https://github.com/launchdarkly/hello-node-server
Hello LaunchDarkly for Node.js (server-side)
https://github.com/launchdarkly/hello-node-server
examples feature-flags feature-toggles javascript launchdarkly launchdarkly-sdk managed-by-terraform node node-js nodejs sdk-examples
Last synced: 2 days ago
JSON representation
Hello LaunchDarkly for Node.js (server-side)
- Host: GitHub
- URL: https://github.com/launchdarkly/hello-node-server
- Owner: launchdarkly
- License: other
- Created: 2015-10-05T22:01:25.000Z (almost 11 years ago)
- Default Branch: main
- Last Pushed: 2026-07-13T14:26:14.000Z (12 days ago)
- Last Synced: 2026-07-13T16:15:23.979Z (12 days ago)
- Topics: examples, feature-flags, feature-toggles, javascript, launchdarkly, launchdarkly-sdk, managed-by-terraform, node, node-js, nodejs, sdk-examples
- Language: JavaScript
- Homepage:
- Size: 39.1 KB
- Stars: 5
- Watchers: 45
- Forks: 6
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
- Codeowners: CODEOWNERS
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- awesome-launchdarkly - Node.js Hello LaunchDarkly
README
# LaunchDarkly sample Node.js (server-side) application
We've built a simple console application that demonstrates how LaunchDarkly's SDK works.
Below, you'll find the build procedure. For more comprehensive instructions, you can visit your [Quickstart page](https://app.launchdarkly.com/quickstart#/) or the [Node.js (server-side) reference guide](https://docs.launchdarkly.com/sdk/server-side/node-js).
The LaunchDarkly server-side SDK for Node.js is designed primarily for use in multi-user systems such as web servers and applications. It follows the server-side LaunchDarkly model for multi-user contexts. It is not intended for use in desktop and embedded systems applications.
For a sample application demonstrating how to use LaunchDarkly in *client-side* Node.js applications, refer to our [Client-side Node.js SDK sample application](https://github.com/launchdarkly/hello-node-client).
## Build instructions
1. Set the environment variable `LAUNCHDARKLY_SDK_KEY` to your LaunchDarkly SDK key. If there is an existing boolean feature flag in your LaunchDarkly project that you want to evaluate, set `LAUNCHDARKLY_FLAG_KEY` to the flag key; otherwise, a boolean flag of `sample-feature` will be assumed.
```bash
export LAUNCHDARKLY_SDK_KEY="1234567890abcdef"
export LAUNCHDARKLY_FLAG_KEY="my-boolean-flag"
```
2. Install the LaunchDarkly Node.js SDK by running `npm install`
3. Run `node index.js`
You should receive the message "The feature flag evaluates to .". The application will run continuously and react to the flag changes in LaunchDarkly.