>

Performance benchmarks for the core functions in this library, executed on an Apple M1 Max (ARM64):

| Function                           | Ops/sec (approx) | Time per op | Allocations | Bytes Allocated |
|------------------------------------|------------------|-------------|-------------|-----------------|
| [`GetAll`](countries.go)           | 5,263,413        | 225.4 ns    | 1           | 2,048 B         |
| [`GetByAlpha2`](countries.go)      | 100,000,000      | 10.36 ns    | 0           | 0 B             |
| [`GetByAlpha3`](countries.go)      | 100,000,000      | 10.97 ns    | 0           | 0 B             |
| [`GetByCapital`](countries.go)     | 33,426,183       | 35.19 ns    | 1           | 16 B            |
| [`GetByCountryCode`](countries.go) | 100,467,049      | 11.10 ns    | 0           | 0 B             |
| [`GetByISO31662`](countries.go)    | 59,682,316       | 20.16 ns    | 0           | 0 B             |
| [`GetByName`](countries.go)        | 46,466,527       | 25.66 ns    | 0           | 0 B             |

> These benchmarks reflect fast, allocation-free lookups for most retrieval functions, ensuring optimal performance in production environments.

<br/>

## 🛠️ Code Standards
Read more about this Go project's [code standards](.github/CODE_STANDARDS.md).

<br/>

## 🤖 AI Usage & Assistant Guidelines
Read the [AI Usage & Assistant Guidelines](.github/tech-conventions/ai-compliance.md) for details on how AI is used in this project and how to interact with AI assistants.

<br/>

## 🙏 Credits
Used: [ISO-3166-Countries-with-Regional-Codes](https://github.com/lukes/ISO-3166-Countries-with-Regional-Codes)
Used: [List of Countries & Currencies](https://gist.github.com/tiagodealmeida/0b97ccf117252d742dddf098bc6cc58a)

<br/>

## 👥 Maintainers
| [<img src="https://github.com/mrz1836.png" height="50" alt="MrZ" />](https://github.com/mrz1836) |
|:------------------------------------------------------------------------------------------------:|
|                                [MrZ](https://github.com/mrz1836)                                 |

<br/>

## 🤝 Contributing
View the [contributing guidelines](.github/CONTRIBUTING.md) and please follow the [code of conduct](.github/CODE_OF_CONDUCT.md).

### How can I help?
All kinds of contributions are welcome :raised_hands:!
The most basic way to show your support is to star :star2: the project, or to raise issues :speech_balloon:.
You can also support this project by [becoming a sponsor on GitHub](https://github.com/sponsors/mrz1836) :clap:
or by making a [**bitcoin donation**](https://mrz1818.com/?tab=tips&utm_source=github&utm_medium=sponsor-link&utm_campaign=go-countries&utm_term=go-countries&utm_content=go-countries) to ensure this journey continues indefinitely! :rocket:

[![Stars](https://img.shields.io/github/stars/mrz1836/go-countries?label=Please%20like%20us&style=social)](https://github.com/mrz1836/go-countries/stargazers)

<br/>

## 📝 License

[![License](https://img.shields.io/github/license/mrz1836/go-countries.svg?style=flat)](https://raw.githubusercontent.com/mrz1836/go-countries/master/LICENSE)

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