Launched: Client-Side Node.js and Server-Side C SDKs


We’re excited to announce two new LaunchDarkly SDKs: the client-side SDK for Node.js and server-side SDK for C! With this announcement, the two SDKs have been promoted to general availability (GA).

Although these SDKs are new to LaunchDarkly, the underlying technologies – Node.js and C – were already supported by our server-side Node.js SDK and client-side C SDK. With this in mind, you might be wondering about the difference between client-side and server-side SDKs.

In a nutshell:

  • LaunchDarkly’s client-side SDKs are designed for single-user contexts typically distributed as desktop, mobile, and embedded applications.
  • LaunchDarkly’s server-side SDKs are designed for multi-user systems such as web application servers.

Take a look at our documentation to learn more about the implications of using our client-side and server-side SDKs.

With this understanding in mind, we see that both of the SDKs expand support for using LaunchDarkly to new sets of software. The client-side SDK for Node.js expands our support for Node.js to client-side applications such as desktop applications or apps running on Node.js-enabled devices. The server-side SDK for C expands our support for C and C++ to server-side applications built in C or C++ which handle many concurrent users.

Check out the client-side Node.js and server-side C SDK reference guides for information on how to get started. If you have questions, please reach out to our support team at

Ben Woskow
Ben is an Engineering Manager at LaunchDarkly. Prior to LaunchDarkly, he spent many years building the Atlassian Marketplace and running its engineering team. In his free time, Ben can often be found trail running in the Oakland hills.