Skip to main content
Version: v1.29.0

Using the GO module


go get

Create a feature flag configuration

Create a new YAML file containing your first flag configuration.

# 20% of the users will use the variation "my-new-feature"
my-new-feature: true
my-old-feature: false
my-new-feature: 20
my-old-feature: 80

This flag split the usage of this flag, 20% will use the variation my-new-feature and 80% the variation my-old-feature.

SDK Initialisation

First, you need to initialize the ffclient with the location of your backend file.

err := ffclient.Init(ffclient.Config{
PollingInterval: 3 * time.Second,
Retriever: &fileretriever.Retriever{
Path: "flag-config.goff.yaml",
defer ffclient.Close()

This example will load a file from your local computer and will refresh the flags every 3 seconds (if you omit the PollingInterval, the default value is 60 seconds).


This is a basic configuration to test locally, in production it is better to use a remote place to store your feature flag configuration file.

Look at the list of available options in the Store your feature flag file page.

Evaluate your flags

Now you can evaluate your flags anywhere in your code.

user := ffcontext.NewEvaluationContext("user-unique-key")
hasFlag, _ := ffclient.BoolVariation("test-flag", user, false)
if hasFlag {
// flag "test-flag" is true for the user
} else {
// flag "test-flag" is false for the user

You can find more examples in the examples/ directory.

Get the latest GO Feature Flag updates