# Go quickstart

## 1. Install `hypertune-go-gen`

Once you have a Go application ready, install the `hypertune-go-gen` tool by running:

```bash
go get -tool github.com/hypertunehq/hypertune-go/cmd/hypertune-go-gen
```

## 2. Generate the client

Set the `HYPERTUNE_TOKEN` environment variable to your project token which you can find in the Settings tab of your project.

Then generate the client by running:

```bash
go tool hypertune-go-gen --token=${HYPERTUNE_TOKEN} --outputFileDir=pkg/hypertune
```

Alternatively, you can add the following `go generate` directive to one of your Go files to automatically re-generate the client when you run `go generate ./...`:

```go
//go:generate go tool hypertune-go-gen --token=${HYPERTUNE_TOKEN} --outputFileDir=pkg/hypertune
```

## 3. Use the client

Instantiate the client and evaluate your flags:

<pre class="language-go"><code class="lang-go"><strong>package main
</strong>
import (
	"fmt"
	"log"
	"os"

	// Update to your project path.
	"github.com/myTeam/myProject/pkg/hypertune"
)

func main() {
	if err := run(); err != nil {
		log.Fatal(err)
	}
}

func run() error {
 	var token = os.Getenv("HYPERTUNE_TOKEN")
	source, err := hypertune.CreateSource(&#x26;token)
	if err != nil {
		return err
	}
	defer source.Close()

	source.WaitForInitialization()

	rootNode := source.Root(hypertune.RootArgs{
		Context: hypertune.Context{
			Environment: hypertune.Development,
			User: hypertune.User{
				Id:    "test_id",
				Name:  "Test",
				Email: "hi@test.com",
			},
		},
	})

	fmt.Printf("ExampleFlag: %v\n", rootNode.ExampleFlag(false))

	return nil
}
</code></pre>

## Next steps

Now you can update the logic for `ExampleFlag` from the Hypertune UI without updating your code or waiting for a new build, deployment, app release, or service restart.

To add a new flag, create it in the Hypertune UI then regenerate the client.


---

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