Manage Node.js Flags with Ease

Reduce risk, iterate quicker, and get more control with LaunchDarkly
Node.js feature flag management. Try it out free with a 30-day trial.

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Feature flag lifecycle management
technical debt
Manage feature flags at enterprise scale across multiple dev environments with flag statuses, audit logging, and custom roles
Feature toggle user and performance feedback
Release faster
with less risk
Reduce risk to customer impact by releasing to limited user segments and testing your infrastructure behind feature flags
Feature flags kill switch and feature toggles
Central platform
for controlling features
LaunchDarkly’s user interface allows non-technical users to control user targeting and implement feature flagging best practices

Node.js Feature Flags

Let's create a Node feature flag for a "One Click Checkout"

1.Install the SDK with npm

Check out our open source Node SDK on GitHub or read through the reference documentation.

       npm install ldclient-node --save

2.Create a new LaunchDarkly client

       ldclient = LaunchDarkly.init("YOUR_SDK_KEY"))

3.Create a feature flag in LaunchDarkly

A flag allows you to manage a feature from the LaunchDarkly dashboard.

4.Wrap your code with a feature flag

First, create a user.  You can pass us any data about users for targeting and segmentation. 
Then, call variation and see whether the flag is on for that user.

        var user = {
          "firstName": "Bob",
          "lastName": "Loblaw",
          "key": "",
          "custom": {
            "groups": "beta_testers"

        ldclient.variation("one_click_checkout", user, false, function(err, showFeature) {
          if (showFeature) {
            // application code to show One Click Checkout
            console.log("Showing your feature to " + user.key );
          } else {
            // the code to run if the feature is off
            console.log("Not showing your feature to " + user.key);

5.Manage your flag

Use LaunchDarkly to determine which users see the feature.
You can roll out to a percentage of your users or target individual users/groups.

  • LaunchDarkly Testimonial
    I believe that feature flags are a critical piece of modern development, and LaunchDarkly brings this part of continuous delivery to the masses.
    - Rob Zuber, CTO, CircleCI
    LaunchDarkly Testimonial
    LaunchDarkly has been easy to on-board and integrate into our existing development cycle, which has helped us move faster with less risk.
    - Lawrence, VP Engineering, Ten-X

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