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LaunchDarkly is the leading feature management platform that enables teams to control feature releases with granular targeting rules, percentage rollouts, and experimentation. It supports server-side and client-side SDKs, provides real-time flag updates via streaming connections, and integrates with CI/CD pipelines. LaunchDarkly helps teams separate deployment from release, reducing risk and enabling data-driven feature decisions.
Release features to 1% of users, monitor error rates and performance, then gradually increase to 100% with automatic rollback if metrics degrade.
Run experiments with multivariate flags, assign users to cohorts, and measure the impact of feature variations on business metrics with statistical significance.
Wrap risky code paths in feature flags that can be toggled off instantly in production without a deployment, reducing mean time to recovery during incidents.
import * as LaunchDarkly from "@launchdarkly/node-server-sdk";const ldClient = LaunchDarkly.init(process.env.LAUNCHDARKLY_SDK_KEY!);export async function getFeatureFlags(userId: string, email: string) {await ldClient.waitForInitialization({ timeout: 5 });const context: LaunchDarkly.LDContext = {kind: "user",key: userId,email,};const newCheckout = await ldClient.variation("new-checkout-flow", context, false);const betaFeatures = await ldClient.variation("beta-features", context, false);return { newCheckout, betaFeatures };}
Seamless integration, great documentation. Set up in under 10 minutes.
2 days ago
Works well for our use case. Would love to see more webhook event types.
1 week ago
Excellent compliance coverage. HIPAA audit trail works perfectly.
2 weeks ago
| Key | Description | Example |
|---|---|---|
| LAUNCHDARKLY_SDK_KEY | Server-side SDK key for LaunchDarkly | sdk-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx |
LaunchDarkly is the industry-leading feature management platform that enables controlled feature releases with targeting rules, percentage rollouts, and experimentation. Its server-side SDKs evaluate flags locally with sub-millisecond latency, and real-time streaming ensures flag changes propagate instantly. Essential for teams practicing trunk-based development who want to separate deployment from release.